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《Chinese Journal of Underground Space and Engineering》 2012-01
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Shaking Table Test Studies of Failure Mechanism of Unlined Loess Tunnel under Earthquake

Zheng Yingren1,2,Xiao Qiang1,2,3,Xin Jianping1,2,Feng Xiating4(1.Department of Architectural Engineering,Logistical Engineering University of PLA,Chongqing 400041,China;2.Chongqing Engineering and Technology Research Center of Geological Hazard Prevention and Treatment,Chongqing 400041,China;3.Department of the Academy of Military Medical Science,Beijing 100086,China;4.Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)  
A large-scale shaking table test of loess unlined tunnel is done after relevant literature consulting,and numerical simulation analysis.Shaking table test results show that: the deeper the depth the smaller peak acceleration,the tunnels and underground structures with shallow depth need to reinforce earthquake resistance measures;tunnel entrance department will have greater change in peak acceleration dueto its rigidity.Compared to other locations along the tunnel the seismic standards,in the tunnel entrance area within a certain range;should been hanced tunnel in the lower part of vertical wall is the most easily damaged parts and the tensile cracks of tunnel invert will appear at first,and eventually the two parts will be formed connected destroyed areas;the measured peak acceleration curve is more smooth when the input peak acceleration is more than 0.8 g,the surrounding rock is plastic when a turning point appears at the input peak acceleration in 0.8 g.The numerical simulation analysis of the shaking table test shows that:the safety factor of the tunnel is 1.07 when the input peak acceleration is 0.9 g,but the safety factor of the tunnel is less than 1.0 when the input peak acceleration is 1.0 g,then the tunnel damaged.The shaking table test and numerical simulation all show that loess unlined tunnel has strong anti-seismic performance.
【Fund】: 国家重点基础研究发展计划(973)项目(2010CB732100);; 重庆市自然科学基金资助项目(CSTC.2009BL0002)
【CateGory Index】: U451.5
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