Seismic response of tunnel under normal fault slips by shaking table test technique
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Seismic response of tunnel under normal fault slips by shaking table test technique FAN Ling(樊玲), CHEN Jie-ling(陈捷翎), PENG Shu-quan(彭述权), QI Bin-xi(祁彬溪), ZHOU Qi-wen(周启文), WANG Fan(王凡) School of Resource and Safety Engineering, Central South University, Changsha 410083, China © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: Mountain tunnel crossing a normal fault in seismically active zone is easily affected by normal fault slip and earthquake. It is necessary to study tunnel dynamic response under action of normal fault slip and earthquake. In this paper, a three-dimensional normal fault sliding device was designed, and a shaking table test was carried out to study tunnel seismic performance under normal fault slip. The results show that peak acceleration of lining is dominated by an existence of fault and direction of seismic excitation, not normal fault slip. And the incremental strains of lining in critical zone with 1.7 times fault thickness and centered in faults induced by normal fault slip and seismic excitation are larger than ones only by seismic excitation. And the incremental strains in critical zone increase with the increase of normal fault slip magnitude ranging from 0 to 2 mm. And normal fault slip results in a significant reduction of overall tunnel stiffness subjected to an earthquake. These experimental results provide a scientific reference for prevention and control measurement of tunnel damage under earthquake and normal fault slip. Key words: tunnel; normal fault; earthquake; fault slip; shaking table test; peak acceleration Cite this article as: FAN Ling, CHEN Jie-ling, PENG Shu-quan, QI Bin-xi, ZHOU Qi-wen, WANG Fan. Seismic response of tunnel under normal fault slips by shaking table test technique [J]. Journal of Central South University, 2020, 27(4): 1306−1319. DOI: https://doi.org/10.1007/s11771-020-4368-0.
1 Introduction East African Great Rift Valley is seismically active zone, with many slipping normal faults, as well as Qinghai-Tibet Plateau [1, 2]. Most of railway tunnels and road tunnels constructed in these areas, such as Nahma railway project and Sichuan-Tibet railway, are lifelines engineering. And these tunnels cannot avoid fault and will be subject to earthquake activity with a high probability. The earthquake damage of tunnel will bring great trouble to the rescue work of these areas. In recent years, some surveys of earthquake damage of building show that the tunnel near or crossing
fault zone is more easily damaged in seismically active zones such as Wenchuan, Chi-chi, Kobe [3−6]. The normal fault slipping is caused by tectonic stress or earthquake and results in permanent fault dislocation. This may induce tunnel failure or intensify the seismic damage of tunnel. For crossing fault tunnel, tunnel elevation successive severe damage located in faulting zone happens when normal fault slips, and segmental tunnel maybe more easily dissipates normal fault slip effect than continuous one [7−9]. The failure mode of tunnel c
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