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UK 2017-53

Teretek® Re-levels and Supports Home Built on Sloping, Unstable Soil

Ground Improvement

The problem

Mainmark recommended Teretek®, its proprietary engineered resin injection solution, due to its ability to raise and re-level the structure in a prompt, non-invasive fashion so as to allow other trades to work around the methodology.

When a local investor purchased a two-storey home with the intention to renovate, the property was identified as experiencing severe subsidence. It had been constructed on a sloping site and the reclaimed ‘made’ ground had caused the home’s foundations to shift, most likely due to inadequate fill material or poor compaction. The structure stood on 1.5m deep strip footings and a suspended, reinforced concrete floor slab. Half of the home had subsided approximately 40mm, causing the wall of the house to separate from the foundation by approximately 20mm. Large cracks also began to form in the walls. The homeowner contracted Mainmark to help fix the issue by lifting the property back to level.

The Objectives

Mainmark was required to lift the home’s foundation by up to 43mm and the house by 20mm, returning it to its original level and reconnecting the wall with the foundation.

The project was to be completed within three days, without causing disruption to other trades carrying out ongoing renovation works on site. Access to the neighbouring property, via a narrow, shared driveway, needed to be maintained throughout the process.

The Solution

Teretek resins were injected between 1m and 4m below ground level, to fill the void which extended 1.8m long by 200mm deep, in a regular injection grid at constant centres of 50cm. This process enabled full coverage of material across the site footprint.

This noninvasive, environmentally-inert solution successfully returned the house to level and closed the cracks. Teretek’s unique formulation is fast-acting and costs a fraction of traditional underpinning and ground engineering methods. Mainmark was able to apply Teretek® while other renovation work was being completed, which was a great outcome for the homeowner who was able to maintain his schedule of works.

Teretek is a non-invasive ground improvement solution, likened to key-hole surgery, backed up by a 20-year product warranty. It increases ground bearing capacity, fills voids, and can mitigate soil liquefaction, all at a fraction of the cost of traditional underpinning and ground engineering methods, and with no detrimental effects on the environment. The ground improvement at the site was validated by a series of pre- and post-injection dynamic probing tests using a Dynamic Penetrometer system. Trained technicians established the average ground improvement delivered in the treatment zone by comparing pre-probing values to the post-probing values. The testing tool is a small, lightweight piece of equipment that can be used on sites that are inaccessible to other larger machinery. CCTV was used to carry out before and after pipe surveys to check the integrity of the existing drainage pipes and confirmed they were undamaged. The work was completed in 2 days. The client was pleased with the outcome, as well as the efficiency of the project delivery and its cost effectiveness. The homeowner commented, “I would like to thank you and your team for your very hard work last week, in the most atrocious weather conditions, to get the job done.”


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