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P&S Consulting Engineers

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News » Lightweight Fill and Geogrids Solve Crossrail’s Stockley Airport Junction Problem

Crossrail is amongst the most significant infrastructure projects ever undertaken in the UK – from improving journey times across London, to easing congestion and offering better connections. Crossrail will deliver a high frequency, high capacity service to 40 stations linking Reading and Heathrow in the west, to Shenfield and Abbey Wood in the east via 21 km of new twin-bore tunnels under central London.
PaSCoE have provided a range of temporary works design services to the Crossrail scheme, the latest being the design of a temporary stop end wall to the Stockley Airport Junction Eastern Flyover.
Carillion Civil Engineering are constructing reinforced concrete troughs to support a new rail line with one of the troughs being filled with a lightweight aggregate fill (Leca). To facilitate the construction programme a temporary stop end is required on the Leca fill. Conventionally this would be achieved using a bund of conventional fill to restrain the light weight material, however due to the potential for differential settlement a solution was required that would utilise the Leca as the retaining structure. PaSCoE have designed a geogrid reinforced soil steep embankment to overcome the problem and have provided the Network Rail F002 and F003 approvals documentation for the works item.


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