基于ABAQUS的强度折减有限元法边坡稳定性分析

将强度折减有限元法与ABAQU S软件相结合,充分利用ABAQU S软件强大的后处理功能,动态显示广义塑性应变和塑性区的开展情况,以此对边坡稳定性进行判定。在ABAQU S软件的模拟计算中,通过不断调整强度折减系数F的大小,改变土体的强度指标c、值,得到不同折减系数下边坡中广义塑性应变的发展情况;当塑性区趋于贯通,且广义塑性应变和位移发生突变时,则边坡处于破坏的临界状态,此时的折减系数就定义为边坡的最小稳定安全系数。通过天然直立边坡及开挖边坡的实例分析,表明该法可以较准确形象地预测边坡潜在滑裂面的位置及评价边坡的稳定性,在复杂条件下的基坑边坡稳定性分析中是简便实用的。

The Analysis of Slope Stability by Strength Reduction FEM Based on ABAQUS Software

The shear strength reduction FEM has been combined with the large finite element software ABAQUS,which has the strong functions to handle the calculated results.By dynamic manifestation of the development of generalized plastic strain in ABAQUS software,the generalized plastic strain and its development zone can be put as the evaluation criteria for the slope stability.By adjusting the size of the shear strength reduction factor F continuously,changing the magnitude of shear strength parameters c?φ of soils,the various development of the generalized plastic strain of slope under different reduction factors can be gained.When the plastic strain zone appears to run-through the top of slope,at the same time the plastic strain and displacement increase rapidly,it indicates that the slope has been at the critical state of breakage.Then this reduction coefficient can be defined as the minimum safety factor of slope.Through numerical analysis of a natural vertical slope and some excavated slopes,it is indicated that the proposed method in this paper can rather exactly predict the corresponding shape and position of the potential slip surface and the safety factor,and is especially simple to be applied to complicated cases.