Seismic Analysis of the Radioactive Waste Geological Repository Structure
|School||Harbin Engineering University|
|Keywords||Geological repository of radioactive waste Underground seismic Design ground motion Triaxial test Triaxial test Seismic analysis|
Steel container containing radioactive material needs to be disposed of in accordance with similar high-level radioactive waste disposal requirements, and required a longer rhythm treatment of such wastes may reach thousands of years, during which the earthquake affecting the safety of waste repositories, a important random events, the storage structure of the seismic study is of great significance. High-level radioactive waste address repository has two important features: built deep underground rock and long-term radioactive effectively closed. Which determines the seismic analysis of structures of the two main issues: the need to identify the deep underground area of ??ground motion parameters; structural dynamic analysis process need to consider the complex structure of the radiation shield. Research and seismologists of existing underground seismic motion parameter variation on deep underground to research, deep underground hard rock site ground motion parameters variation. Some basic principles to determine the high-level radioactive waste geological repository design ground motion parameters. According to these basic principles, structure location, design ground motion parameters; or design ground motion parameters and the corresponding design earthquake ground motion parameters through similar venues research structure where the ground with depth variation, indirect role in structural design ground motion parameters. Based on the above principles, the optimal choice from the existing strong motion records be met waste storage structure design of site conditions and the depth of ground motion recorded at 00:05 on October 18, 1989 Loma Prieta earthquake. Then, according to the basic physical properties of the bentonite and lightweight aggregate concrete, the theoretical analysis of the constitutive model for these two materials, determined using the Mohr-Coulomb constitutive model to describe the mechanical behavior of these two materials. Triaxial and rock triaxial apparatus test, the corresponding parameters of the two materials, bentonite friction angle of 23.7 °, cohesion 145.7kPa; lightweight aggregate concrete friction angle of 7.4 °, the cohesion of 4.8MPa. Finally, the model can be simplified and the use of finite element software ABAQUS waste storage structure dynamic response analysis, mass, lightweight aggregate concrete, bentonite and the interaction of the steel container is considered in the calculation model, focusing on the earthquake bentonite layer displacement changes. Studies have shown that the strong motion records selected load speed, acceleration and displacement load is relatively small impact on the structure; steel container bound by state shield structure, not only affects bentonite shield layer and other layers The relative position may also affect the mechanical safety of the top of the concrete cover. The results of this study the seismic design and shielding design for high-level radioactive waste repository has the reference value.