Homeowner Business Infrastructure Company 0800 084 3503

Void filling – Colt Cragg reservoir

Challenge

Subsurface voids beneath infrastructure at Colt Cragg Reservoir posed risks to stability and long‑term asset performance in a sensitive water management environment.

Solution

Geobear implemented precision geopolymer injection to fill voids and strengthen surrounding soils, restoring ground support quickly with minimal environmental disturbance.

Voids successfully filled

Subsurface instability mitigated

Infrastructure protected

Improved ground support achieved

Low environmental impact

No major excavation required

Background

Reservoir infrastructure relies on stable ground conditions to ensure safe and reliable operation.

Voids can form due to erosion, washout or historic ground conditions, increasing the risk of settlement and structural distress if left untreated.

In environmentally sensitive locations, intrusive repair methods are often unsuitable.

Challenge

Investigations identified voiding beneath parts of the reservoir infrastructure, raising concerns over ongoing erosion and potential structural movement.

A fast, controlled solution was required to stabilise the ground without extensive excavation or disruption to operations.

Solutions

Geobear designed a targeted geopolymer injection programme to fill the identified voids and densify surrounding soils.

The expanding resin restored uniform support and reduced further material loss.

Injection works were monitored in real time to ensure precise and controlled delivery.

Results

The voids were successfully filled and the ground stabilised, protecting the reservoir infrastructure from further settlement risk.

The solution provided a durable, low‑impact alternative to traditional excavation and replacement methods.

Ready to discuss your project?

Get in touch with our expert team today and discover how Geobear can extend the life of your critical infrastructure assets.

Contact us
Bear pointing Bear pointing