基于强度折减理论的水位下降坝坡稳定性分析

为了能够准确地分析某水库在水位下降期坝坡的稳定性,基于非饱和土流固耦合理论和强度折减有限元法,利用Geo Studio数值模拟软件进行数值模拟,根据模拟结果对该水库在水位下降的情况下进行了边坡稳定性分析。结果表明:水位下降时,由于坝体孔隙水压力消散较慢,水位滞后于库内水位,从坝顶到迎水坡坡脚形成了塑性应变联通区域,特征点位移突变且位移等值线分布密集,表明此处为可能潜在最危险滑动面,并基于强度折减法确定了安全系数值。

Stability Analysis of Dam Slope During Rapid Drawdown with Strength Reduction

In order to accurately analyze the stability of the dam slope during the drop of water level,based on fluid-solid coupling theory of unsaturated soil and strength reduction finite element method,this research adopted the numerical simulation software Geostudio.The numerical simulation model was developed and the dam seepage was analyzed during the water falling period.The results indicates that pore water pressure in the dam body dissipates slower in the calculation area,lagging behind the water falling level,plastic strain area creates from the dam crest to the foot of the upper stream batter,feature point displacement suddenly changes and the displacement contour distributes closely,which indicates that it is the most potential dangerous sliding surface and the safety factor was then determined based on strength reduction method.