渗流对土质边坡稳定性影响分析

根据强度折减有限元法,采用Mohr-Coulomb屈服准则及关联流动法则,以收敛性准则结合特征点位移突变准则作为边坡失稳判据,研究了无渗流、渗流应力耦合及非耦合情况的土质边坡的稳定性.研究表明:1)渗流对边坡稳定性的影响十分明显,无渗流及渗流应力耦合两种情况的均质边坡的最小安全系数分别为1.84、1.115;2)渗流应力耦合效应对边坡稳定的影响极其不利,应该采用耦合方法评价边坡的稳定性,耦合、非耦合情况的最小安全系数分别为1.115、1.28.

Influence of seepage on stability of soil slopes

Based on the shear strength reduction finite element method,this paper analyzed the stability of homogeneous soil slope under the cases of no-seepage,seepage-stress uncoupling and seepage-stress coupling,adopting the Mohr-Coulomb yield criterion and associated flow law,employing the convergence criteria and abruptness displacement criteria at a certain characteristic location as evaluating critical instability condition of slope.The results indicate:1)seepage affects the slope stability seriously;the minimum safety factors of the no-seepage and seepage-stress coupling cases are 1.84,1.115 respectively;2)the seepage-stress coupling effect is very adverse to slope stability and should be adopted for evaluating the stability of soil slope;the minimum safety factors of the coupling and no coupling cases are 1.115,1.28 respectively.