库水与降雨作用下三门洞滑坡渗流特征及稳定性分析

Seepage and Stability Analysis of Sanmendong Landslide Under the Combined Action of Reservoir Water and Rainfall

从三峡库区三门洞滑坡的工程地质概况出发,分析了滑坡的宏观巡查及监测数据反映的变形特征,总结变形规律。然后分别以渗流场理论和稳定性分析基本理论为基础,对设置的不同工况进行了地下水位模拟及稳定性计算。结果表明:库水位上升时,水位线呈下凹状,提高滑坡的稳定性;库水位下降时,水位线呈上凸状,降低滑坡的稳定性。并且下降速率越大,水位线凸出越显著,稳定性系数降低越快。此外,降雨会抬高地下水位线,也对滑坡稳定性不利。

Considering the engineering geology conditions of Sanmendong landslide in Three Gorges Reservoir,macro patrolling and monitoring data of the deformation characteristics were analyzed,and deformation law was summarized.Then based on seepage field theory and the basic theory of stability analysis,the underground water level simulation and stability calculation was conducted by setting different working conditions.The experimental results showed that when the reservoir water level raised,the water line was concave shape,which improves the stability of the landslide;under the reservoir water falls,the underground water level is convex,which reduces the stability of the landslide.With the decline rate increases,the water line projecting is more significant,and stability coefficient decreases faster.In addition,rain will raise the groundwater table,and do harm to the stability of the landslide.