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Voids beneath busy train track successfully filled

Challenge

Voids beneath a busy railway track threatened stability and safety, requiring urgent remediation without disrupting train services or excavating the track structure.

Solution

Geobear used precision geopolymer injection to fill voids and stabilise the sub‑base, restoring support quickly while maintaining full rail operations.

Live rail environment

No disruption to train services

Voids filled and stabilised

Track support restored

Rapid installation

Minimal plant and surface disturbance

Background

Void formation beneath railway infrastructure can occur due to washout, drainage issues or ground movement.

Loss of support beneath tracks increases the risk of settlement, alignment issues and long‑term maintenance challenges.

Traditional repair methods often require excavation and track possession, impacting rail schedules.

Challenge

Subsurface voiding was identified beneath an operational railway track, raising concerns about ongoing settlement and safety.

The remediation solution needed to be fast, precise and capable of being delivered within strict rail access constraints.

Solutions

Geobear designed a targeted geopolymer injection programme to fill voids and densify weak sub‑base materials.

The expanding resin restored uniform ground support beneath the track structure.

Works were carried out in controlled phases to maintain full rail operations.

Results

The voids were successfully filled and track stability restored without excavation or service interruption.

The solution reduced future maintenance risk and provided a durable, cost‑effective alternative to traditional track remediation methods.

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