Upper bound analysis of slope stability with nonlinear failure criterion based on strength reduction

• 作 者: ZHAO Lian-heng LI Liang YANG F
• 机 构: School of Civil and Architectural Engineering
• 出 处: 中南大学学报（英文版）
• 发表日期: 2004年期
• 关键词: nonlinear failure criterion strength reduction method upper-bound theorem of lim

Based on the upper bound limit analysis theorem and the shear strength reduction technique,the equation for expressing critical limit-equilibrium state was employed to define the safety factor of a given slope and its corresponding critical failure mechanism by means of the kinematical approach of limit analysis theory.The nonlinear shear strength parameters were treated as variable parameters and a kinematically admissible failure mechanism was considered for calculation schemes.The iterative optimization method was adopted to obtain the safety factors.Case study and comparative analysis show that solutions presented here agree with available predictions when nonlinear criterion reduces to linear criterion,and the validity of present method could be illuminated.From the numerical results,it can also be seen that nonlinear parameter m,slope foot gradient β,height of slope H,slope top gradient a and soil bulk density Y have significant effects on the safety factor of the slope.