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《Chinese Journal of Underground Space and Engineering》 2013-03
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Seismic Response Simulation of Underground Cavern Group Based on Quasi-Static Method

Zhang Yumin1,Yang Jihua2,Cui Zhen3,Zhu Zeqi3(1.School of Resource and Environment,North China University of Water Conservancy and Hydroelectric Power,Zhengzhou 450045, China;2.Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou 450003,China;3.China State Key Laboratory of Geomechanics and Geo-technical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)  
The two-dimensional simulation model of underground cavern group of Baihetan Hydroelectric Station is established by the finite element software of Phase2.The deformation and stress fields of underground cavern group under different seismic accelerations are simulated by the quasi-static method.The results show that the displacements,stress of key points around caverns and relative displacements of side wall of the cavern differ under different seismic input direction.Under-0.34 g accelerations,the displacement of top arch of tailrace surge chamber is 34.5cm,and the relative displacement between two walls is 12.2cm.Under 0.34g acceleration,the stress concentration occurs in top arch of tailrace surge chamber,with 12.8MPa increase in max stress,which has adverse effect on stability of tailrace surge chamber.
【Fund】: 国家自然科学基金重大研究计划资助项目(No.90715042);; 华北水利水电学院高层次人才科研启动项目
【CateGory Index】: TV731.6;TV312
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