Report No. : GEO Report No. 81

Report Title : Slope Failures along BRIL Roads : Quantitative Risk Assessment and Ranking (1999), 200 p.

Author : ERM-Hong Kong, Ltd.


In 1993, the Geotechnical Engineering Office (GEO) embarked on a programme of research and development studies on landslide risk management under the R & D theme on Quantitative Risk Assessment (QRA).

This study was carried out by Mr Venkatesh Sourirajan of ERM-Hong Kong Ltd under the Consultancy Agreement No. GEO 6/97. The main objective of the study was to formulate a methodology for the ranking of selected roads with a history of landslips (referred to as BRIL roads) based on quantitative risk assessment of slope failures along such roads with due regard given to risk to life and economic losses. Mr K.K.S. Ho and Dr D.O.K. Lo of the Special Projects Division administered the consultancy and reviewed the Report.

In this Report, the results of the study are expressed in terms of risk to life (viz. potential loss of life per year) and economic loss per year due to road closure caused by landslips. The 41 BRIL road sections considered are ranked based on potential loss of life per year and economic loss per year (due to traffic disruption caused by landslips). The roads are also ranked in terms of the total economic loss considering both the cost of a statistical life and economic loss due to road closure.

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