Research On Dynamic Interaction Of The Combination Of Rubber-soil Foundation And Structure

In this paper,the rubber particles of waste tires are combined with soil to form rubber-soil mixture.Then the rubber-soil material is introduced into ordinary foundation to form rubber-soil foundation.Finally,the rubber-soil foundation and complex structure are combined to form rubber-soil foundation and structure system.In finite element analysis,the semi-infinite rubber-soil foundation is realized by using viscous-spring artificial boundary.The influence of radiation damping and traveling wave effect is considered.The equivalent load method is used in seismic wave input.The seismic wave input adopts the equivalent load method,the seismic wave input is equivalent to the load input on the artificial boundary node,and the coupling model of the rubber-soil foundation-structure system is established.under the dynamic action and seismic response,the variation law of the displacement of the observation point,displacement and acceleration time history and stress of the observation points of the foundation is detailed analysis analyzed.The work of this paper is as follows:(1)The two-dimensional finite element model is established by combining the rubber-soil foundation with the tunnel.Considering the influence of the depth,thickness,rubber content and tunnel shape of rubber soil layer in layered foundation under dynamic load,the displacement of observation of foundation is compared and analyzed.(2)The two-dimensional finite element model is established by combining the rubber-soil foundation with the dam.Under seismic response,the displacement time history and acceleration time history of the observation points on the structure of the dam are compared and analyzed in the models of the top and sub-layer,single and multi-layer,different thickness and different content of the rubber soil layer in the layered rubber soil foundation.(3)The three-dimensional finite element model is established by combining the rubber-soil foundation with the frame structure.Under seismic response,the influence of common ground foundation and rubber-soil foundation on frame structure is compared and analyzed.The following conclusions are drawn:(1)Foundation-tunnel system under dynamic load under the dynamic load,when the rubber soil layer is located at the top of the foundation,the optimal layer thickness is 4 meters,and when the layer thickness is more than 4 meters,the vertical displacement decreases with the increase of the layer thickness.The optimum content is 20% rubber and the horseshoe tunnel is the optimal tunnel shape.(2)Foundation-dam System under the seismic response,the structural displacement of rubber-soil foundation can attenuate 24.91%-41.57% compared with that of ordinary foundation,the sublayer rubber-soil foundation is the optimal working condition,the single layer rubber-soil foundation has better effect under seismic response,the vertical acceleration can attenuate 3.45%-22.74%,and the number of rubber soil layers has little effect on the displacement of the structure;when the thickness of rubber soil layer reaches 10 m,the shock absorption effect is better;and the rubber-soil foundation with 20% rubber content has the best seismic reduction effect.(3)Foundation-frame structure system under the seismic response,it is concluded that the rubber-soil foundation can reduce the displacement of the structure by 22.96% and the displacement angle of 0.1438%;the acceleration extreme value and the normal stress extreme value are easy to appear at the joint of the column.