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In this paper, the influence of the fractured zone on the underground structure under seismic action is studied. The research project is located at 250m near a large fault. After the earthquake, the fault vertical elevation is about 3.5m, and the horizontal dislocation is 2~3m. The secondary fracture zone appears in the project. In this paper, MIDAS/GTS software is applied to simulate horizontal and vertical displacement fields of large faults, simulating the fractured zone generated by earthquakes in the way of weak layers. The influence of the secondary breakup zone on the engineering is simulated. The displacement of the fractured zone has great influence on the displacement of the structure, and the displacement for the footwall structure increases obviously, while the displacement for the upper wall structure decreases compared with the non broken zone. The appearance of the broken zone absorbs most of the energy to the distal end and reduces the damage of the distal end.

Finite Element Analysis of Influence of Broken Zone on Underground Structure Caused by Earthquake