Response Analysis Of Subway Tunnel Under Seismic Stick-slip Of Active Fault

With the acceleration of urbanization in China,the number of urban population and the increase of motor vehicle ownership have led to the increasing problem of traffic congestion.At this time,the advantages of rail transit are gradually reflected,especially the subway.In this context,the country set off a subway construction boom,in the site construction process will inevitably encounter a variety of seismic activity fault zone,to explore the tunnel structure through the seismic activity of the fault zone Seismic sticky slip response is necessary.Based on the combination of theoretical analysis and numerical simulation,ABAQUS finite element software is used to calculate the prototype of the Nanchi Bay No.2 fault south branch of Urumqi Metro Line 2 tunnel.The seismic structure of the tunnel lining is analyzed in seismic load and fault displacement Under the law of force.By further summarizing,(1)The stress characteristics of the tunnel through the normal fault,the reverse fault and the strike-slip fault are: the failure of the lining structure in the normal fault is the failure of the lining,and the failure of the lining structure in the reverse fault is pressure failure,Arch at the end to withstand greater shear and damage.(2)In the selected condition,the calculated fault is more destructive than the seismic inertia force by calculating the contrast.(3)Compared with the integral tunnel lining structure,the section of the secondary lining can improve the anti-misalignment performance,but the initial and secondary lining staggered set section of the seam to improve its anti-error performance is not obvious.(4)to increase the thickness of the secondary lining of the affected area,can reduce the tensile stress peak of the lining,but at the same time the shear stress will be significantly increased,more susceptible to shear damage.