Study On Seismic Dynamic Response Of Parallel Underground Structure And Its Engineering Measures

The great development of underground space has dominated the urban growth along with increasingly intensive superficial layer underground resources.Therefore,the construction of more and more newly-built subway stations has to be next to existing underground structures,which forms parallel underground structures.The particularity of parallel underground structures compared with single underground structure,contributes to the differences in seismic dynamic response and weak parts between the parallel and the single.It is necessary to analyze the seismic dynamic response of parallel underground structure in order to evaluate the safety assessment of parallel underground structure when being stricken by the earthquake and propose effective countermeasures.Taking the project about a certain subway station parafocal and parallel to a certain municipal tunnel as research object,this essay analyzes the seismic dynamic response discipline of parallel structure,studies the weak parts of parallel structure when being stricken by the earthquake,and conducts comparison and selection of countermeasures against the weak parts.The research results of this essay is as follows:(1)Conduct researches on the parallel underground structure under different seismic waves and parallel distance cross-combination operating conditions,analyze displacement time history and stress time history of parallel underground structure,in order to understand the interaction between parallel underground structure and its seismic dynamic response and the seismic dynamic response discipline of parallel underground structure.(2)Comparatively study the calculation results of parallel distance operating conditions under different unfavorable seismic incident angles,and analyze the displacement time history and internal force time history of parallel structure to determine the weak parts of parallel structure and the difference between the parallel structure and single underground structure as well as evaluate its safety.(3)Study the parallel structure under different earthquake-resistant countermeasures,analyze the displacement time history and internal force time history of its weak parts,comprehensively compare its security assessment index,to conclude effective earthquake-resistant countermeasures and evaluate its safety.