水位变动和杆塔荷载对水电站源端输电线路区域边坡稳定性的影响

Influence of water level variation and tower load on slope stability of transmission line area at source end of hydropower station

针对库区及河道沿岸岸堤和边坡由于水力作用侵蚀和水位变动影响边坡稳定性的问题,基于Geo-Studio有限元软件,采用极限平衡原理对某水库岸坡进行稳定性分析,重点考察水位骤降对岸坡稳定性的影响,得到了岸坡安全系数随水位骤降的时间变化关系以及不同库岸水位升降速率下边坡浸润线的变化规律。同时,分析了库水位变化耦合杆塔荷载对水电站源端输电线路区域的边坡稳定性的影响。结果表明:岸坡稳定系数随水位的骤降迅速下降后缓慢增大最后趋于平稳;岸坡稳定系数随水位的上升迅速增大后缓慢减小,最后趋于平稳;水位变动耦合杆塔荷载共同作用时,边坡稳定系数变化趋势与无杆塔荷载作用时基本一致,但临界滑动面安全系数显著降低。此外,水位上升和下降的速率对边坡均具有显著影响。

Aiming at the problem that the slope stability of the embankment and slope along the reservoir area and river channel affected by hydraulic erosion and water level change,based on Geo-Studio finite element software,this paper uses the principle of limit equilibrium to analyze the stability of the bank slope of a reservoir,focusing on the influence of the sudden drop of water level on the stability of the bank slope.The relationship between the time variation of the bank slope safety factor with the sudden drop of water level and the change law of slope infiltration line under different reservoir water level rise and fall rates were obtained,and the influence of reservoir water level change on slope stability was analyzed.The stability coefficient of the bank slope increases rapidly with the rise of the water level,then slowly decreases,and the final area is stable,and the rate of water level rise and fall has a significant impact on the slope.