Stability for the London Rail

The use of Leca® Lightweight Aggregate provides the solution for a 200m London Rail embankment with limited access on a busy rail line.



Leca Lightweight Expanded Clay Aggregate within Construction and Civil Engineering projects

Engineers for Transport for London were tasked with providing the structural stability and lightweight solution for one of the busiest rail lines in London. Leca® Lightweight Expanded Clay Aggregate was installed as a lightweight backfill which was placed within a RAM WALL system, stabilising the embankment walls along a 200m stretch of the Acton Town to Chiswick Park London Underground.

Embankment Instability

Phil Richardson of Innovative Support Systems Ltd. explains that “Deterioration of the embankment was compromising the stability of the wall and it was deemed necessary to re-grade the slope to reduce and transfer weight directly above whilst at the same time creating a walk way to access the line-side services.”

Under Pressure

The problem facing the Transport for London was that the railway embankment was situated directly behind residential property in a busy area of London and alternative aggregate was proving to be dangerously problematic due to the heavyweight pressure – causing potential major long term structural issues. Leca® Lightweight Expanded Clay Aggregate fundamental lightweight properties solved this issue with ease.

“In order to accomplish this in an exceptionally constrained site with very limited access. RAM WALL was used alongside Leca® Lightweight Expanded Clay Aggregate which was selected because of its ability to be constructed in difficult locations to a variable geometry.” Explains Phil Richardson of Innovative Support Systems UK.

Thanks to Leca® Lightweight Expanded Clay Aggregate’s free draining and lightweight nature, the facility to be pneumatically delivered, and the ability to also be delivered in small lightweight bags – Leca® Lightweight Expanded Clay Aggregate provided the perfect innovation and solution to this rail issue.