Study on the Development of Slope's Plastic Zone by Strength Reduction FEM

Abstract

Based on the idea presented in literature [4]:when to calculate the safety coefficient by strength reduction FEM, The material's shear strength parameters c and φ will be deducted,it is suggested that sinφ≥ 1-2v.This paper study on the development of slope's plastic zone with different v and by strength reduction FEM, research show that the effect of v on the safety coefficient is not obvious,but when φ=20 and v beside critical value,the effect to the development of the plastic zone is obvious. When the value is bigger, the development of plastic zone occurs in the deep and the potential sliding channel cannot feed through.According this ,this paper puts forward a comprehensive evaluation method that combined with three instability criterions that finite element calculation does not converge,plastic zone run through,displacement of feature points appear inflection point.