楞古水电站V线右岸边坡深部裂隙成因及边坡稳定性分析

Analysis of the causes of deep cracks in the right bankslope of the V line of Lenggu Hydropower Station and the slope stability

针对楞古水电站V线右岸边坡深部裂隙发育特征,以边坡工程地质条件及坡体结构为基础,结合嘎夏帕滑坡破坏模式对其深部裂隙成因进行了分析,认为其深部裂隙是由于边坡滑移-剪切变形所造成,且边坡缓倾角结构面发育程度决定了边坡深部裂隙分布范围及张开度。分析边坡深部裂隙变形程度,结合边坡整体稳定性FLAC3D模拟,得出蓄水后边坡上游侧稳定性较边坡下游侧更低,以后对边坡采取合理的支护措施提供了可靠的依据,并为同类水电站蓄水边坡稳定性研究提供了参考。

According to the characteristics of deep crack that is only developed in V line right bank slope in Lenggu Hydropower Station,the cause of deep crack is analyzed on the basis of the engineering geologic condition,the slope structure and the Gaxiapa landslide failure mode.The results indicate that the deep crack of the slope is caused by the gravitational creeping instead of common unloading,and the distribution range and opening degree of deep crack of slope are controlled by the development degree of gentle-dip surface.By analyzing the deformation degree of deep fissures in the slope and combining it with the FLAC 3D simulation of the overall slope stability,it was found that the stability of the upstream side of the slope after water storage was lower than that of the downstream side.This provided a reliable basis for taking reasonable support measures for the slope in the future and served as a reference for the study of slope stability during water storage in similar hydropower stations.