March 9, 2023
Mainmark Ground Engineering Provides Non-Invasive Subsidence Solutions

Mainmark Ground Engineering specializes in non-invasive and cost-effective solutions for subsidence repair and ground improvement. The company provides a range of specialist products for the residential, commercial and industrial sectors.

Their team recently won the International Project of the Year Award at the Ground Engineering Awards for their work in re-levelling the Christchurch Art Gallery after earthquake damage occurred. This was a landmark project for Mainmark and the industry, setting a new benchmark in earthquake remediation for large scale buildings.

Resin Injection

Resin Injection is a more modern, less invasive and more affordable solution for foundation repair. It also doesn’t require excavation, minimizing disruption to a building or its inhabitants.

Teretek resin is injected through small holes into the ground beneath footings and then expands by chemical reaction. This process increases ground bearing capacity, fills voids and mitigates soil liquefaction.

It’s a tried and tested world-wide method for strengthening foundations and protecting the future of your property. Mainmark’s technicians select a number of injection points under the structure in a similar process to keyhole surgery, and then insert a Teretek expanding polyurethane resin mix into these points.

The Teretek system has been designed to increase liquefaction resistance and stiffen shallower ground beneath existing structures by densifying the soil, and it’s a proven, cost-effective, environmentally friendly and low-impact solution for re-levelling buildings and improving the safety of underground infrastructure. It’s also a peer reviewed method of seismic liquefaction mitigation.

JOG Computer-Controlled Grouting

JOG Computer-Controlled Grouting is a highly advanced process of multi-point, cementitious levelling of large and complex structures by computer-controlled equipment. A high pressure, low volume computer-controlled grout pump circulates cementitious grout to as many as 128 injection points in the quantity required at the moment it is needed.

Using this technology, Mainmark Ground Engineering successfully re-levelled the Te Puna o Waiwhetu Art Gallery in Christchurch. The gallery was heavily damaged in the 2011 earthquake and was unable to function for some time.

To address the subsidence, the ground beneath the gallery’s foundations was strengthened by jet grouting. Then, JOG was used to gently lift the building back onto its foundations. This allowed the gallery to reopen for business after nine months.


Terefil is a highly-flowable, lightweight concrete grout mix that can be pumped into large voids and holes. It is an ideal solution for when site access is limited or project schedules are tight. It is often used to backfill load bearing retaining walls, fill voids and sinkholes, abandon pipes and shafts, landslip repair, and more.

Using Terefil, Mainmark Ground Engineering has been able to repair the Toowoomba Bypass in a timely and cost-effective manner. It also helped the bypass to reach industry compliance standards set by the Queensland Department of Transport and Main Roads.

In addition to its extensive range of products and solutions, Mainmark Ground Engineering has a service location team that uses cutting-edge tools and technology to accurately locate underground services and assets before any excavation begins. This helps to avoid significant hazards, project delays and financial implications.

Subsidence Repair

Subsidence is one of the most common structural issues affecting property owners, especially when there is an extended period of dry weather. Cohesive soils, such as clay and silt, shrink when exposed to long periods of moisture loss.

Drainage problems such as leaks or broken pipes can also cause subsidence. The water in these types of drains can make the ground beneath softer and weaken it, eventually causing foundations to sink.

If you are concerned that your property may have subsidence, speak to a specialist at Mainmark Ground Engineering. They will be able to help you identify the most cost-effective solution.

Often, the underlying cause of subsidence can be resolved without needing foundation work. For example, removing trees that are close to your building or fixing a leak can stop the problem from getting worse.

However, if the problem is more severe, foundation work may be needed. Whether the repair is required depends on how extensive the subsidence is and how quickly it can be fixed.

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