中文摘要：

在水库运营过程中，水库涉水滑坡会有部分滑体没在水下，在采用传力系数法进行滑坡稳定性计算时，滑坡稳定性系数与水下条块的水压力紧密相关。在分析极限平衡法中水上岩土体水压力及渗透力计算方法的基础上，通过水下三角形条块和四边形条块的水压力计算，探讨了传力系数法中位于水下条块的抗滑力及下滑力的计算方法，得出了水下滑体的抗滑力和下滑力只与浮重力的大小有关，与浸没在水下深度的变化无关的结论。研究成果简化了水压力的计算，对水下滑体水压力及稳定性计算具有重要的参考和借鉴意义。

英文摘要：

A part of sliding mass of fording landslide submerges the water level with the operation of reservoir; and the stability factor of landslide has close connection with water pressure of slices below the water level when the transmission coefficient method is used to calculate the stability of landslide. Based on analysis of calculation methods about water pressure and seepage force above water level of limit equilibrium method, the water pressure acting on triangle slice and quadrangle slice below the water level is calculated; and the calculation methods about sliding resistances and sliding forces of slice below water level are discussed. It is concluded that sliding resistances and sliding forces of slice below water level only have connection with slice gravity calculated through buoyancy unit weight, and have no connection with vertical distance between the slice and reservoir water level. The results make the calculation of water pressure easier, and have reference significance for the calculation of stability of sliding mass below the reservoir water level.