Near-fault Subway Tunnel Numerical Simulation Study Of The Seismic Dynamic Response

In recent years, with the city's worsening traffic conditions, the Subway have become increasingly important in city's engineering construction, and China is most earthquake high-incidence area, and many underground structures built in fault zones and the region which occurs earthquakes frequently. How to ensure that the Mass Transit Railway tunnel project in the normal function of earthquake have great practical significance. Therefore, the study of seismic dynamic response of subway tunnel near the fault and anti-damping measures is important. Based in Guangzhou subway tunnel for the study, we use the finite difference software FLAC-3D to do subway tunnel near the fault numerical simulation of anti-damping, theses include the following sections:1. Summarize the development survey of underground structure anti-seismic and the development of the anti-seismic calculation theory of underground structure. Sum up all kinds of research measure and calculation theory of underground structures anti-seismic home and abroad. Summarize the principle of the finite difference method which this discourse uses.2. Through the comparative analysis of different horizontal calculation rang of the model which is 4,6,8 times tunnel diameter and different Constraints such as rigid constraint, free constraint and viscous constraint, we get the reasonable modal of horizontal calculation rang of 6 times tunnel diameter and viscous constraint.3. Research the rock characteristics between free site and tunnel site and seismic dynamic response of the tunnel with different seismic intensity, different direction of seismic input and different lining stiffness. Find that vault is the weakest part of tunnel in earthquake and X, Z direction is the most dangerous seismic wave direction.4. Summarize predecessors' research of tunnel damping measures. Research the effect of tunnel damping measures with setting horizontal and longitudinal damping layer, changing the lining stiffness. Discuss optimization of tunnel damping measures.5. Comparative analysis dislocation of the impact of the tunnel when there is different distance between tunnel and fault. Discuss the safe distance between tunnel and fault and get 100 meter safe.