›› 2013, Vol. 34 ›› Issue (8): 2189-2194.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

A constitutive model of unsaturated soils with high saturation

LIU Yan1, 2, WEI Chang-fu1, ZHAO Cheng-gang2, FANG Qian2   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
  • Received:2012-07-30 Online:2013-08-12 Published:2013-08-13

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Abstract: In unsaturated soils with high saturation, gas phase is disconnected, and the occluded gas pressure may change and affect the soil behavior. The properties of unsaturated soils with high saturation are first discussed; and then a constitutive model is developed within an existing constitutive framework of unsaturated soils by using the principle of generalized effective stress. This model takes into account the effect of gas diffusion, with a hardening law accounting for the effect of occluded gas pressure change. To validate the new model, the modeling results are compared with the experimental results available in the literature and the simulated results of existing models. It is shown that this model performs better than existing models, especially for the unsaturated soils at high saturation.

Key words: high saturation, occluded gas, constitutive model, unsaturated soils, principle of generalized effective stress

CLC Number: 

  • TU 443
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