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Kentish town slab track treatment

Challenge

Void formation beneath slab track at Kentish Town reduced support and risked track instability, requiring remediation within a live railway environment.

Solution

Geobear used precision geopolymer injection to fill voids and restore uniform support beneath the slab track, delivering rapid stabilisation with minimal rail disruption.

Rail infrastructure

Operational slab track system

Voids filled

Support restored beneath track

Minimal possession time

Works completed within rail constraints

Background

At Kentish Town, voids had developed beneath sections of slab track, leading to loss of uniform support and potential track movement. In a high‑traffic railway environment, maintaining stability and safety was critical.

The solution needed to be fast, controlled and suitable for delivery within restricted rail access windows.

Challenge

Traditional excavation or slab replacement would have required extended possessions and significant disruption to services.
A non‑intrusive method was required to restore support beneath the slab track without removing track components or affecting adjacent infrastructure.

Solutions

Geobear implemented a targeted geopolymer injection programme beneath the affected slab track areas.

Small‑diameter injection points allowed a two‑component geopolymer resin to be introduced beneath the slab. As the material expanded, it filled voids, compacted loose ground and re‑established continuous support.

Injection was carefully monitored in real time to ensure controlled lift and effective stabilisation within tight operational constraints.

Results

Uniform support was successfully restored beneath the slab track without excavation or track removal.

The works were completed within limited possession windows, minimising service disruption and providing a durable, lower‑carbon alternative to traditional reconstruction.

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