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雾江滑坡位于涔天河水库扩建工程库首右岸的雾江峡谷进口段,下游边坡距大坝仅300余米,是一个典型的古滑坡,滑坡总体积为1 327×10~4 m~3,雾江滑坡稳定与否严重影响到大坝及泄水建筑物的运行与安全。首先分析了滑坡体实测位移;接着针对滑坡体处于缓慢蠕滑过程中,采用极限分析法,假定安全系数为1.0,反演了滑坡体的强度参数;然后选取滑坡体内部钻孔观测位移年蠕滑率,假定滑坡体满足莫尔-库仑屈服准则,由Perzyna假设计算黏塑性应变率,结合滑坡体典型剖面有限元模型,采用弹-黏塑性有限元计算程序进行滑坡体分析,将正交设计法和优化算法相结合,反演获得滑坡体和滑带的弹性模量和黏滞系数,为进行该滑坡堆积体的稳定变形分析和监控提供了依据,也可为同类工程参考。
The foggy landslide is located at the inlet of the foggy canyon at the first right bank of the Qiantang River Reservoir Extension Project. The downstream slope is only 300 meters away from the dam. It is a typical ancient landslide with a total volume of 1 327 × 10 ~ 4 m ~ 3 The stability of the foggy landslide seriously affected the operation and safety of dams and drainage structures. Firstly, the measured displacements of the landslide body are analyzed. Then, the limit analysis method is adopted for the slow creep process of the landslide body. The safety factor of 1.0 is assumed to reflect the strength parameters of the landslide body. Slip rate. Assuming that the landslide body meets the criterion of the Mohr-Coulomb yielding, Perzyna’s assumption of visco-plastic strain rate is calculated. Based on the finite element model of the typical section of the landslide, the elasto-viscoplastic finite element program is used to analyze the landslide body. The method combined with the optimization algorithm can obtain the elastic modulus and viscosity coefficient of the landslide mass and the landslide by inversion, which provides a basis for the stable deformation analysis and monitoring of the landslide mass. It can also be used as a reference for similar projects.