Abstract
With the development of modern geotechnical engineering practices such as the construction of high level radioactive waste repositories, exploitation and utilization of geothermal resources, energy-saving buildings and underground storage of CO2, research into the influence of temperature on the basic mechanical properties of unsaturated soils has become an important issue internationally. By using the work expression and considering the influence of temperature on the basic properties of unsaturated soils, the average soil skeleton stress, modified suction and temperature were selected as state variables of generalized forces in thermodynamics and the soil skeleton strain, saturation and entropy were chosen as state variables of generalized flows conjugate to the variables of generalized forces. Based on the nonlinear multi-field coupled model and by using existing experimental results, an elastic-plastic constitutive model of unsaturated soils under non-isothermal conditions was developed to analyze the influence of temperature on the deformation properties of unsaturated soils. The model was used to predict and analyze the influence of suction and temperature on the deformation properties of unsaturated soils under isotropic conditions, and was successfully verified using experimental results.
Highlights
With the development of modern geotechnical engineering practices such as the construction of high level radioactive waste repositories, exploitation and utilization of geothermal resources, energy-saving buildings and underground storage of CO2, research into the influence of temperature on the basic mechanical properties of unsaturated soils has become an important issue internationally
In many engineering construction practices such as the exploitation and utilization of geothermal resources, CO2 underground storage, highway sub-grade stability analysis, high-voltage cable burial and petroleum exploitation, research on the constitutive model of unsaturated soils under non-isothermal conditions is of important theoretical significance and application value
For the liquid phase, the plastic change of degree of saturation is given by the sum of any direct movement caused by yielding on the SI/SD curve itself and any coupled movement produced by yielding on the loading collapse (LC), loading yield (LY) or thermal yield (TY) curves
Summary
According to thermodynamic and multi-phase porous media theory, the selection of stress and strain variables should meet the requirements of the deformation work in unsaturated soils. We follow convention in unsaturated soil mechanics and neglect any changes in gas pressure, while the effect of temperature, both in deformation of the soil skeleton and in changes in the liquid phase, is considered. Within this context, the generalized stress and strain variables expressed by matrix takes the form:
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