【摘要】 利用有限元模型分析了不同影响因素(坡角、黏聚力、内摩擦角、地下水位高度、设计峰值加速度)对边坡稳定性影响的显著性,并研究了地下水位变化对边坡稳定性和变形的影响规律。结果表明:内摩擦角对边坡稳定性影响最大,其次为设计峰值加速度、坡角、黏聚力、地下水位高度。地下水位的变化可使边坡安全系数降低15%,因此地下水的影响不容忽略。当水位达到较高位置(地下水位高度达22 m)时,水平最大位移比无水时增加58.33%。随着地下水位的升高边坡的最大水平位移开始表现出边坡后缘下挫并逐步向前缘扩展的趋势,使得边坡的变形最大值由边坡的最高处开始向坡脚处转移。当地下水位升高一定高度时,边坡的最大水平位移会出现一个突变,位移最大区域向边坡内部扩展,说明地下水的影响使得边坡滑动面向边坡内部延伸,其滑动规模增大,这可作为边坡滑坡预测的重要指标。更多还原

【Abstract】 With the help of finite element model,different factors(slope angle,adhesion force,angle of internal friction,underground water level,and designed peak acceleration) and the possible impact they might generate to slope stability were studied,with special focus being given to relation among underground water level,slope stability and deformation.The results showthat angle of internal friction has proven to be the most influential factor in this study,which is followed by designed peak acceleration,slope angle,adhesion force and underground water level.It needs to be noted that the last factor cannot be overlooked,as its change may lead to a 15% drop in slope’s safety factor.If the water level reaches a relatively higher level(H= 22 mfor instance),the maximumhorizontal displacement is increased by 58.33%,compared with the case where Hstands at 0.As the water level climbs up,the maximumhorizontal displacement starts to take place at the forward edge,rather than the trailing edge of the slope;in other words,the maximumvalue,which is f irst observed at the peak of the slope,nowmoves to the toe.A sudden change is noticed in the slope’s maximumhorizontal displacement,as the underground water level reaches certain point.The region where the maximumvalues f irst are found nowexpand to the interior part of the slope,which indicates the expansion of the sliding scale.Therefore,it should be considered as an important index in the analysis of slope stability.更多还原