Stability analysis of slopes in soils with strain-softening behaviour

被引:106
作者
Conte, E. [1 ]
Silvestri, F. [2 ]
Troncone, A. [1 ]
机构
[1] Univ Calabria, Dipartimento Difesa Suolo, I-87036 Cosenza, Italy
[2] Univ Naples Federico II, Dipartimento Ingn Idraul Geotecn & Ambientale, Naples, Italy
关键词
Strain-softening; Progressive failure; Slope stability; Non-local elasto-viscoplastic model; FINITE-ELEMENT ANALYSIS; PROGRESSIVE FAILURE; STRONG DISCONTINUITIES; FRICTIONAL MATERIALS; LOCALIZATION; DEFORMATION; PLASTICITY; CLAY; INSTABILITY; SIMULATION;
D O I
10.1016/j.compgeo.2010.04.010
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
This paper presents a numerical approach to analyse the stability of slopes in soils with strain-softening behaviour. In these materials, a progressive failure can occur owing to a reduction of strength with increasing strain. Such a phenomenon can be analysed using methods that are able to simulate the formation and development of the shear zones in which strain localises. From a computational point of view, this presents many difficulties because the numerical procedures currently used are often affected by a lack of convergence, and the solution may depend strongly on the mesh adopted. In order to overcome these numerical drawbacks, in the present study use is made of a non-local elasto-viscoplastic constitutive model within the framework of the finite element method. The Mohr-Coulomb yield function is adopted, and the strain-softening behaviour of the soil is simulated by reducing the strength parameters with the increasing deviatoric plastic strain. To assess the reliability of the proposed approach, some comparisons with the results obtained using other constitutive models for soils with strain-softening behaviour are presented. Finally, a slope subjected to a prescribed process of weathering is considered, and the effects of this process on the slope stability are discussed. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码:710 / 722
页数:13
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