基于Bishop法基础上的土质边坡有限元强度折减法的适用性探讨

Discussion About Applicability of Strength Reduction FEM Method of Soil Slope Based on Bishop Method

利用有限元强度折减法对土质边坡稳定性系数进行计算。通过强度折减,当边坡出现塑性区贯通时,有限元程序不再收敛,此时的折减系数就应该是边坡的稳定性系数。另外,通过Bishop法得到的边坡稳定性系数和有限元折减法得到的稳定性系数非常接近。由此说明,有限元强度折减法在土质边坡稳定性系数确定方面具有一定的适用性。

The stability coefficient of soil slope is achieved on the basis of the safety factor calculated by the strength reduction FEM method. Through the reduction of values, the FEM computation will not converge when the model reaches plastic zone linking,and the safety factor is just the reduction coefficient at this state. In addition, the stability coefficient obtained by Bishop method is fairly close to that by the strength reduction FEM method. Generally,this may indicate the strength reduction FEM method has certain applicability in the determination of soil slope stability coefficient.