Report No. : GEO Report No. 358

Report Title : Technical Development Work on Design of Rigid Debris-resisting Barriers (2022), 397 p.

Author : L.A. Wong, H.W.K. Lam, C. Lam & J.S.H. Kwan

Abstract

In 2000, GEO Report No. 104 was published based on the state of the knowledge as of the late 1990s which sets out the geotechnical parameters and considerations for the design of rigid  debris-resisting barriers. In 2012, GEO Report No. 270 was published to supplement and update the relevant design guidance provided by GEO Report No. 104, based on a review of
state-of-the-art literature and international technical guidance documents in the early 2010s. The recommendations given in GEO Report No. 270 were promulgated in GEO Technical Guidance Note (TGN) No. 33.

Based on a desk study review and site inspection of selected barriers, technical recommendations on proper detailing of rigid debris-resisting barriers were promulgated in GEO TGN No. 35. Subsequently, the prevailing design guidelines were updated based on the technical advice given by Professor O. Hungr from the perspective of value engineering as promulgated in GEO TGN No. 47.

Since then, the GEO has conducted a series of technical development work, with a view to further optimising the design of rigid debris-resisting barriers. The work included large-scale experimental studies, numerical analyses as well as analytical studies, covering geotechnical stability, structural integrity and detailing for deflector.

This series of technical development work provides further evidence to supplement and update relevant technical design guidance given in GEO Report No. 104, GEO Report No. 270, GEO TGN No. 35 and GEO TGN No. 47. Subsequently, GEO TGN No. 52 was promulgated which stipulates the technical recommendations pertaining to the enhancement of rigid debris-resisting barrier design. This GEO report documents the technical development work pertinent to the development of GEO TGN No. 52.

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