The Research Of Tunnel Dynamic Response Of Active Fault Zone

With the rapid development of infrastructure construction in our country, some highway, railway tunnels and underground railway projects are encountered with problems that pass through active seismic fault zone. When the tunnels pass through seismic active fault zone, structures need to have the ability to with stand earthquake and activities of fault dislocation, which should be able to meet the security requirements that large earthquake does not make them collapse, then after the earthquake, they can be repaired. The interaction relationship between structure under the action of earthquake and surrounding rock of fault, and the disaster control method of fault size dislocation structure after the earthquake, are all new challenges to the industry. Now anti-seismic, shock absorption problems become new problems and new directions of underground engineering.This paper uses model experiment and numerical analysis method, and combined with the Urumqi metro safety evaluation report, analyzes engineering characteristics of active seismic fault zone, strata and dynamic response of tunnel structure, and determine the role of toroidal shock absorption seam damping and toroidal shock absorption seam tunnel structure parameters on the influence law of seismic performance of lining.Through above analysis, it can be concluded as follows:(1)Seismic zone and active fault are closely related to the origin. The effect of active fault is also the root reason of causing distribution of earthquakes and earthquake zones.(2)The model experiment shows that under the action of earthquake fault fracture zone is not broken strata 71% higher seismic displacement, setting damping joint can reduce stress significantly on the tunnel lining,shock absorption slot can make the stress of tunnel lining reduced greatly. The maximum tensile stress is reduced by 60.9%, and the maximum compressive stress is reduced by 68.8%.(3) the numerical simulation results show that under the action of earthquake fault fracture zone is not broken strata 76% higher seismic displacement, the maximum tensile stress of tunnel lining is reduced by 65.7%, and the maximum shear stress is reduced by 16.8%, but it has less effect on the displacement and acceleration response of lining.