库水位下降条件下残积土边坡的力学响应

为了进一步认识库水位下降对残积土边坡力学响应的作用机理,基于饱和—非饱和渗流以及非饱和土力学理论,采用有限元软件,分析了库水位下降条件下残积土边坡的渗流场、应力场和位移场分布特征。结果表明,库水位下降过程中,路基内浸润线随下降速率的不同而差异较大,但随时间增长趋于一致;路基内孔隙水压力及位移均随水位下降持续时间及下降速率的增大而增大,坡体土有效应力逐渐增大,但总应力不变;边坡安全系数随时间呈现出先下降后上升的变化趋势,建议在水库泄洪管理方面,适当控制泄洪速率,同时加强路基坡体排水,以有利于库岸边坡稳定。

Mechanical Response of Residual Soil Slope Under Declined Reservior Water Lever

To recognize the effect mechanism of declined reservoir water level on residual soil slope,based on saturated unsaturated seepage theory and unsaturated soil mechanics,the distribution features of seepage field,stress field and displacement field with declined reservoir water level were discussed by using finite element method.The results indicated t hat different declined rates caused different saturated line in the sub grade in the process of reservoir water declining,however,the saturated lines tended to be consistent as time went on.The pore water pressure and the displacement increased with the duration time of water level and declined rate,and the effective stress in the slope increased while the total stress kept constant.The slope safety factor appeared to decrease firstly and increase subsequently.Hence,controlling flood rate and strengthening sub grade drainage in the management of reservoir floor discharge are recommended to benefit reservoir slope stability.