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GEO Report No. 241
Report No. : GEO Report No. 241

Report Title : Review of the 22 August 2005 Landslide on the Natural Hillside above Slope No. 7SW-D/C2 at Lion Rock Tunnel Road, Sha Tin (2009), 76 p.

Author : Maunsell Geotechnical Services Limited

Abstract

This report presents the findings of a review of a landslide (Incident No. 2005/08/0428) that occurred on a natural hillside above slope No. 7SW-D/C2 along Lion Rock Tunnel Road, Sha Tin. The landslide was reported on the afternoon of 22 August 2005 following heavy rainfall on 19 and 20 August 2005.

The landslide involved a failure volume of about 400 m3. Much of the debris was deposited within 40 m of the source, with a small proportion of the debris travelling a total distance of about 80 m downslope from the source. Outwash from the landslide debris travelled to the crest of slope No. 7SW-D/C2 and spilled over onto Lion Rock Tunnel Road. One lane of the southbound carriageway of Lion Rock Tunnel Road was closed for three days as a result of the landslide.

The key objectives of this review were to document the facts about the landslide, including relevant background information and pertinent site observations made under this review. The scope of the review does not include any ground investigation or detailed diagnosis of the causes of the incident. Recommendations for follow-up actions are reported separately.


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