Seismic Performance Analysis Of Rubber Sand Isolation Cushion

In the earthquakes such as the Yibin earthquake,the Zhaigou earthquake,and the Pishan earthquake in Xinjiang,the low-rise and multi-storey buildings in townships are seriously damaged,and the isolation and isolation is a low-cost and effective method.The number of used tires has increased dramatically,which is difficult to handle and has caused many problems.However,after the waste tire powder is not mixed with sand,it has good seismic isolation performance.Therefore,the study of rubber sand cushion can better solve the earthquake resistance of township buildings,and can solve the environmental problems caused by used tires.In this paper,the seismic isolation performance of the rubber sand cushion foundation under seismic excitation is studied,based on the triaxiality of the actual site earthquake.Self-made,and analyze the performance of three-dimensional circular laminated shear model soil box.The three-dimensional circular laminated shear model soil box is used to analyze the three-way seismic isolation of the rubber sand cushion foundation.The main research contents are as follows:(1)Based on the working principle of the seismic isolation cushion,the reasons for the seismic isolation effect of the rubber sand isolation cushion and the influence factors and formulas are analyzed and derived.(2)Using the dynamic triaxial test,the possibility analysis of the seismic isolation effect of the rubber sand isolation cushion is carried out,the kinetic parameters are measured,and the dynamic characteristics of the rubber powder content of the rubber sand are tested.The rubber sand damping ratio increases with increasing rubber powder content from 0% to 30% of the mass of the rubber powder and sand mixture;and when the content is between 30% and 40%,it is subsequently reduced.Small;between 30% and 40%,a maximum shock absorption and isolation effect value can be obtained.(3)Based on the free-field shaker test,the three-dimensional circular laminated shear model soil box is analyzed by seismic response,which can simulate the real effect and performance of the real infinite boundary condition.(4)Using the vibration table test with and without rubber sand isolation pad to compare and analyze the seismic isolation performance of the rubber sand cushion foundation,and analyze the influence of the superstructure model on the isolation and isolation,and use the settlement to determine the application feasibility analysis.It shows that rubber sand has good three-way isolation and shock absorption effect;and the maximum seismic isolation efficiency can reach 57.2%,the average seismic isolation efficiency is above 20;and the foundation settlement is very small,about 0,rubber sand isolation cushion Can be well applied in engineering practice.