渗透系数与库水位变化对边坡稳定性的影响

针对水利工程中复杂的库岸工程地质条件,以及库水位的变化对库岸边坡的稳定性会产生各种不利影响的实际,对不同渗透系数土质边坡在库水位下降速率变化下的稳定性进行了数值计算和分析,计算了在库水位下降期间,不同渗透系数滑坡体的稳定性受库水位下降速率影响的变化规律．结合库水位下降期间不同渗透系数滑坡体的渗流场,对滑坡体的稳定性进行了数值计算分析,得到了库区降水速率和渗透系数与边坡稳定性之间的关系．结果表明：对于同种材料的滑坡体,降水速率越快,滑坡体达到最低安全系数所需的时间就越短,且水位下降到同一位置时,降水速率越快,库岸的安全系数就越低,越可能发生滑坡;相同渗透系数的滑坡体在不同降水速率下其稳定性的变化曲线都是相似的．

Influence of Permeability Coefficient and Reservoir Water Level Variation on Slope Stability

Considering the complicated geological conditions of reservoir banks in hydraulic projects and the adverse influence upon the slope stability due to the variable reservoir water level, the stability of soil slope with different permeability coefficients under different drawdown velocities of water level was numerically computed and analyzed. The continuous variation of slope stability with different permeability coefficients during the water level drawdown period was obtained. Combining the seepage field of the slide mass with different permeability coefficients during the water level drawdown period, the slope stability was investigated, and the relationships of the drawdown velocity and permeability coefficient with the slope stability were obtained. For the slope mass of same materials, the faster the water level draws down, the shorter the time to reach the minimum safety factor is. Moreover, at the same drawdown height of water level, the faster the water level draws down, the lower the safety factor of reservoir bank is to evoke a possible landslide. The stability curves of slope masses with same permeability coefficient are similar under different drawdown velocities.