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Numerical Simulation of the Effects of Seepage and Underground Drainage on Slope Stability- A Case Study of Li-San Landslide-
|作者:||鄧鳳儀||關鍵字:||Seepage;滲流;Underground Drainage;Slope Stability;Landslide;rainfall;Li-San;catch wells;Horizontal Drains;地下排水工法;邊坡穩定;地滑;降雨;梨山;集水井;橫向排水管||出版社:||水土保持學系||摘要:||
Landslides event are frequently resulted from torrential rainfall and upwelling of groundwater. Therefore, it is crucial in the slope stabilization how to implement dewatering techniques effectively. The installation of drainage system on ground surface is capable of shortening the infiltration of rainwater while the underground dewatering system is advantageous to the dissipation of pore water pressure and increases the stability of slope.
In general, it seems that the effect of underground dewatering on the groundwater drawdown was commonly neglected in the conventional slope stability analyses. At the meantime, the analyses were normally performed under hydrostatic condition and exclude the variation of pore water pressure during rainfall.
Incorporating two dimensional finite element seepage analyses with limit equilibrium analysis, this study investigates the effect of underground dewatering on the slope stability of Li-San landslide. It was found that the predicted potential sliding surfaces under the rainfall condition during Typhoon seasons are excellently in agreement with those from the field observations. In addition, the effect of vertical well shaft for groundwater collection and horizontal drains on the slope stability can be successfully simulated by imposing an outflow seepage boundary on the drainage path. The boundary is alternately consisted of an aligned flux nodal points and which makes the outflow seepage boundary function as a potential seepage surface.
|Appears in Collections:||水土保持學系|
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