SEISMIC DAMAGE MECHANISM OF METRO TUNNELS THROUGH ACTIVE GROUND FISSURS
LIU Nina1,2,PENG Jianbing1,2,HANG Dongdong1,HUANG Qiangbing1,2,MEN Yuming1,2,SHI Yuling1,2
(1. School of Geology Engineering and Surveying,Chang?an University,Xi?an,Shaanxi 710054,China;2. Key Laboratory of Western Mineral Resources and Geological Engineering of Ministry of Education,Chang?an University,Xi?an,Shaanxi 710054,China)
Abstract:Based on the construction of the Xi?an metro tunnel which passes through active ground fissures,it is the first time that the dynamic responses of the horseshoe shape metro tunnel in the seismic loads are studied by the shaking table test. The research focuses on the acceleration,earth pressure and the strain of the tunnel. The test results show that with the dynamic load,uneven settlements and scarps come into being in the seismic load,and the deepest points are along the fissure. The settlement of the hanging wall is larger than that in the footwall. There are cracks of the soil upon the tunnel appear after the seismic loads. The accelerations along the tunnel are similar in every points show that the tunnel is a unity. The acceleration of the hanging wall is larger than that in the footwall;this shows that the hanging wall has the character of expanded the seismic loads. The earth pressure curves show the value and direction changed with the seismic loads,the earth pressure of the middle of the arched is the biggest,the secondary is the points of the bottom of the floor,and the top of the arched is the least one. These findings are of great importance to the rational understanding of earthquake behaviors of metro tunnels through active ground fissure zones,and they may provide earthquake resistant design and construction of practical projects
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