A private road, crucial for local residences, faced a significant structural threat. Scour from a stream had eroded the soil beneath a gabion basket wall’s concrete slab, creating a potentially dangerous void. The void, a direct result of scour, posed an immediate risk to the structural integrity of the wall. While temporary measures like sandbags were in place, a permanent, swift solution was urgently required.
In response to the client’s needs, Mainmark proposed to fill the void with their advanced geopolymer technology. The treatment area spanned approximately ten linear meters, with the void extending up to 1.2 meters from the slab’s edge and a depth ranging between 200mm to 300mm, resulting in a maximum estimated void volume of 2m³.
The task involved deploying Mainmark’s specialised technique:
- Inserting 16mm diameter injection lances through gaps in the sandbag wall at intervals of around 1 meter.
- Carefully injecting geopolymer through each lance, ensuring the material filled the void completely. This was verified when geopolymer emerged through the gaps or became visible at the next interval.
- Continuous monitoring of the water levels was essential to identify optimal times for the geopolymer injection.
- Potential movement of the sandbags during geopolymer injection was anticipated and managed accordingly.
The project was executed with precision, effectively filling the void and reinstating the stability of the gabion basket wall. Mainmark’s approach, characterised by efficiency and minimal environmental disruption, provided a robust solution to a complex erosion problem, demonstrating their expertise in ground engineering solutions for challenging environments.
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Mainmark Ground Engineering (UK) Ltd.