ABSTRACT
A site in West Pennant Hills, Sydney, Australia, is to be subdivided for residential development. The site is located in an unstable hill slope. The Soil Conservation Service of New South Wales, Australia, indicates slope instability will impose major limitations on residential developments in the site. This chapter presents results of geotechnical investigation and slope stability analyses and provides recommendations on appropriate slope stabilization works to make the site suitable for residential development. Slope movements were observed to increase following rainfall events and rising of ground water levels. It should be noted that significant movements were not recorded in all the identified slip surfaces. Slope movements are taking place and likely to continue in some portions of the site, especially in domains geotechnical domains (GD) GD1 and GD3. Therefore, back analyses were carried out to assess probable strength parameters of shear zone materials.
