雨水入渗对某高边坡作用机理研究

Study on The Mechanism of Rainwater Infiltration on A High Slope

雨水入渗直接影响到边坡的物理力学指标,影响深度和范围难以确定。基于某一实例,对边坡岩土参数进行大量试验对比,试验研究表明黏土②层室内试验内摩擦角浸水指标比天然指标降低了33.5%,粘聚力浸水指标比天然指标降低了26.5%。片麻岩③-1层片麻岩室内试验内摩擦角浸水指标比天然指标降低了21.2%,粘聚力浸水指标比天然指标降低了38%。浸润线深度的确定边坡影响存在重要影响:随浸润线深度增加边坡稳定系数降低,呈对数分布;随浸润线深度增加边坡剩余下滑力增加,呈近似指数分布。

Rainwater infiltration directly affects the physical and mechanical indexes of slope,and the depth and scope of influence are difficult to determine.In this paper,based on a case study,large number of tests are carried out to compare the geotechnical parameters of the slope.The test results show that the immersion index of the internal friction angle in the laboratory test of clay layer②is 33.5%lower than that of the natural index,and the immersion index of the cohesion is 26.5%lower than that of the natural index.In the laboratory test of gneiss③-1,the immersion index of internal friction angle is 21.2%lower than that of natural index,and the immersion index of cohesion is 38%lower than that of natural index.The determination of the depth of the phreatic line has an important influence on the slope:the slope stability coefficient decreases with the increase of the depth of the phreatic line,showing a logarithmic distribution;the residual sliding force of the slope increases with the increase of the depth of the phreatic line,showing an approximate exponential distribution..