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Motorway slope stabilisation work nears completed

The Highways Agency hopes that the long term stability of an embankment on a slip road from the M5 has been secured as work on electrokinetic treatment of the slope comes to a close.

Amey has worked with Electrokinetic and Geotechnical Engineering on the 265m long embankment at junction 7over the last five months in a bid to return the 26° to 29° slope to stability. The work follows on from similar stabilisation of an embankment on the A21 (GE, March 2012) for which Electronkinetic has won several awards.

Slips in the M5 embankment, which is formed from a core as reworked Lower Lias Clay, overlain by a mantle of variable reworked Mercia Mudstone, glacial or terrace deposits, were first recorded in 1999. Monitoring showed continued movement and potential for deep seated failure so Amey proposed stabilisation using electrokinetics as more cost effective and environmentally friendly than other options.

Despite the work being carried out during the wettest April and June on record, initial monitoring suggests the work, which will be completed at the end of July, has been successful.

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