水动力型滑坡堆积体渗流稳定性数值分析

Numerical Analysis of Seepage Stability of Hydrodynamic-induced Landslide Deposits

汛期强降雨对水动力型滑坡堆积体渗流稳定性有着重要影响.本文结合三板溪水电站库区东岭信滑坡堆积体工程,揭示了正常蓄水位条件下降雨入渗对深厚滑坡堆积体孔隙水压力变化的影响机理,开展了不同工况下滑坡堆积体渗流稳定性数值分析.数值计算结果表明,滑坡堆积体前缘局部稳定性主要受库水位和降雨入渗联合作用;滑坡堆积体中后部稳定性主要受降雨入渗影响,受库水位影响不明显,因此,汛期强降雨是影响深厚滑坡堆积体整体稳定性的关键因素,设置排水洞可有效提高东岭信滑坡堆积体整体稳定性.研究结果可为类似水动力型堆积体滑坡灾害治理与防范提供参考.

Heavy rainfall in flood season has important influence on the seepage stability of hydrodynamicinduced landslide deposits.Combining with the Donglingxin landslide deposits in the reservoir area of Sanbanxi Hydropower Station,the influence mechanism of rainfall infiltration on the change of pore water pressure of deep landslide deposits under normal water level conditions is revealed;and the numerical analysis of seepage stability of landslide accumulation body under different working conditions is carried out.The numerical calculation results show that the local stability of the front edge of landslide accumulation body is mainly affected by the combined action of reservoir water level and rainfall infiltration.The stability of the middle and trailing edges of the landslide deposits is mainly affected by rainfall infiltration;it is not significantly affected by reservoir water level.Therefore,the heavy rainfall during flood season is a key factor affecting the overall stability of the Donglingxin landslide deep deposits.The results can be used as a reference for landslide control and prevention of similar hydrodynamic accumulation body.The research results can provide reference for the treatment and prevention of similar hydrodynamic-induced landslide disasters.