结合工程实例,首先对场区进行详细的调绘、勘探及试验,查明场区的工程地质、水文地质条件及岸坡基本特征;然后进行稳定性计算分析。结果表明:水库蓄水后,粉砂质泥岩受库水浸泡后存在一定程度软化现象,导致强风化层抗剪强度降低、产生动静水压力、下滑力增大,导致强风化稳定性下降。岸坡潜在变形破坏为强风化粉砂质泥岩内的圆弧滑动;水库蓄水后,打磨湾大桥道真岸不满足安全控制标准。库水位升降至569m标高时,稳定性系数下降加快,说明水库调蓄是导致岸坡稳定性系数降低的关键因素。 Combined with the engineering examples, first of all, detailed drawing of the site area, exploration and testing, to identify the site of engineering geology, hydrogeological conditions and the basic characteristics of the bank; and then the stability of the calculation and analysis. The results show that the silt mudstone is softened to a certain degree after soaking in the reservoir water, which leads to the decrease of the shear strength of strong weathered layer, resulting in hydrostatic pressure and slip force, which leads to the decrease of strong weathering stability. The potential deformation and failure of the bank slope is a circular arc in the strong weathered silty mudstone. After the reservoir is impounded, the real shore of the Daowan Bay Bridge Road does not meet the safety control standards. When the water level of the reservoir rises to 569m elevation, the stability coefficient declines faster, which shows that reservoir regulation and storage is the key factor to reduce the stability coefficient of bank slope.