Volume change behavior of unsaturated soils under non-isothermal conditions  

作　　者：CAI GuoQing ZHAO ChengGang LIU Yan LI Jian 

机构地区：[1]Department of Geotechnical and Geoenvironmental Engineering, School of Civil Engineering and Architecture, Beijing Jiaotong University,Beijing 100044, China

出　　处：《Chinese Science Bulletin》2011年第23期2495-2504,共10页

基　　金：supported by the National Natural Science Foundation of China (51078019);the National Basic Research Program of China (2010CB732100);Beijing Municipal Natural Science Foundation (8112024);the Basic Research Funds for the Central Universities (2011YJS043)

摘　　要：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 CO 2 , 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.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 interna- tionally. 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 ther- modynamics 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 mtdti-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 veri- fied using experimental results.

关 键 词：非饱和土 非等温条件 高放射性废物处置库 弹塑性本构模型 行为 体积 状态变量 耦合模型 

分 类 号：TU411[建筑科学—岩土工程]