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GEO Report No. 108
Report No. : GEO Report No. 108

Report Title : Investigation of Some Selected Landslides in 1998 (Volume 1) (2001), 175 p.

Author : Fugro Scott Wilson Joint Venture

Abstract

This GEO Report consists of three Landslide Study Reports on the investigation of selected slope failures that occurred in 1998. The investigations were carried out by Fugro Scott Wilson Joint Venture (FSW) for the Geotechnical Engineering Office as part of the 1998 Landslide Investigation Consultancy.

Section 1 of the report presents the findings of a detailed study of the landslide (GEO Incident No. ME 98/6/22) that occurred on 9 June 1998 at the natural hillside above Pak Sha Wan Village, Sai Kung. The landslide comprised a narrow depletion zone with a broader deposition area, involving an estimated total volume of approximately 300 m3. The landslide ran along and adjacent to an ephemeral drainage line and through the grounds of two village properties. Damage occurred to external structures, and homes were inundated with mud and muddy water, but no one was injured in the incident.

Section 2 of the report presents the findings of a detailed study of the landslide (GEO Incident No. ME 98/6/55) that occurred on the natural hillside adjacent to the Outward Bound School, Tai Mong Tsai, near Sai Kung in the Eastern New Territories on 9 June 1998. The landslide involved the failure of approximately 30 m of the natural hillside close to the main ridgeline of a coastal peninsula. The resulting debris, estimated at about 900 m3 in volume, came within 20 m of a house at the foot of the hillside, with the subsequent alluvial outwash reaching the road and beach below. The house was uninhabited at the time of the landslide. No fatalities or injuries were reported following the landslide.

Section 3 of the report presents the findings of a preliminary study of a landslide (GEO Incident No. ME 98/5/10) which occurred on the natural hillside above village housing at Luk Keng Wong Uk in the north-east New Territories on the morning of 24 May 1998. The landslide affected about 95 m of natural terrain and approximately 9 m3 of debris deposited in an alley between two houses and a platform in front within the village. No injuries were reported.


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