Numerical Simulation Of Coupling Thermal-hydraulic-mechanical Behaviors In Unsaturared Bentonite

now a days, in the area of civil engineering and hydraulic power, such as how to deal with the roadbed in frozen earth; in the area of natural resources, such as gasification of coal underground;in the area of environmental engineering, such as to dispose of high level radio power waste.different physic field influence or iteractive with each other in the surroundings, especially the main part-unsaturated soil, whose physicochemical prorerty affected by temperature field, seepage field and stress field a lot. So the study of multi-field coupled seems very important, and also become an important task gradually. Which also provide very important reference to engineering practice.Yet, with the application of the numerical solution in research and engineering gradually maturity, which bring a great benefit to the study in multi-field coupled. However, the lagging of the software development causes most of the domestic study focous on concrete issue, which has limitations to the solution of most problems. Based on the model of high-level radioactive conceptual nuclear waste repository, by using business software-ABAQUS, to study the progress of the homogenization of cushion material-unsaturated bentonite, which include:(1) Gave an outline of the thermodynamics, hydraulics, mechanics of the unsaturated soil and its coupled manners, according to what may study next, we fixed sequential coupled methods and deduce coupled field mathematical equations.(2) By using ABAQUS to conduct water taking simulation experiment, then gave the figure of convergence of the water ratio versus distance, compare the result with the real experiment value, which proves ABAQUS has a outstanding reliability and veracity.(3) Based on the model of high-level radioactive conceptual nuclear waste repository, to study the Thermal-Hydro coupled behavior in unsaturated bentonite, and then gave the directional distribution figure of the degree of saturation, stress, displacement and the plots of above parameters versus the time, at last, compare and analyze the sensibility of the important parameters in the progress, obtain the conclusion that the period of initial and final saturation both sensitive to osmotic coefficient.(4) On the foundation of the former chapter, considering the temperature field of nuclide disintegration, to analyze the Thermal-Hydro-Mechanical coupled behavior in the unsaturated bentonite, then gave the directional distribution figure of degree of saturation, pore water pressure, stress, suction and the curve of parameters above versus the time, compare with the result from the fourth chapter, analyze the influence of the temperature to hydraulics and mechanics factor, obtain the conclusion that the influence of the temperature field to hydraulic factor is bigger than mechanics factor.