1、 內蒙古科技大學碩士學位論文IIAbstract AbstractIn recent years, shield tunnel has become the main mode of subway engineering.Because of its small stiffness and easily to be destroyed during earthquake, the study ofseismic response of

2、 structure is of great significance. The common spatial combinationforms of two tunnels are parallel and crossing in subway engineering. Compared with thesingle line tunnel, the interaction between two tunnels need to be

3、 considered, which resultsin an complex seismic problem. Therefore, the dynamic response law and improveddesign method of double shield tunnels need to be further studied.In the 03 section project of Beijing metro line 1

4、7, two shield tunnels are graduallytransited from parallel to vertical, and form a complex combination of underground space;Based on above project, the following questions need to be studied. They are seismicresponse of

5、double shield tunnels in different spatial combinations, proposition of theimproved response deformation method and seismic safety evaluation of shield tunnels.The principal study contents and conclusion are as follows:F

6、irstly, the basic content of modeling in dynamic time-history analysis method andthe solving process in response deformation method are introduced, which can be used torapidly calculate seismic response of shield tunnels

7、. The seismic measures and dampingmechanism of tunnel structure are expounded, which provides design basis for seismicperformance optimization of shield tunnel.Secondly, the finite element analysis software Midas-NX is u

8、sed to simulate andanalyze seismic response of double shield tunnels and surrounding soil in different spatialcombinations, in order to reveal the interaction mechanism of tunnel-soil-tunnel system.Then universal law is

9、summed up, which is of great significance to the seismic design andconstruction of the project.Thirdly, based on finite element structural analysis software SAP84, the improvedresponse deformation method for aseismic ana

10、lysis of double-horizontal-paralleled shieldtunnels cross section is proposed. which is combined with fundamental principle ofresponse deformation method. In the improved method, interlaid soil spring connectingtwo tunne