Dynamic Interaction Analysis Of Soil-Underground And Ground Structure

There are great differences between ground structure and ground structure in seismic response: ground structure dynamic response is mainly produced by its own inertia;while underground structure is restrained by surrounding soil and coordinated movement with surrounding soil,at the same time,the interaction between soil and underground structure will have a greater impact on ground structure seismic response.The resulting structure-soil-structure interaction makes the seismic response of the dynamic interaction system between underground structure and adjacent buildings very complex.Based on the analysis and summary of the previous research results,the finite element analysis of different types of underground structures and the interaction system between underground structures and adjacent underground(upper)structures is carried out based on the large-scale general finite element software ABAQUS.The seismic response of underground structures and the law of structure-soil-structure interaction are studied.The specific contents are summarized as follows:1.In this paper,the numerical simulation method,shaking table test method and analytical method for the study of earthquake resistance and structure-soil-structure interaction of underground structures are systematically summarized and sorted out.In particular,the method of numerical simulation of seismic response of underground structures is introduced in detail,the recent research is summarized,and the future development trend is reviewed.2.This paper systematically introduces the general finite element software ABAQUS for analysis and its explicit implicit dynamic calculation module,and introduces the viscous artificial boundary which is suitable for the calculation in this paper.The free field and dynamic response of soil layer are analyzed by software ABAQUS.3.This paper introduces the modeling method of the whole seismic response analysis model of underground structure and adjacent soil,and the selection method of model parameters.Three typical underground structures,circular tunnel,single-storey two-span rectangular metro station and two-storey three-span rectangular Metro station,are selected to establish the finite element model.The dynamic explicit algorithm is used to solve the model.The structural internal force characteristics of underground structure under seismic load and its influence on the surrounding seismic field are analyzed.4.Four typical interaction systems between underground structure and adjacent underground(upper)structures are selected for finite element numerical simulation: two circular tunnel interaction system,two rectangular subway station interaction system,circular tunnel and rectangular station interaction system,rectangular subway station and high-rise frame structure interaction system.By comparing the results of seismic response analysis of interaction system with those of single structure,the influence of structure-soil-structure interaction on internal force distribution and the influence of structure spacing on structure-soil-structure interaction are obtained.Through the above analysis,the disadvantageous section and avoidance distance of the structure are obtained when the interaction occurs in engineering practice.