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Jiu Jimmy Jiao, Subhas Nandy and Andrew Malone
Abstract
A study is being conducted to understand delayed slope failures caused by hydrogeological regimes and the preliminary findings from this study are summarised in this paper. The slope near Tuen Mun Highway Chainage 550 in Hong Kong which failed about 13 days after a major rainstorm in 1983 was chosen as a case study. Topographical, geological and hydrogeological conditions at the hillside above the failure area are investigated to explore delayed groundwater response and the timing of the landslide. MODFLOW is used to simulate groundwater flow in response to heavy rainfall. The slope comprises igneous rock of different degrees of weathering and is represented by layers of various permeabilities. The hydrogeological model can reproduce reasonably well the delayed groundwater response and the stable hydraulic head behind the slope.