Report No. : GEO Report No. 174

Report Title : Design Basis for Standardised Modules of Landslide Debris-resisting Barriers (2005), 161 p.

Author : H.W. Sun, T.T.M. Lam & H.M. Tsui

Abstract

New developments on or close to natural hillside, together with the need to react to known natural hillside landslide hazards posed to existing developments, has created a growing demand for natural terrain hazard assessments as well as design and construction of the necessary landslide mitigation works in Hong Kong. The detailed design of a debris-resisting barrier can be a technically demanding and time consuming process. The development of suitably conservative standardised modules of landslide debris-resisting barriers and a framework based on which these measures may be prescribed for a given site without the need for detailed investigation of the hillside, debris runout modelling and detailed structural design would therefore be beneficial.

A suitably conservative design approach for standardised modules of debris-resisting barriers has been formulated by applying, and where appropriate extending, the methodology given in GEO Report No. 104 (Lo, 2000). Various types of standardised barriers have been developed to suit a range of natural hillside profiles as well as different design events with a debris volume ranging from 50 m³ to 600 m³.

This report describes the development of the technical basis for the design methodology for standardised debris-resisting barriers and outlines the key design considerations and assumptions made.

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