A constitutive model of unsaturated soils with high saturation

作者：Liu Yan; Wei Chang Fu^*; Zhao Cheng Gang; Fang Qian

来源：Yantu Lixue/rock and Soil Mechanics, 2013, 34(8): 2189-2194.

• Effective stress
• Gas diffusion
• Gas pressures
• Hardening laws
• Model results
• Simulated results
• Soil behaviors
• Unsaturated soil

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.

• 单位
  北京交通大学