基于等效面积Drucker-Prager模型探讨边坡破坏机制

Study on Slope Failure Mechanism Based on Drucker-Prager Failure Criteria of Equivalent Area

强度折减有限元法在边坡稳定性分析中得到了广泛应用。基于等效面积的D-P屈服准则如DP1,DP2,DP3,DP4等模型来模拟二维和三维边坡稳定状况,进行了边坡稳定性分析计算。得出不同折减系数下边坡中广义塑性应变的变化情况,结果表明用该模型能较好地模拟土坡的渐近破坏过程,有助于对边坡的破坏机制的更深层次的理解;并把计算结果和传统极限平衡方法进行了对比,表明三维稳定有限元分析可较二维有限元更加真实地反映边坡的稳定状况;基于等效面积的D-P屈服准则的DP3模型的计算比较真实,更好地模拟了边坡的破坏机制。

Some problems have not still been solved smoothly in slope stability analysis using shear strength reduction finite element method until now.Different equivalent area Drucker-Prager yield criteria,such as DP1,DP2,DP3 and DP4 yield criteria,can give an approximate estimation of soil failure strength under two and three-dimensional slope stability analyses condition,and the slope stability coefficient was calculated.Coming to different discount coefficients in the generalized plastic strain slope development,it can be able to simulate the failure process of slope.And the calculation result is compared with the result calculated by using the traditional limit equilibrium method,it shows that the three-dimensional finite element analysis conforms to the reality more than two-dimensional finite element analysis,whereas the DP3 yield criterion,which can carry out more real calculation,will give a better simulate slope failure mechanism.