Seismic Research Of Permanent Nuclear Waste Depot Made Of Hybrid Fiber Reinforced Concrete

Nuclear waste safety disposal is the bottleneck problem of sustainable development of nuclear energy. At present, there is not a country that has the absolute safety of nuclear waste storage technology. In recent years, nuclear leakage accidents always happen due to the earthquake. Because nuclear waste permanent storage is an important port of nuclear waste disposal site, its seismic performance is critical for service safety. Our country has two low level radioactive waste permanent storages all using plain concrete material. As everyone knows, ordinary concrete has the shortcomings of low tensile strength, brittle, easy to crack, and small damping coefficient. Recognized international, the fibers mixing in the concrete helps to overcome the innate defects of concrete material. Fiber reinforced concrete has good crack resistance and toughening properties. Although there are more applications of fiber concrete material extensively in engineering than before, but the research on its seismic performance is still in the initial stage, therefore, study on the seismic performance of hybrid fiber concrete storage structure is very necessary.we mix basalt fiber B and Dura fiber in concrete as a permanent nuclear waste storage material, and the elastic modulus and shear modulus of the material is determined according to the compressive strength of ordinary concrete and hybrid fiber reinforced concrete, in order to determine the reservoir parameters on modal analysis; Taking the Guangdong Beilong disposal field permanent nuclear waste storage as the research object, we analyze permanent nuclear waste storage base vibration characteristics based on the cantilever shear beam model. We conduct model analysis on plain concrete and hybrid fiber concrete nuclear waste permanent storage by using ABAQUS finite element software, determine the structure's natural vibration frequency and vibration type, and retain the relationship between wall thickness and vibration mode and frequency. The dynamic finite element analysis method is used to study nuclear waste permanent storage dynamic response under seismic load, and we can get plain concrete and hybrid fiber concrete nuclear waste permanent storage node displacement and stress under the action of horizontal and vertical ground motion. With the permanent nuclear waste storage's node displacement as the control parameter establishs nodal displacement function and obtain the reliability index.Comparative study of the two kinds of materials for permanent storage of seismic performance in this paper provides theoretical support to ensure that in the low level radioactive waste permanent storage is in security service, which lays the theoretical foundation for the fiber concrete structure's design and engineering application.