Report No. : GEO Report No. 277

Report Title : Report on the Landslide at Fu Yung Shan Tsuen of 20 August 2005 Findings of the Landslide Investigation (2013), 162 p. (Bilingual).

Author : Maunsell Geotechnical Services Ltd

Abstract

On 20 August 2005, a sizable landslide with a volume of about 400 m³ occurred on a hillside that has been disturbed locally by past human activities at Fu Yung Shan Tsuen, Tsuen Wan, resulting in one fatality. The landslide took place during a severe rainstorm with a return period of about 100 years. A comprehensive investigation into the landslide was carried out by Maunsell Geotechnical Services Limited, under consultancy Agreement No. CE 15/2004 (GE), for the Geotechnical Engineering Office. This investigation included review of documentary information, analysis of rainfall records, interviews with witnesses to the landslide, site survey, ground investigation, theoretical stability analyses and diagnosis of the causes of failure. The investigation concluded that the landslide was probably caused by the loss of soil suction and transient build-up of groundwater pressure in the near-surface materials following prolonged and intense rainfall.

Details of the investigation and its findings are presented in this report.

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