Hydromechanical Constitutive Model for Unsaturated Soils with Different Overconsolidation Ratios

论文类型：

期刊论文

第一作者：

Li, Wugang

通讯作者：

Yang, Q (reprint author), Dalian Univ Technol, State Key Lab Coastal & Offshore Engn, Dalian 116023, Peoples R China.

合写作者：

Yang, Qing

发表时间：

2018-02-01

发表刊物：

INTERNATIONAL JOURNAL OF GEOMECHANICS

收录刊物：

Scopus、EI、SCIE

文献类型：

J

卷号：

18

期号：

2

ISSN号：

1532-3641

关键字：

Overconsolidation; Unsaturated soils; Constitutive model; Degree of saturation; Suction

摘要：

Overconsolidated unsaturated soils emerge in many engineering problems. This article presents a constitutive model for unsaturated soils using skeleton stress and degree of saturation as fundamental variables. A subloading surface is introduced into the framework to interpret the effect of overconsolidation on the coupled hydromechanical behavior of overconsolidated unsaturated soils. The main advantage of the proposed model is that it is capable of reproducing the hydromechanical behavior of unsaturated soils with different initial overconsolidation ratios, such as the overconsolidation effect on the shearing-induced saturation change. The material parameters of the proposed model can be calibrated through conventional tests. Numerical studies were conducted to assess the performance of the model for a fictional silt under two typical scenarios. The validity of the proposed model was confirmed by experimental results for both isotropic and triaxial conditions reported in the literature.