Experimental Study On The Heat-Solid Coupling Characteristics Of Granite

High-level radioactive waste repository from excavation, construction, joint, monitoring, and complete their service life long, in the process of decay of high-level radioactive waste will continue to produce a large amount of heat, leading to high level radioactive waste disposal in the near field of surrounding rock, the rise of temperature of surrounding rock caused by stress redistribution. Surrounding rock under the action of high temperature may produce new cracks, and the potential of the fracture become nuclide leak channels. As a result, the safety of the high-level radioactive waste disposal is a affect the sustainable development of nuclear power, environmental protection and future generations well-being of major issues, seek safe and effective, permanent disposal of high-level radioactive waste issue is one of the more urgent task in our country. Evaluation of the physical and mechanical properties of the rock and the radiant heat under the long-term effects of performance is very important to the safety of the disposal repository, these parameters are also underground laboratory and site evaluation, the future disposal repository design and build the necessary basic information.Due to the excavation and construction of underground storage sites, as well as the chemistry of high-level radioactive waste, the underground disposal of radioactive waste must take into account the following various hot- solid coupling interaction in the process of: 1) due to the decay of high-level radioactive waste heat release process caused by the changes in thermal parameters of rock mass, and the resulting fracture degree of change in the sample. 2) in the process of excavation of high-level radioactive waste caused by the change of the degree of rock fracture rock specimens and the corresponding reaction of thermal parameters change;Through the above account, set up from the physical and chemical mechanical mechanism can really reflect the high level radioactive waste disposal granite fissure thermal stress(M)(T)- coupling mechanism of the theoretical model and analysis method is still very important. This paper mainly analyzes the temperature on the sample of the thermal parameters and mechanical properties of triaxial compression test impact study, main experiment content is as follows:1) complete and rock mineral composition and the element content analysis after heat treatment2) complete and thermal parameters determined by test on granite specimens after heat treatment, measured the thermal expansion coefficient, heat transfer coefficient of granite and thermal parameters such as heat capacity.3) complete and granite after heat treatment for triaxial compression test, the measured temperature effect on the mechanical properties of granite.The results of the study concluded that: the experimental granite stone is mainly composed of potassium feldspar, sodium feldspar, mica, quartz and a small amount of chlorite and calcite. With the increase of temperature, a complete sample and the heat capacity of the sample after heat treatment, the axial expansion coefficient and thermal conductivity coefficient value increase. Through the triaxial test found that within 300 temperature has a little influence on ℃mechanical properties of granite.