Analysis Of Temperature, Deformation And Stress Fields Of Nuclear Waste Repository In Salt Rock

With the rapid development of our economy, the energy of nuclear is more and more widely. There are more advantages than the other energy: the first is compared with other nuclear energy, it has high efficiency. In the same premise condition, nuclear energy emitted heat will be coal, oil, natural gas emitted heat near a hundredfold. The second is nuclear energy is a kind of clean energy. It is different of the other energy, it won't produce carbon dioxide and sulfur dioxide etc toxic substances when it consumes. But with the extensive use of nuclear energy, and it has produced a lot of waste. How to deal with these nuclear safely and perpetually became a world concerned.A lot of experiment and research proof that rock salt is most suitable for storage of nuclear waste one of several surrounding rock. Waste of radioactive elements in the process of decay, will be given off a lot of heat. The heat will make the repository of surrounding rock temperature rises to 100oC above. Such high temperature will make the repository of surrounding rock of the temperature field, deformation field and stress field change. If the crack expanded it will threaten repository security and stability.This paper is used thermodynamics, rock mechanics, creep and damage mechanics of nuclear waste disposal repository of the temperature field and thermal stress of theoretical analysis. Then use of nuclear waste disposal repository FLAC3D of temperature field,deformation field and thermal stress field is numerically simulated. This research and analysis of the main contents include the following respects:(1) Nuclear waste repository of the temperature field, deformation field and stress field is analyzed. And the disposal repository of surrounding rock, backfilling materials, artificial barriers were chosen and analysis. This paper narrates the rock salt has many advantages as repository of surrounding rock.(2) The thermodynamics, rock mechanics and creep mechanics, the corresponding contents of nuclear waste repository of the temperature field and stress field are analyzed in theory. Finally given a repository of temperature field, stress field, strain field calculation formula.(3) Using FLAC3D disposal repository of the temperature field is numerically simulated and analysis. Research found that the middle position disposal of roadway temperature than on both sides of the disposal of the disposal of roadway temperature field. And this paper discusses the disposal repository space on the influence of temperature. In disposing of roadway spacing into its temperature field 6m, superposition phenomenon was quite obvious. And disposal of roadway spacing 12m and 18m temperature field are little different.(4) Using FLAC3D disposal repository of the deformation field is numerically simulated and analyzed. Studying found repository of roadway wall and arched bottom have relatively large deformation. In tunnels arched bottom place has the larger mesh distortion. This is due to the repository arched bottom place has the displacement vector cause.(5) Using FLAC3D disposal repository of the stress field is numerically simulated and analyzed. Repository of maximum principal stress mainly distributed in the repository of surrounding rock near field. In the repository wall and arched bottom has appeared in tensile stress. We can explain repository deformation very well.