Landslides (M25 at Godstone)

In December 2000 a major landslide occurred to the north of the M25 just east of junction 6. The movement mobilised about 90,000 m3 of the slope and closed the hard shoulder.

Geotechnical Observations has been monitoring the escarpment since November 2002. Since then we have installed inclinometers, including in-place inclinometers and ShapeArrays, and piezometers, including open standpipes, vibrating wire piezometers and flushable piezometers. Many of the instruments are now read remotely and the monitoring data is presented on our Geodaisy®.

We have also helped various operators to understand the behaviour of the slope and implement several remedial solutions. Our work continues and we are still providing monthly reports.