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Ground Stabilisation: Building on Solid Foundations with Deep Soil Mixing Ltd

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In the world of construction, infrastructure, and land development, ground conditions are everything. Whether you’re working on a flood defence embankment, a road widening or new road scheme, or a brownfield redevelopment project, the ground must be stable, safe, and reliable.

This is where ground stabilisation becomes a critical part of the solution—and at Deep Soil Mixing Ltd, we’re proud to be leaders in the field, offering not only expert services but also free CPD-accredited seminars to share our knowledge with the industry.

What Is Ground Stabilisation?

Ground stabilisation refers to the process of improving the engineering properties of soil to make it more suitable for construction or long-term use. It typically involves increasing strength, reducing settlement, and enhancing bearing capacity—allowing the soil to support structures safely and efficiently.

Ground stabilisation is commonly required when working with:

  • Soft clays, peats, or silts
  • Poorly compacted fill
  • Contaminated or variable ground conditions
  • Flood-prone or waterlogged sites

Techniques Used in Ground Stabilisation

There are several techniques for stabilising ground, but one of the most effective, sustainable, and cost-efficient is soil mixing.

Deep Soil Mixing (DSM)

Deep Soil Mixing involves blending the in-situ soil with specially formulated binders to create a homogenous, solidified mass. This improves strength, stiffness, and durability—making it ideal for both geotechnical improvement and environmental remediation.

At Deep Soil Mixing Ltd, we offer soil mixing options to suit a wide range of site conditions and performance requirements.

Benefits of Ground Stabilisation with Soil Mixing

✅ Reduces Excavation – Minimal waste generation and no need for off-site disposal which with the recent increase in landfill tax is cost saving
✅ Improves Load-Bearing Capacity – Essential for supporting roads, embankments, buildings, and retaining walls
✅ Controls Groundwater – Helps reduce permeability and water ingress
✅ Cost-Effective – Faster than traditional piling and foundation methods
✅ Environmentally Friendly – Low carbon footprint and ideal for brownfield sites

Free CPD Seminars – Learn from the Experts

At Deep Soil Mixing Ltd, we’re passionate about sharing our expertise. That’s why we offer FREE CPDUK-accredited CPD seminars, designed to help engineers, consultants, developers, and local authorities understand ground stabilisation and soil mixing in more depth.

About Our CPD Seminars:

CPD UK-Accredited – Earn CPD points while expanding your knowledge
Flexible Format – Available in-person at your office or virtually
Comprehensive Content – Covers design, methodology, applications, case studies, and sustainability
Interactive Sessions – Ask questions, discuss projects, and gain practical insights

Whether you’re new to soil mixing or want a refresher on best practices, our seminars provide valuable knowledge tailored to real-world projects.

To book a free CPD seminar  email us at stephanie@deepsoilmixing.co.uk

Why Choose Deep Soil Mixing Ltd?

Deep Soil Mixing Ltd delivers innovative, sustainable, and proven solutions across the UK.

We work across a wide range of sectors including:

  • Transport infrastructure (roads, railways)
  • Flood protection and coastal defences
  • Brownfield regeneration
  • Housing
  • Reservoirs and canals
  • Commercial and industrial developments
  • Environmental/contaminated land remediation
  • Slope stabilisation

Whether you’re planning a project or looking to boost your technical understanding, Deep Soil Mixing Ltd is here to help.

Call us: 01525 643562
Email us: info@deepsoilmixing.co.uk

Visit: www.deepsoilmixing.co.uk

 

Ground Remediation Techniques: The Power of Soil Mixing

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When it comes to construction, infrastructure, or environmental projects, one thing is certain: the ground beneath our feet matters. In many cases, soils may be too weak, contaminated, or unstable to support new developments without proper intervention. This is where ground remediation techniques come into play—especially one of the most effective and sustainable methods available today: soil mixing.

What Is Ground Remediation?

Ground remediation refers to the process of improving or restoring the condition of soil to make it suitable for construction or to meet environmental standards. This could involve removing contaminants, stabilising loose materials, or improving load-bearing capacity.

Some of the most common reasons for ground remediation include:

  • Weak or compressible soils that cannot support structures
  • Contaminated land requiring treatment before redevelopment
  • Groundwater control to manage flow and quality
  • Environmental compliance in brownfield regeneration

Key Ground Remediation Techniques

There are several approaches to ground remediation, each suited to different soil conditions and project requirements. These include:

  1. Excavation and Replacement

One of the oldest methods, this involves removing poor-quality soil and replacing it with engineered fill. While effective, it is often costly and environmentally disruptive. Especially with the recent increase in landfill tax.

  1. Grouting

Grouting involves injecting materials into the ground to fill voids or solidify weak soils. It’s ideal for underpinning existing structures or treating soils beneath buildings.

  1. Vibro Compaction or Replacement

Used for granular soils, vibro techniques densify soil by using vibrating probes, improving strength and stability.

  1. Deep Soil Mixing (DSM)/Soil Stabilisation

Arguably the most versatile and cost-effective solution, deep soil mixing combines in-situ soil with binders to create a stable soil-cement matrix.

Why Choose Deep Soil Mixing?

At Deep Soil Mixing Ltd, we specialise in soil stabilisation solutions that are tailored to your project needs—whether it’s geotechnical improvement, environmental remediation, or foundation support.

Advantages of Deep Soil Mixing:

✅ Minimal Excavation – Ideal for sites with access restrictions or where reducing spoil is important
✅ Environmental Benefits – Reduces need for off-site disposal and minimises carbon footprint
✅ Cost-Efficient – Fewer lorry movements, quicker mobilisation, and less disruption
✅ Customisable – Mix design and depth can be adjusted based on soil type and performance goals
✅ Contaminated Land Remediation – Immobilises pollutants in-situ, preventing leaching and groundwater contamination

Applications of Soil Mixing

Soil mixing is suitable for a wide range of applications, including:

  • Basement and retaining wall construction
  • Flood defence embankments
  • Brownfield redevelopment
  • Rail and highway infrastructure
  • Landfill containment and capping
  • Foundation support in soft clays and peats
  • Slope Stabilisation

Partner with Deep Soil Mixing Ltd

At Deep Soil Mixing Ltd, we bring expertise, innovation, and technical knowledge to every project. Our team works across the UK to deliver reliable, sustainable, and cost-effective ground improvement solutions—backed by rigorous design and execution.

From feasibility studies to full design and delivery, we’re here to support your project from the ground up.

Ready to Discuss Your Ground Remediation Needs?

Call us on 01525 643562
Email: info@deepsoilmixing.co.uk
Visit: www.deepsoilmixing.co.uk

We also offer free CPD seminars on soil mixing/soil stabilisation.

 

Hike In Landfill Tax – Soil Mixing Is Sustainable Option

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Since 1 April 2025 Hazardous Landfill Tax Up By 22%  

The UK construction and development sectors are facing a massive hike in landfill tax, after an increase in April of 21.6% for hazardous waste and 23% for inert waste per tonne.

There has been a sharp rise in landfill tax year-on-year for more than a decade BUT this is the biggest increase to-date – and highlights the urgent need for greater sustainability in the industry with less reliance on hauling materials offsite and more reducing, reusing and recycling of waste through alternative methods such as soil mixing.

Tax Increase Means Businesses Will Pay £126.15 Per Tonne For Hazardous Waste

The Potential Impact On Businesses Is HUGE:

  • The standard rate for hazardous waste is up from £103.70 to £126.15 per tonne
  • The rate for inert waste is up from £3.30 to £4.05 per tonne

Deep Soil Mixing Ltd Can Help You Avoid The Higher Landfill Tax Costs!

Thanks to soil mixing, you can:

  • Reuse the existing ground, even if contaminated (any contaminants are locked in)
  • Cut construction costs and time
  • Achieve a lower carbon footprint for your project
  • Improved health and safety due to less vehicle movements on site and reduce transport associated carbon emissions by up to 96%
  • Ensure compliance with environmental regulations by adopting sustainable methods
  • Position your business as a leader in sustainable construction practices
  • Reduced Vibration: Soil Mixing induces very low vibrations, which reduces the potential impact to nearby The equipment does not exert any lateral pressure when mixing we can work as close as 200mm from the building/foundations

The REALLY GOOD News…

Soil stabilisation techniques can save you up to 50% compared to the cost of traditional methods of excavation and hauling materials offsite.

Get In Touch With Us Today

Deep Soil Mixing Ltd is an award-winning ground remediation specialist that can save you time and money and reduce your project’s carbon footprint.

Get in touch with us to see how we can help your business with your next construction project. Email Robert McGall – robert@deepsoilmixing.co.uk

 

 

 

 

Treatment of Landfill Sites and Contaminated Ground Using Soil Stabilisation

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The remediation of contaminated land including landfill sites through soil stabilisation ground remediation methods has demonstrated significant time efficiency and cost-effectiveness in mitigating contamination risks. It is crucial to note that this approach treats contaminants in situ.

By stabilising the soil through the incorporation of appropriate binders, which encapsulate the contaminants, soil mixing effectively prevents these harmful substances from adversely affecting the surrounding environment. This method has proven to be a successful strategy for addressing contaminated land.

Advantages of Soil Mixing/Soil Stabilisation

In contrast to other remediation techniques, soil stabilisation allows for the reuse of existing soil rather than necessitating the disposal of contaminated material and its replacement with new soil. Instead, the contaminated soil is mixed with appropriate binders to eliminate the risks it initially posed.

Disposal of contaminated soil typically incurs significantly higher costs compared to treatment, which offers cost and time certainties that are often prioritised by project managers.

Additional benefits of soil mixing include:

– Rapid achievement of results

– Effective treatment of persistent contaminants, such as heavy metals

– Applicability in situ so less vehicle movements on site improving environmental and health and safety.

– Enhancement of the structural properties of the soil

It is a cost-effective ground improvement method that offers energy efficiency and can be integrated into a wide range of construction projects, regardless of the existing soil conditions on-site.

Successful Projects

One project undertaken by Deep Soil Mixing involved a site that had contamination due to years of timber treatment which led to high levels of creosote in the soil, causing problems for neighbours and future development of the site. The remediation solution was centred around the in-situ soil mixing using particular binders that helped to neutralise the creosote and also aided future foundations through the soil stabilisation.

Another remediation of a contaminated site involved a new housing development which was on a brownfield site with historical contamination in one part of the site. The original plan was to cart off site and dispose in land fill.

Moving the problem from one location to another was both expensive and not environmentally friendly. Deep Soil Mixing Ltd was approached and able to mass mix the area, improving the geotechnical strength of the ground to enable the road to be built but also lock in the contaminants to reduce future leaching. This resulted in an environmental success and a huge cost saving for the client. We won an Institute of Highways Award for Sustainability on this project.

Soil mixing has also been effective in the treatment of landfill sites. Many landfill sites have previously been viewed as unviable for development due to their former use as a domestic and inert waste landfill. Using soil mixing as well as dealing with contamination, soil mixing also has the added value of being able to improve the physical engineering properties of the ground which offers a very cost-effective way of dealing with landfill sites, brownfield sites/marginal land in a single process.

Take a look at some of the other contaminated land projects we have undertaken here

Types of Soil Mixing

Soil mixing can be utilised in key applications for contaminated land including:

  • Stabilisation – involves altering the properties of the soil to mitigate contamination risks.
  • Solidification – immobilisation and treatment of organic and inorganic contaminants
  • Impermeable cut-off walls – containment of contaminants within an identified area of pollution
  • Permeable reactive barriers (PRB’s) – for treatment of contaminated

ground water

These methods utilise agents to bind and enhance the contaminated soil.

 Soil Mixing Binders/Agents

The choice of agent or binder for treating contaminated soil is influenced by several factors, including:

– pH levels

– Type of contaminant

– Soil characteristics

– Desired target reduction

Treatability Study

The cornerstone of successful remediation through soil mixing lies in selecting the appropriate binder. This process requires time and a thorough trial period to identify the optimal solution.

Contaminants Addressed by Soil Mixing

Soil mixing techniques are effective in treating a variety of contaminants, including:

– Asbestos

– Inorganic corrosives

– Metals

– Metalloids

– Solid organics, such as plastics and resins

– Inorganic cyanides

– Polychlorinated biphenyls (PCBs)

– Polycyclic aromatic hydrocarbons (PAHs)

Deep Soil Mixing Ltd: Your Partner in Remediation

Each contaminated site presents unique challenges, necessitating tailored remediation solutions. These solutions are meticulously designed to consider the specific site conditions and the characteristics of the contamination. A comprehensive approach is employed, incorporating laboratory tests, field trials, and ongoing monitoring throughout the implementation of the soil mixing remediation works.

If you have a specific site or project in mind, we invite you to consult with us to identify the ideal solution. From assessing the contaminants present in the site soil and ensuring quality control during laboratory testing to selecting the appropriate binder and overseeing the application in situ or ex situ, we are committed to achieving the objectives of your soil mixing project.

Innovative First For Soil Mixing Enabling Construction Of Gull Wing Bridge In Lowestoft

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Innovative First For Soil Mixing Enabling Construction Of Gull Wing Bridge In Lowestoft

Environmentally friendly solution deep soil mixing was recently used on the new Gull Wing Bridge in Lowestoft by Deep Soil Mixing Ltd who recently carried out soil mixing solutions for client Farrans, to stabilise the site ground and ensure the successful completion of the project.

Deep Soil Mixing Ltd was responsible for improving the strength, condition and stability of the soil on the northern approach to the new Gull Wing Bridge, to ensure its load bearing quality, this was achieved with the native soils through a combination of mass mixing and the installation of Soil Mixed Columns (SMCs).

Specified for its environmental qualities the soil mixing solution meant none of the existing site soil was excavated and removed from the site thus reducing the carbon footprint of the project and saving on time and costs.  It also aided Health and Safety as there were less vehicle movements on site.

The ground was mass mixed to depths of 2 metres and soil mixed columns were installed to depths of 7 metres. Using Deep Soil Mixing Ltd’s double rotary mixing head that rotates in two directions to provide homogeneous mixed ground. This enabled greater accuracy of mixing to improve efficiency and cut costs for Farrans compared to using the industry standard of a single auger mixing head.

As part of the soil mixing solution, Deep Soil Mixing Ltd created bridge abutments to improve the load bearing pressure of the ground and resolve any contamination in the ground. The process involved raising the embankment soils by approximately 5.5 metres above the existing ground and using this soil heap to mix a 5-metre mattress above ground level. Soil mixed columns were installed within 50mm of water assets, which meant ensuring a 1 metre gap between the teeth of the rotary mixing head. The rotary was then reduced to 900mm in diameter before the ground was mass mixed to within 1 metre of the crown of the assets.

The soil mixed columns were installed through the soil mixed mattress, ensuring the binding of the columns into the platform turned it into the transfer mattress between the soil mixed column layout. This innovative solution was a first in the UK and enabled testing to be carried out to prove there was no punching of the soil mixed columns.

The mix of mass mixing and soil mixed columns provided the necessary support to the northern approach embankment and enabled the bridge to be built once the soil mixing phase had been completed.

 

The Benefits Of Deep Soil Mixing VS Traditional Ground Improvement Methods

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The construction industry relies heavily on ground improvement techniques to improve soil properties, immobilise contaminants in the ground, improve the bearing capacity and enable the achievement of endless project goals within this vibrant sector as ground is stabilised for construction. Without these methods, the construction sector would be massively restrained and restricted.

With the recent announements from Chancellor Rachel Reeves, that 1.5 million homes need to be built on brownfield and greyfield sites over the next five years, the need for more sustainable and cost effective ground improvement solutions becomes critical. In 2024 we should not be excavating and removing material from site to landfill. This is just moving the problem elsewhere. We should be treating the soil in-situ.

So which method is best?

Undoubtedly, every ground improvement technique has its own strengths and weaknesses. However, the method of deep soil mixing whether mass mixing or incorporating soil mixed columns in construction developments provides many more advantages compared to the more traditional ground improvement choices.

Advantages of Deep Soil Mixing

Mass soil mixing and column mixing provide flexibility as they increase bearing capacity, immobilise contaminates, stabilise, and alter the properties of soil and, as a result, can be used for numerous purposes. From enabling weak soil to be improved for use in foundation work through to containing and reusing contaminated land for various purposes, soil mixing has numerous advantages.

Advantages of deep soil mixing include:

  • Reduced construction time
    Little or no excavation of soil is needed as most soil classifications are mixed to the required depth and with the tested binder to create the desired consistency for the project.
  • Reduced costs
    The method is efficient and effective, keeping overall construction costs down.
  • Reduced carbon footprint
    Soil mixing is better for the environment as no soil has to be taken off-site using large vehicles and equipment, cutting down on the energy expenditure of the work and its carbon impact. As the soil is mixed for improvement rather than replaced, there is minimal spoil or wastage.
  • Soil mixing is also excellent for stabilising peat.
  • Improved health and safety – With soil mixing there are less vehicle movements on site and surrounding roads this therefore vastly improves health and safety on site.
  • Reduced Vibration: Soil Mixing induces very low vibrations and thus reduced noise, which reduces the potential impact to nearby utilities and buildings. The equipment does not exert any lateral pressure when mixing so we can work  close to building/foundations.
  • Diverse applications
    All sorts of soils can be treated, including flood plains, contaminated land, peat, silts and alluvium.
  • Diverse purposes
    Soil mixing helps with a wide range of projects, from increasing bearing pressure and controlling settlement through to cutting permeability and treating contaminated ground.

Examples Of Soil Mixing Projects

To demonstrate the variety of construction projects soil mixing can assist with, these are just some examples of what soil mixing has been used for:

  • Ground improvement and settlement reduction for factory developments, retail parks and roads.
  • Stabilisation of embankments for gas mains, water pipes, sewers, etc
  • Stabilisation of retaining walls
  • Strengthening of impermeable cut-off walls such as canal walls and cofferdams
  • Implementation of permeable reactive barriers to treat contaminated ground
  • Limitation of vibration using soil mixed barriers that reduce frequency transfer.

Soil Mixing: Quality Control

The outstanding results that soil mixing achieves is thanks to the rigorous quality control measures in place every time.

There is always extensive laboratory testing carried out on each site to ensure the right binder is used for mass soil mixing, depending on the desired outcome of consistency needed.

Furthermore, when it comes to soil mixed column installation, for each column a detailed log is provided that documents tool diameter, mixing depth, rotation speed, binder type, binder input flow rate and rotation velocities, to make sure the work is conducted in a consistent and verifiable manner for optimum results.

Soil mixing is a cost-effective ground improvement method that comes with the additional benefits of energy efficiency and the ability to be incorporated into a wealth of construction projects – no matter the existing state of the soil composition or classification.

This is a video of a piling rig in operation and then a soil mixing rig in operation you will be able to listen to how much quieter soil mixing is.

Deep Soil Mixing Ltd is an award-winning ground remediation specialist providing an in-situ soil improvement solution service to the construction industry. With a proven track-record of soil stabilisation through mass mixing and column mixing, we can help with all kinds of ground improvement works to transform even the poorest or most contaminated land into ideal sites that are ready for development.

 

 

 

How do I learn more about soil stabilisation services?

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If you would you like to learn more about soil mixing or soil stabilisation a ground improvement solution that remediates poor ground in situ and is an alternative to consider when you are looking at piling, excavate and cart away, dynamic compaction, surcharge etc., you can attend one of our CPD UK accredited CPD seminars on soil mixing.

Learning more about soil mixing may be relevant if you have any forthcoming construction projects that have poor quality ground and need remediating but the costs to remove the contamination or poor quality site soil is prohibitive, or the cost of piling is also proving a barrier.

Using binders for various applications we carry out soil mixing of the existing site soils to either produce large diameter stabilised columns, mass mixing for full depth treatment, mass mixing over the top of the columns to provide a transfer mattress, trench mixing to provide cut-off walls or even PRB walls, we do not remove materials from site, this has significant advantages of reducing CO2 emissions, improves site safety with less vehicle movements, improves sustainability and is recycling on a grand scale.

Soil mixing also reduces project times and costs as well as your carbon footprint on construction projects compared to other more traditional ground engineering methods. You are treating the ground in-situ and will not incur costly excavate and cart away charges.

So why consider soil stabilisation services for your projects over other more traditional ground remediation methods::

  • Reduces construction programme
  • No need to excavate and cart away
  • Less vehicle movements on site so improves health and safety
  • Zero vibration during construction
  • Minimal spoil removal
  • Wide range of soils can be treated compared to other solutions
  • Soil can be used as construction material
  • No need to bring costly and bulky materials on site
  • Environmental – Reduction of Carbon Footprint
  • Effective on different soils, including soft soils, flood plains, contaminated land, peat, silts and alluvium etc.
  • Increases bearing pressure, controls settlement and reduces permeability

During the CPD seminar we explain how soil mixing technology has helped on several projects over the last few years from road construction and bridge abutements through to dealing with contaminated and poor-quality ground, flood alleviation and slope stabilisation.

Deep Soil Mixing Ltd has undertaken a wide variety of projects including large infrastructure projects such as the Mersey Gateway and HS2 through to a wide variety of other projects from housing through to retail developments and have practical experience in the design and construction in all of the following soil mixed solutions.

  • Ground improvement to reduce settlement: factory developments, retail parks, roads, car parks, wind turbines sites
  • Shear stabilisation of embankments: railways, rivers, roads
  • Stabilised corridors: for installation of services: sewers, pumping mains, water pipes, gas mains
  • Retaining walls: cantilevered, mass fill, and king posts
  • Impermeable cut-off walls: flood embankments, canal walls and bases, cofferdams, containment of contaminants within an identified area of pollution
  • Permeable reactive barriers (PRB’s): for treatment of contaminated ground water
  • Stabilisation of contaminated ground: locking in contaminants in a mass mixed operation
  • Vibration control: soil mixed barriers installed to reduce the transfer of irritating vibrations, i.e. railways, industrial factories, construction operations

If you think this is something your team would be interested in learning more about contact us now or email Stephanie Freeman on stephanie@deepsoilmixing.co.uk .

Deep Soil Mixing Ltd Starts 2024 With New Staff Members

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Deep Soil Mixing Ltd has started 2024 as it means to go on – with the recruitment of 3 new members of staff to join its expanding team of soil mixing specialists and help manage the upcoming and ongoing projects across the UK.

The soil stabilisation and ground improvement specialist contractor has recently employed Seb Salt as Apprentice Plant Engineer, Dalia Jaisan as Geotechnical Laboratory Technician, and Dean Hill as Assistant Project Manager.

“It is a great way to start a New Year, we are pleased to be further expanding the team at Deep Soil Mixing. We are starting several new projects in the first quarter and need to bring in new employees to strengthen the team. In order for the company to grow, it is important that new people are keen to learn the soil mixing procedures and all our new starts have essential roles to fill,” says Robert McGall, Managing Director of Deep Soil Mixing Ltd.

“We are delighted to have Seb, Dalia and Dean join our team – and look forward to a successful year of soil mixing projects.”

As Apprentice Plant Engineer, Seb Salt is based at the company’s Stafford plant yard. He splits his time between being on site and studying at Stafford College for an apprenticeship course in Land-Based Service Engineering.

He says: “I feel lucky to have this opportunity to progress with my studies and gain practical experience. As Apprentice Plant Engineer I’m going to learn so much from my colleagues and manager, who’ve been so welcoming. Although I’m new to the role, I’m already really enjoying it and looking forward to getting to grips with it all.”

Dalia Jaisan is an experienced civil engineer and is Deep Soil Mixing Ltd’s new Geotechnical Laboratory Technician. Based at the company’s head office in Bedfordshire, she carries out testing of site samples, collecting the soils from various construction sites to test back in the laboratory.

“I’m already loving my new job – as well as testing soil samples in our laboratory at head office, I oversee all related activities to ensure that the testing is performed efficiently and quickly,” says Dalia.

Based on site, Dean Hill is Assistant Project Manager and is working alongside Site Manager Ash Critchlow. His role involves handling all on-site paperwork, drawings and plans with the principal contractor, project managers and engineers to keep progress on schedule, and ensuring the work taking place at the site runs smoothly.

“It’s such a varied role,” comments Dean.

“No two days are the same, which makes it really enjoyable – some days I’m going through the project plans with everyone while others I’m outlining the cell and column installations required or assisting with the health and safety management on site. It’s challenging and rewarding in equal measures, and it’s great to work alongside and learn from Ash and the Deep Soil Mixing team too.”

Deep Soil Mixing Ltd is one of the UK’s leading soil mixing specialists with experience in successfully completing projects for the stabilisation of embankments, ground improvement and soil stabilisation for the construction of retail parks and roads, and stabilisation of soil for corridors for services installation as well as stabilisation of contaminated ground.

“With multiple uses and benefits of soil mixing, it makes sense to expand our team and grow our business,” explains Robert McGall, company MD.

“We believe soil mixing will become the standard practice in the next few years, which is why we’re investing in our people and resources now. We want to expand its use in the UK especially as we should be looking at more sustainable construction solutions – and we need a great team to be able to do so.

“We couldn’t be happier with Seb, Dalia and Dean joining us. We have many new projects starting in 2024, including projects in Norfolk and Sussex, as well as ongoing projects in London, so it’s fantastic to have more talented individuals helping us complete our projects successfully and enabling us to expand the business.”

We have made the GE Awards 2023 Shortlist

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Deep Soil Mixing Ltd has shortlisted for the Ground Engineering awards 2023.

The awards which are now in their 15th year and the winners will be announced at a gala evening at the JW Marriott Grosvenor House Hotel in London, on the 12th July 2023.

We have been shortlisted in the category:

UK Project with a geotechnical value up to £500K

Along with our project partners, JBA Bentley, we entered the Clementhorpe Flood Alleviation scheme, into this category.

York has been prone to flooding and in 2015, Government allocated £45m to the Environment Agency (EA) to protect 2,000 homes in the city, 135 of which in the Cell B8 Clementhorpe scheme.

In Jan 2023 river levels rose but the Clementhorpe area was saved from flooding due to a £7.7m flood defence scheme which completed in 2022. A major part of this included the innovative use of Deep Soil Mixing’s soil mixed underground seepage mitigation barrier, a solution that has not been used before for flood defence schemes in the UK.

The use of soil mixing on this project is a prime example of how innovation in ground engineering, sustainability and value engineering together with collaborative working with stakeholders including the EA, the Local Authority and Contractors JBA Bentley can be beneficial to not only one project but also has the potential to change flood defence work going forward.

JBA Bentley were initially looking at using secant piled walls, but this was cost prohibitive for the project. Deep Soil Mixing were approached and in collaboration with JBA Bentley an underground seepage mitigation barrier using ‘soil mixing’ was proposed. This was designed to make the ground semi-impermeable. By using soil mixing, our solution was both sustainable and cost-efficient.

Our soil mixing solution comprised a cut-off wall constructed with secant columns 5-6metres below ground, adjacent to apartments. It created a semi-impermeable barrier underground to stop the flood waters from seeping through the ground and passing underneath the above-ground flood defences.

Working with JBA Bentley prior to starting on site, Deep Soil Mixing conducted trials to find the right mix and quantity of binder and soil, to ensure specific compressive strength qualities and semi-impermeability were achieved.

Spending time with the Bentley’s prior to start on site and liaising with the Environment Agency, local councillors and residents to keep them abreast of the project proved invaluable.

The soil mixing solution implemented by Deep Soil Mixing was designed to a critical permeability factor to allow landside water to mitigate back to the river from the surrounds whilst at the same time not allowing flood waters into the homes. This involved mixing a binder into the existing ground using our double rotary mixing head mounted onto a rig to create an underground flood defence, 240 metres long and up to 6 metres deep.

The purpose-built double rotary mixing head has twin paddles that move in opposite directions to achieve the greatest soil distribution as the materials are mixed. Improving the soil mixing process enabled the mix designs to be more finely tuned and accurate, increasing both efficiency and costs benefits for the client over the industry norm of a single auger mixing head.

Unlike piling, soil mixing has zero vibration which given the close working proximity of homes combined with reduced material deliveries and plant movements minimised disruption to the homes. Utilising the existing ground also reduced disposal of material off site, reduced import and significantly lowered the carbon footprint.

Rob Culledge, JBA Bentley Contracts Manager, said,

“Deep Soil Mixing collaboratively consulted during the design phase, going above and beyond requirements, carrying out numerous site visits in advance of the works, to plan in detail the temporary works, programme of installation and health and safety requirements all resulting in the scheme being delivered safely, ahead of programme and to budget.”

Colin Critchlow Associate Director at Deep Soil Mixing Ltd, comments:

“To be shortlisted for this year’s awards is fantastic recognition of the work we have undertaken at York in partnership with JBA Bentley and a great endorsement of the hard work by the Deep Soil Mixing team. Plus, recognition for innovative ground engineering solutions like soil mixing. We are now looking forward to the awards evening in July.”

Deep Soil Mixing Ltd Achieve ISO 9001 & 14001

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Ground remediation and soil stabilisation contractor, Deep Soil Mixing Ltd has achieved certification to two key international business standards – ISO 9001 Standard for Quality Management & ISO 14001 for Environmental Management.

This independent assessment demonstrates Deep Soil Mixing Ltd’s commitment to customer service and quality in delivery as well as ensuring environmental management is top of their agenda.

Deep Soil Mixing Ltd’s Safety, Health, Environmental and Quality (SHEQ) Manager Oliver Hopgood says: “Certification has provided us with a robust framework within which we manage our quality and environmental systems. Achieving ISO 9001 certification shows our commitment to quality, customers, and a willingness to work towards improving efficiency.

It demonstrates the existence of an effective quality management system that satisfies the demands of an independent, external audit.

The ISO 14001 standard specify the requirements for an environmental management system that is used to enhance our environmental performance. It allows us to recognise and understand our environmental aspects and impacts so that we can manage our environmental responsibilities in an organised way, therefore contributing to environmental sustainability.  We care not only about delivering an excellent service but also the impact that we as a company and they as individuals have on the environment.  The soil stabilisation and ground remediation solutions of soil mixing that we employ are environmentally friendly and reduce carbon footprint substantially for all the projects we have undertaken.”

He adds: “The ISO accreditation confirms our status as a company capable of internationally recognised standards and we are pleased that our dedication to excellent customer service has been recognised by ISO.  Our clients demand an effective Quality Management System, which gives them the confidence that our products and services will be delivered to exacting standards.

This ISO certification also supports Deep Soil Mixing Ltd’s corporate objectives, while reinforcing a culture of excellence. As Deep Soil Mixing Ltd continues to expand, the ISO quality framework will also assure customers that they will continue to receive the highest quality products and consistent service.  We are therefore rightfully proud of this award and the work that’s gone in to achieving it. In 2018 Deep Soil Mixing will be working towards ISO 45001 – Occupational health and safety.”

Achieving ISO 9001 & 14001 comes at the end of a fantastic year of exciting contracts from a slope stabilisation project in West Yorkshire, a mass mixing soil stabilisation project in Carlisle, a mass mixing project in Lewisham and also seeing the opening of the Mersey Gateway Crossing for which Deep Soil Mixing Ltd installed over 1000 soil mixed panels.

CONTACT US

+44 (0) 1525 643562

Robert McGall
07979 533 925

Matthew McGall
07814 661497

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