考虑应变软化的边坡稳定分析

Stability Analysis of the Slope Considering Strain Softening

摘要:

在密砂、坚硬黏土及原状土的强度试验中,土试样常表现为应变软化,随着应变的增加其抗剪强度降低,并且发生渐进破坏。应用传统的极限平衡法,采用峰值强度作为计算参数进行稳定分析验算时,通常忽略土材料的渐进破坏过程,这可能会对边坡稳定评价带来不利影响。基于有限元极限平衡法,提出考虑应变软化的边坡稳定分析方法,并通过算例分析证明该方法的合理性。

Abstract:

In the laboratory,when dense sand,stiff clay,and undisturbed soil were subjected to strength tests,these soils experienced a pronounced strain-softening behavior.A progressive failure in these materials was due to a reduction of strength produced by increasing strain.However, the standard soil test method provides that the material's peak strength is considered to be its failure strength based on the relationship between stress and strain.Progressive strength failure in soils has been previously ignored during the analyses performed using the traditional limit equilibrium approach on the basis of peak strength.In this paper,a new finite element limit equilibrium method is proposed in which strain-softening properties of the soil were assumed.And it was shown that this method can predict the stability of strain-softening soils for engineering purposes.