复杂地质水库边坡滑动带的强度参数反演及其稳定性研究

Inversion of Strength Parameters and Stability of Sliding Layer of Complex Geological Reservoir Slope

复杂地质水库边坡因其覆盖层厚、地质岩土层多等特点一直成为边坡治理的难点。采用Morgenstern-Price法对长江中下游某水库复杂地质边坡滑动带强度参数进行反演,基于反演参数,分析蓄水深度、抗滑桩加固形式及开挖削坡减载等工况对边坡稳定性影响。研究结果表明:①该复杂地质水库边坡滑动带强度反演参数内摩擦角为10.4°,黏聚力为22 kPa,内摩擦角的敏感度要比黏聚力更高;②边坡稳定安全系数随着水库蓄水深度增加而降低;③设立抗滑桩对该边坡的安全加固作用没有显著效果,而开挖削坡对提高该边坡安全稳定作用效果明显,开挖削坡后的边坡安全系数达到1.262,处于安全稳定状态。研究成果可为复杂地质水库边坡的加固治理研究提供参考。

The complex geological reservoir slope has always been a difficult point for slope treatment due to its thick cover and geological rock layers.The Morgenstern-Price method was used to invert the strength parameters of the complex geological slope sliding layer of a reservoir in the middle and lower reaches of the Yangtze River.Based on the inversion parameters,the influences of water storage depth,anti-slide pile reinforcement form and excavation slope reduction on slope stability were analyzed.The research shows that:①The inversion parameters of the sliding layer of the complex geological reservoir slope have an friction angle of 10.4°and a cohesive force of 22 kPa.The sensitivity of the friction angle is stronger than that of the cohesive force;②The stability safety factor decreases with the increase of reservoir water storage depth;③The establishment of anti-slide pile has no significant effect on the safety reinforcement of the slope,and the excavation and slope cutting has obvious effect on improving the safety and stability of the slope.The safety factor of the slope after cutting the slope reaches 1.262,which is in a safe and stable state.The research results can provide reference for further research on the reinforcement of complex reservoir slopes.