改进的重力加载法在土质边坡中的应用

Application of Improved Gravity Loading Method in Soil Slope

为改善传统重力加载法求得的稳定性系数偏大的不足,以江西九江某天然土质边坡为研究对象,通过加载土体的重力加速度来降低边坡稳定性,采用FLAC3D软件确定边坡的极限平衡状态,将此状态下边坡的下滑力与加载过程中增大的摩擦力之差作为抗滑力,并将其与自然状态下的下滑力之比定义为边坡的稳定性系数,提出了改进的重力加载法,并与传统重力加载法和简化Bishop法进行对比分析,验证其可行性。结果表明:改进的重力加载法考虑了重力加速度加载过程中摩擦力的增大,得出边坡的稳定性系数为1.22,比传统的重力加载法减小了11.5%,与简化Bishop法十分接近,能够用于边坡稳定性分析。

In order to overcome the shortcoming that the coefficient of stability obtained by traditional gravity loading method is usually larger, a natural soil slope in Jiujiang, Jiangxi Province was taken as the research object. The stability of the slope was reduced by the accelerating of gravity of the loaded soil, and FLAC3D was used to determine the limit equilibrium state of the slope. The anti-sliding force was regarded as the difference between the sliding force in the limit equilibrium state and the increasing friction force during the loading process. The stability factor of slope was defined as the ratio of the anti-sliding force to sliding force in natural condition. The improved gravity loading method was presented, and its feasibility was verified based on the comparison with the traditional gravity loading method and simplified Bishop method. The results show that the improved gravity loading method considers the increase of friction force during the loading process of gravity, and the coefficient of stability of the slope is 1.22. Compared with the traditional gravity loading method, the stability coefficient is reduced by 11.5%, which is very close to the simplified Bishop method. The improved gravity loading method can be used for slope stability analysis.