水位变化下膨胀土岸坡渗流场和稳定性分析

河水位的升降变化对含裂隙的非饱和膨胀土岸坡稳定性有着显著的影响。水位的变化引起岸坡内地下水位的变化是非饱和到饱和的过程。运用非饱和渗流理论,模拟了在河水位升降过程中膨胀土岸坡暂态渗流场的变化,分析水位变动时孔隙水压力的变化,同时对某岸坡进行了稳定性评价,研究了在水位变化以及裂隙深度变化条件下的岸坡稳定性。结果表明:水位升降对岸坡内部渗流场的影响具有明显的分带性,在经过水位变化过程后,岸坡稳定性有降低趋势,且岸坡表层的裂隙对稳定性的影响没有水位变化的影响大。

Analysis of Seepage and Stability of the Expansive Soil Reservoir Slope When Water Level Changes

The change of river water level fluctuation had a great effect on stability of the unsaturated expansive soil’s reservoir slope with cracks.That was a process from unsaturated to saturated in the groundwater seepage field in reservoir slope,caused by the change of river water level.Based on the unsaturated seepage theory,the transient change of seepage was simulated,and the pore water pressure was also analyzed during the process of river water level changes.At the same time,the stability of reservoir slope was analyzed under the conditions of the changed water level and crack depth change.The results showed that the effect on interior seepage of reservoir slope caused by water level fluctuation has an evident diversity,the stability of reservoir slope has the trend of reduction and the effect of the surface cracks on the stability was less than the water level change after the process of water level change.