Study On Seismic Joint And Related Structure Construction In Tunnel Shock Absorption

With the continuous advance of the western development strategy, a largenumber of roads, railways and other transportation facilities are built one afteranother，However, the southwest area of our country set in the Eurasian earthquakebelt, the project built in the region will be affected by the high-intensity earthquakezone and the fault zone is inevitable. Therefore, the underground structures under highseismic intensity response is extremely engineering significance and socio-economicvalue, So, the structure of shock absorption studies is the key to achieve this goal.The content of thesis researched as follows:(1) paper collate and analyze earthquake damage information of tunnel and underground engineering at home and abroad, then, based on the existing survey results, summarized the failure mechanism and seismic impact factors of the mountain tunnel.(2) By analyzing the tunnel set up seismic joint or not and the tunnel set different spacing seismic joints, research the law of tunnel anti-damping effect by seismic joint.(3) On the basis of the study the tunnel longitudinal earthquake influence by fault zone dip, analysis the anti-damping effect by set different spacing seismic joints.Analysis showed that:(1) Tunnel set up seismic seam in high-intensity earth quakezone, with a significant damping effect. With the seismic slit spacing decreases, structural internal force and displacement decreases gradually, but, when the space is5m, the damping effect about displacement is not significantly.(2) Change the elastic modulus of seismic seam grouting material, When less than1.0MPa, the damping effect about internal forces is lowing.(3) The inclination of the fault fracture zone had agreater influence to seismic dynamic response of the tunnel, when the inclination is45°, fault impact on the displacement and the internal force peak of tunnel isthe largest, the inclination is the most unfavorable position. When the inclination is90°, the impact of faul is less. The tunnel across the fault, after setting seismic joints, the longitudinal extent of fault on the tunnel lining reduced, the displacements and internal forces have been effectively reduced also.