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M61 Duckworth stabilisation

Challenge

Ground instability beneath sections of the M61 at Duckworth reduced support to carriageway infrastructure, requiring stabilisation without extended motorway closures.

Solution

Geobear delivered precision geopolymer injection to strengthen sub‑soils and restore load‑bearing capacity, completing works quickly within live motorway constraints.

Strategic motorway asset

M61 carriageway

In situ ground strengthening

No bulk excavation required

Live traffic environment

Minimal lane closures

Background

Sections of the M61 at Duckworth experienced ground instability caused by weakened or variable sub‑soils beneath the carriageway structure. Loss of uniform support posed risks to pavement performance and long‑term durability.
Given the motorway’s importance, maintaining traffic flow during remediation was essential.

Challenge

Traditional excavation and reconstruction would have required extended lane closures, complex traffic management and significant programme time.

A fast, controlled solution was required to improve soil strength and restore support without intrusive reconstruction.

Solutions

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

Small‑diameter injection points were drilled through the carriageway to introduce a two‑component geopolymer into weak zones. As the material expanded, it filled voids, compacted loose soils and increased stiffness, restoring consistent support.

Injection was monitored in real time to ensure precise control and avoid over‑lifting.

Results

Ground stability was restored without excavation or slab replacement.

The works were delivered efficiently within live motorway conditions, reducing disruption and providing a durable, lower‑carbon alternative to traditional repair methods.

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