锦屏一级水电站左坝肩边坡数值模拟

锦屏一级水电站左岸边坡工程地质条件复杂，特别是由控制性软弱结构面切割形成的楔形体对左岸边坡的稳定性影响较大。工程中已采用系统预应力锚索支护和抗剪洞回填对楔形体进行加固处理。为了解两种支护措施及其施工工序对楔形坡稳定性的影响，采用数值模拟方法，对支护措施在不同工况条件下，边坡继续开挖进行模拟计算。通过不同工况数值模拟对比分析发现，系统锚索支护对限制塑性区发展起到了良好的效果，抗剪洞回填对限制楔形体底滑面的错动有非常明显的效果，及时进行锚索支护和回填抗剪洞是锦屏一级水电站左岸边坡在施工期乃至运行期间稳定运行的有力保证，通过控制性软弱结构面的位移变化趋势判断边坡稳定性是可行的。

Numerical Simulation of "Wedge" at Left Abutment of Jinping First Stage Hydropower Station

There is a complex geological condition in the left bank of Jinping First Stage Hydropower Station. The wedge＇s stabilizing is one of the most important problems in the project which is composed of several weak layers. Support methods such as pro-stressed anchors system and shear key were adopted to ensure wedge safety. In order to research the two support methods and construction processes＇ influence in slope stability, the slope continue excavating with the two support methods in deferent construction processes have been used for numerical simulation. After comparison of plastic zone and variation of displacement, it is find that pro-stressed anchors system have an effect on limiting the development of plastic zone, refilling shear keys have en effect on control the displacement of the fault f42-9 which is the bottom slip surface of the wedge. It is very important for the left bank slope stability that completed the two support methods in time. It is feasibly that to decide slope stabilizing by curves of relative displacement between two sides of typical wake layer.