Common Questions Answered: Drilling and Grouting FAQs

A stabilised soil bed supporting a pipe using the drilling and grouting technique for soil engineering and civil engineering purposes. The soil stabilisation is carried out by drilling and grouting contractors.

Drilling and grouting is a versatile technique used in soil engineering to achieve soil stabilisation. This blog explores the process of drilling and grouting in civil engineering, its significance in soil stabilisation, and the benefits it offers. Discover how Aarsleff Ground Engineering excels in the design and delivery of operational excellence through drilling and grouting, adding value to your projects.

Why is grouting important in soil engineering?

Voids beneath the ground pose risks to buildings and their foundations. Collapse of the ground above these voids can lead to crown-hole development and subsidence. Drilling and grouting helps mitigate these risks by bulk filling voids, preventing subsidence, and safeguarding structures and infrastructure.

How is Grouting done in civil engineering?

Drilling and grouting involves working along strategically spaced drilling points laid out on a grid. Using specialised equipment such as rigs and casing, you them drill below the voids. Grout is then injected to fill the void from the bottom to the surface through a flexible tube.

As industry leaders, Aarsleff Ground Engineering combine our design expertise, specialised plant, and skilled personnel to execute all types of drilling and grouting works. This combined approach is particularly versatile on projects related to abandoned mines and sites with weak soil, where drilling and grouting techniques prove especially beneficial.

What is Soil Stabilisation?

Soil stabilisation refers to the process of modifying soil properties to achieve long-term strength improvements. The quality of the base soil plays an integral role in the performance of foundations for any development. When necessary, drilling and grouting can be employed to remediate soil performance before further foundations are installed. This process has a rich history, dating back to ancient times. For more information on the history of grouting from the 19th century onwards, you can visit our dedicated page.

Why do you need to grout near mines?

With a rich coal mining heritage dating back to 1575, the UK experienced significant growth during the industrial revolution in the 18th century and subsequent development in the 19th and 20th centuries. However, due to a wide range of concerns including environmental, there has been a shift away from coal usage in the 21st century. The last of the 1,334 deep mines operational in 1952 closed in December 2015. Around 15% of the UK’s land has been impacted by mining activities, making land development challenging. The Coal Authority oversees development on former coal mining sites, ensuring safety and proper permits. Aarsleff has a wide range of experience and expertise in former coal sites, making us a choice contractor, combining skill and commitment to operational excellence.

What are the benefits of grouting?

  1. Maintenance-free solution for void filling
  2. Prevents collapse of granular soils and settlement under adjacent foundations
  3. Controls groundwater movement and protects utilities from damage
  4. Enhances soil strength, rigidity, and reduces ground movement
  5. Provides predictable degree of movement, critical for structural integrity
  6. Suitable for limited working spaces, offering designable strength and permeability


Drilling and grouting are versatile techniques in soil engineering and stabilisation. Aarsleff Ground Engineering’s commitment to operational excellence and value engineering ensures optimal results for your projects. Whether it’s for soil stabilisation, development on former mine sites, or any drilling and grouting requirements, contact us to discuss how we can add value to your scheme.

Get in Touch

A leading UK ground engineering specialist, focusing on multi-discipline excellence and value engineering. We design and deliver some of the UK’s largest ground engineering projects.

Our vision is to bring confidence to those constructing the landscape of tomorrow .

1947. Central Jutland, Denmark. Per Aarsleff borrowed 10,000 Danish Kroner from his father’s life insurance, bought an excavator, and founded Northern Europe’s leading contracting company.

Our biggest asset, our team is composed of the leading experts in ground engineering. Working with collaboration and cohesion at the core of our business, we can guarantee a quick and founded answer to all your questions.

We recruit and reward our people based on our ‘Step into the Blue’ company culture, where we embrace the core values of Life and Health, Trust, and Responsibility.

We do everything to ensure our team and yours work safely on our sites. With our core value of Life & Health, we see safety as a cultural pillar.

Our ISO accreditations are an assurance to you that we take governance seriously. Read our policies to discover more.

The projects that keep society running. Bridges, buildings, transit and rail facilities, embankment support, marine and offshore facilities, mines, airports, and water projects.

Keeping things turning. Sewage Treatment Works, Waste Water Treatment Works, Wind Farms and Wind Turbines, Biomass Plants, and Power stations.

Meeting society’s needs. Nursing and care homes, MOD buildings, Schools and Universities, and small or large-sized residential developments.

Staying on the move. Remediation, bridges, and foundation work are integral to keeping the industry running smoothly.

The landscape of the marketplace. Mega-retail sheds, distribution warehouses, University accommodation, and major supermarket and household name units.

Keeping things afloat. Ports and harbours, coastal defences, river embankments and inland waterways.

Technically trained estimators and a dedicated, in-house design team means we consider value-engineering at every stage of your project.

More than just a model, Visual Design & Construction is a tool to encourage collaboration and improve quality across all facets of a scheme.

From large commercial sheds to small residential plots, piling could be the foundation solution you need to support your project.

Issues around collapse, slipping or erosion? Our experts in retaining solutions have a broad portfolio of techniques designed to fix even the most nuanced of sites.

Tricky ground conditions or requirements? Aarsleff’s ground engineering team work on stabilisation through a varied range of techniques, bespoke to the properties of your site ground.

Our plant workshop offers a range of services designed to ensure your plant works for you. Whether it’s manufacturing and fabrication of equipment for long-term needs or hire so you can complete something specific.