雅砻江某水电站坝肩边坡稳定性研究

Slope Stability of Dam Abutment of A Hydropower Station on Yalong River

从工程需要出发,在大量现场调研、平硐资料搜集及室内分析的基础上,运用数值模拟软件(FLAC3D及ANSYS)对雅砻江某水电站左右坝肩边坡在不同条件下(天然、降雨及地震工况)的稳定状况进行计算分析,结果表明,左岸坝肩边坡为斜顺向坡,地形较完整,未见整体变形破坏迹象,仅局部块体发生滑移破坏。岩体受构造影响较弱,裂隙以中、陡倾角为主。右岸坝肩边坡为斜反向坡,地形欠完整。主要表现为块体的滑塌破坏、楔形体破坏两种破坏模式。左、右岸坝肩边坡在自然工况、降雨工况以及地震工况条件下均存在局部失稳的可能性,整体稳定性较好。

For the needs of engineering project, and based on data collection and indoor analysis of a large number of field survey, numerical simulation software （ Ansys and FLAC3D） is used to calculate and analyze the stability dam abutment slope around a hydropower station in Yalong River under different conditions （ natural, rainfall and earthquake conditions） .The results show that the left bank abutment slope is a inclined consequent slope, and the terrain is complete.No sign of whole deformation appeared and only local block sliding occurred.Influenced by tectonic weak rock mass, the fracture mainly, steep dip Angle.The right bank abutment to reverse slope Angle, slope topography is incomplete.Main show is block sliding failure wedge failures, the two models. Left and right bank abutment slope condition, working condition of rainfall and earthquake conditions in natural conditions exist the possibility of local buckling, but the overall stability is good.