近距离交叉穿越地铁区间隧道地震响应影响研究

随着城市化进程的加速及城市地下空间的开发，地铁建设呈网络化，线路间相互交叉工况逐渐增多．为了对近距离交叉穿越地铁区间隧道的抗震设计提供参考，利用有限元软件ABAQUS，并采用时程分析法进行计算分析；对交叉穿越地铁隧道在不同距离下的地震响应进行了研究．结果表明:当上下正交隧道的净距<0.5倍隧道直径时，下部隧道对上部隧道地震响应的影响增大，在地铁抗震设计中应对上下正交隧道的距离进行考虑． 

Seismic response of subway tunnels crossing at short distance

With urbanization and development of urban underground space the metro network is becoming ever more complicated and subway tunnels are closely located and undercrossing each other．To provide some reference for the seismic design of subway tunnel crossing at short distance, ABAQUS and time history analysis method were used to analyze the seismic response of subway tunnels crossing at different distances．When the distance between upper and lower orthogonal tunnels is less than half of the tunnel diameter, the lower tunnel has increased influence on the seismic response of the upper tunnel．Distances between the upper and lower orthogonal tunnels should be considered critically in the seismic design of metro tunnel structure．