Copyhold Lane Cutting, a 200 m long and up to 30 m high slope flanking one section near Haywards Heath, had started to stir and required a permanent slope stabilisation scheme. The remediation design was to regrade the top bulge of the slope whilst maintaining a normal service on the lines below.
Tony Gee completed a stabilisation design that involved regrading the top half of the cutting, with workers removing 6000 tonnes of material in tandem with long reach excavators – taking the slope angle down from 50° the horizontal, to 30°.
Tony Gee was also asked to propose an alternative design for the lower slope soil nails. The new design used flexible anchors at a shallower angle from the face, allowing the rig masts to remain more upright.