黏土斜心墙土石坝稳定性影响因素分析

Analysis on Influencing Factors of Stability to the Design of Clay Soil Sloping Core Earth-Rock Dam

以具体工程实例为研究对象,研究了黏土斜心墙防渗体在坝体中位置、上游坡度、渗透系数变化对斜心墙土石坝渗流和坝坡稳定的影响,以及坝高和黏土斜心墙高对坝体渗流及稳定性的影响,结果表明:斜心墙在坝壳内的位置、上游坡度和坝高对坝体渗透稳定的影响甚微,但斜心墙渗透系数对坝体渗透稳定的影响较大,是影响坝体渗透稳定的关键因素;坝高对上游坝坡稳定的影响幅度相对较大,是影响上游坝坡稳定的关键因素,斜心墙在坝壳内的位置、上游坡度、渗透系数对上游坝坡稳定的影响甚微;斜心墙在坝壳内的位置、上游坡度、渗透系数和坝高4组参数的变化对下游坝坡稳定安全系数虽然有影响,但影响甚微。

The article took a specific project as the object, and researched the change regulations of the clay soil sloping core earth-rock dam＇ s seepage and slope stability induced by the position in the dam of the clay sloping core, the slope ratio of the upriver of the clay sloping core, the hy- draulic conductivity of the clay sloping core, the height of the clay sloping core, and the height of the dam. The results show that： a） As far as the seepage stability of dam is concerned, the influence of the clay sloping core＇ s position in the dam, the slope ratio of the upriver of the clay sloping core, and the height of the dam to it is lighter, but the influence of the clay sloping core＇ s hydraulic conductivity to it is more and also can be taken as the key factor, b） As far as the stability of the upriver slope is concerned, the influence of the dam＇ s height to it is more and can be taken as the key factor, and the influence of the clay sloping core＇ s position in the dam, the upriver slope ratio of the clay sloping core, and the clay sloping core＇ s hydraulic conductivity to it is lighter, c）As far as the stability of the downriver slope is concerned, the influence of the clay sloping core＇ s position in the dam, the upriver slope ratio of the clay sloping core, the clay sloping core＇ s hydraulic conductivity, and the dam＇ s height to it is certain but lighter.