A constitutive model for unsaturated soils with consideration of inter-particle bonding

被引:43
作者
Hu, Ran [1 ,2 ]
Liu, Hui-Hai [3 ]
Chen, Yifeng [1 ,2 ]
Zhou, Chuangbing [1 ,2 ]
Gallipoli, Domenico [4 ]
机构
[1] Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China
[2] Wuhan Univ, Minist Educ, Key Lab Rock Mech Hydraul Struct Engn, Wuhan 430072, Peoples R China
[3] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Earth Sci, Berkeley, CA 94720 USA
[4] Univ Pau & Pays Adour, Lab SIAME, F-64010 Pau, France
基金
中国国家自然科学基金;
关键词
Constitutive model; Unsaturated soils; Bonding effect; Water menisci; Plasticity; Critical state; STRESS-STRAIN BEHAVIOR; ELASTOPLASTIC MODEL; CAPILLARY STRESS; WATER-RETENTION; HYSTERESIS; SATURATION; FRAMEWORK; STRENGTH; SUCTION; VOLUME;
D O I
10.1016/j.compgeo.2014.03.007
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
The paper presents a physically-based constitutive model for unsaturated soils that considers the bonding effect of water menisci at inter-particle contacts. A bonding factor has been used to represent the magnitude of the equivalent bonding stress, defined as the bonding force per unit cross-sectional area. The average skeleton stress is employed to represent the effect of average fluid pressures within soil pores. Based on an empirical relationship between the bonding factor zeta and the ratio e/e(s) (where e and e(s) are void ratios at unsaturated and saturated states, respectively, at the same average skeleton stress), we propose an elasto-plastic constitutive model for isotropic stress states, and then extend this model to triaxial stress states within the framework of critical state soil mechanics. Because only one yield surface is needed in the proposed model, a relatively small number of parameters are required. Comparisons between experimental data and model results show that, in most cases, the proposed model can reasonably capture the important features of unsaturated soil behavior. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:127 / 144
页数:18
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