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Tunstall Reservoir, County Durham – void filling

Challenge

Voids were identified beneath infrastructure at Tunstall Reservoir, posing risks to structural stability and long‑term asset performance in a sensitive water management environment.

Solution

Geobear delivered precision geopolymer injection to fill subsurface voids, stabilise surrounding ground and restore uniform support with minimal environmental disturbance.

Voids filled

Subsurface instability mitigated

Infrastructure protected

Structural integrity maintained

Low environmental impact

Minimal disruption to operations

Background

Reservoir infrastructure must maintain long‑term stability to ensure operational safety and water management performance.

Subsurface voids can develop due to washout, erosion or ground movement, increasing the risk of settlement and structural distress.

Sensitive environments require carefully controlled intervention methods.

Challenge

Ground investigations identified voiding beneath parts of the reservoir infrastructure, raising concerns about ongoing erosion and potential structural movement.

A solution was needed that would stabilise the ground quickly while avoiding excavation and limiting environmental impact.

Solutions

Geobear designed a targeted geopolymer injection programme to fill voids and improve ground stiffness beneath the affected areas.

The expanding resin permeated cavities, restoring uniform support and preventing further material loss.

Injection was carefully monitored to ensure controlled delivery.

Results

The voids were successfully filled and the surrounding ground stabilised without major construction works.

The reservoir infrastructure was protected with a durable, efficient solution that maintained operational continuity.

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