边坡稳定安全系数受多方面因素的影响,其中地下水位线的不同处理方式对边坡稳定的影响较大。由于实际工程问题的复杂性,一般需要基于某种假定获得新的地下水位线。基于极限平衡理论,结合雾江滑坡体工程,对比分析2种地下水位线处理方式对安全系数的影响,同时探讨了不同水位下的的临界地下水位。分析表明:假定库水位与原始地下水位水平直接相连,古滑带安全系数随着水位上升呈现先缓慢增加后逐渐减小的趋势;而假定考虑滑坡体内地下水位变化,古滑带安全系数随着蓄水位的上升呈现逐渐减小的趋势,即考虑库水位引起地下水位变化后,安全系数有一定的降低,安全系数偏于保守;并且不同库水位都存在一个临界地下水位比例系数,且比例系数位于0~1之间。

The factor of slope’s stability safety is influenced by various factors, among which groundwater level processed by different methods has great influence on the stability of slope. Due to the complexity of actual engineering problems, we generally need to obtain new groundwater level based on some assumptions. According to limit equilibrium theory, we compared and analyzed the influences of two different methods of processing groundwater line on the safety factor, and discussed the critical groundwater level corresponding to different reservoir water levels. An ancient landslide at Wujiang was taken as a case study. Result shows that 1) under the assumption that the reservoir water level is directly connected with the original groundwater level, the safety factor of landslide increases slowly and then decreases gradually with water level rising; 2) in consideration of groundwater level fluctuation, the safety factor of landslide tends to decrease with the increase of storage water level, indicating that the safety factor is conservative; 3) the factor of proportionality of critical groundwater level in the presence of different reservoir water level is between 0 and 1.