Back analysis of flexible barrier response following an open hillslope landslide impact at Pa Mei, Hong Kong

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Publication Title
Back analysis of flexible barrier response following an open hillslope landslide impact at Pa Mei, Hong Kong

Abstract
An open hillslope landslide occurred above Ma Wan New Village at Pa Mei on Lantau Island, Hong Kong in October 2021, involving a total debris volume of approximately 240 m3. About half of the debris was deposited on the hillside while the rest travelled further downslope to hit the edge panels of two flexible rockfall barriers, which had a rated energy capacity of 3,000 kJ. The debris was stopped and retained by the barriers with limited observable damage to the barriers. This paper documents the back analysis of the response of the flexible barriers using the finite element program LS-DYNA. A numerical simulation was first conducted to replicate a full-scale rockfall test to calibrate the flexible rockfall barrier model. The landslide impact process was then reconstructed numerically and calibrated against field observations. The impact velocity and energy were estimated from free-field debris mobility analysis and coupled debris-barrier interaction. Using the calibrated numerical model, a hypothetical landslide debris impact event close to the energy rating of the barrier system is also investigated. Future work on the design of flexible rockfall barrier systems subjected to landslide debris impact is discussed.
Authors
Eugene K. L. Wong; J. W. C. Lau; J. W. He; Z. H. Zhou; S. L. Chan

Published In

18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)

Theme

B - Geohazards

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