Design Of A Landslide Remediation Scheme For A 42 Lot Subdivision At Winston Hills, Sydney

A 42 lot subdivision proposed for a known landslip area at Buckleys Road Winston Hills required the geotechnical design of earthworks to remediate the site. An initial remediation proposal using an anchored retaining wall was abandoned in favour of an earthworks solution involving the removal of the failed material, installation of a drainage blanket and replacement of engineered fill. In order to reduce earthworks costs a alternative earthworks solution was also developed where only the sloping portions of the site were treated and the flatter central area was untreated. Detailed earthworks design included treatments at the site boundary where the landslip extends outside the site boundary, a foundation inspection and testing regime and earth bunds to deflect potential future failures from the neighbouring property.