Challenge
Construction of a new sewer beneath a live motorway required ground improvement to ensure stability and load performance without disrupting traffic or compromising safety.
Solution
Geobear delivered targeted geopolymer injection to strengthen soils around the sewer alignment, improving bearing capacity and maintaining motorway integrity during and after installation.
Works delivered under traffic constraints
Support to new sewer alignment
Minimal impact on programme
A new sewer installation beneath a motorway required assurance that surrounding ground conditions could safely support both the pipeline and overlying traffic loads.
Weak or variable soils presented a potential risk to long‑term performance, making ground improvement a critical element of the scheme.
Traditional ground replacement or large‑scale stabilisation would have introduced programme delays, significant excavation and potential disruption to motorway operations.
A precise, low‑impact solution was required to improve soil strength in situ while maintaining safety and traffic flow.
Geobear designed a controlled geopolymer injection programme to enhance soil stiffness and bearing capacity along the sewer alignment.
Small‑diameter injection tubes were installed to introduce a two‑component geopolymer into targeted zones. The material expanded on mixing, filling voids, binding loose soils and increasing load‑bearing performance.
Injection parameters were carefully managed to ensure uniform improvement while protecting both the new sewer and the motorway structure above.
Ground performance was enhanced, providing long‑term stability for the sewer installation and overlying carriageway.
The works were completed efficiently within a live motorway environment, delivering a durable and lower‑carbon alternative to traditional stabilisation methods.
Get in touch with our expert team today and discover how Geobear can extend the life of your critical infrastructure assets.