TRIGRS-Assessment of the effects of grid size, rainfall pattern, and groundwater stage on slope stability at Sh-Tsun-Laio landslide

in International Symposium (poster paper), 國際研討會(全文海報發表)
標題TRIGRS-Assessment of the effects of grid size, rainfall pattern, and groundwater stage on slope stability at Sh-Tsun-Laio landslide
出版類型國際研討會(全文海報發表)
出版年度2010
AuthorsWang, 王姵兮, Wu 吳嘉俊, & 王威豪
出版日期Apr 26 2010 12:0
會議地點台北
其他編號0000
中文摘要

Shan-Tsun-Laio landslide continuously in motion is situated at Fu-Hsin village in ChihChang Township, Taitung County. The invasion of Xangsan Typhoon that brought 603mm of precipitation on October 30th, 2000, which later on triggered the landslide on November 3rd. TRIGRS was used in this study to understand the effects of grid sizes, rainfall patterns, and groundwater stages played during the landslide events. The simulation results indicated that grid size affect both grid’s safety factor and pore pressure head. Larger the grid size, less sensitivity the surface slope of the grid becomes which equally reduces the slope instability. Simulation results also showed the effect of initial groundwater level to both pore pressures and safety factor. If simulation started with low groundwater level, then number of grids with safety factor less than unity consisted 17.63% of the total grids in the beginning of a rainstorm event (t=1hr). If simulation started with high groundwater level, then 22.42% of the total grids possessed safety factors less than critical. However, the effect of groundwater level diminished at the end of the rainfall event (t=60hr) with only 0.06% of increase in percentage of grid counts having safety factor less than 1.0. Right- and left-skewed rainfall events were used to assess the effect of rainfall pattern. The simulation results indicated that left-skewed rainfall events had higher influence on the rises of pore pressure and slope instability.

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