地铁交叉隧道近场强地震反应特性的三维精细化非线性有限元分析
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摘要
基于ABAQUS软件研发的显式有限元并行计算集群平台,建立地铁双层交叉隧道结构的三维精细化有限元分析模型,研究了近场强地震动作用下地铁双层交叉隧道的三维非线性地震反应特性,并与浅埋/深埋单层隧道的地震反应特性进行了比较,结果表明:双层隧道的相互作用效应对上、下层隧道顶、底部之间的相对水平位移差具有放大作用;对上、下层隧道的地震应力反应有减小作用;双层隧道上、下层左侧的地震应力反应大于右侧的地震应力反应,隧道拱肩和拱腰处的应力反应明显大于其他部位,拱肩为隧道结构的最危险部位;双层隧道下层顶、底部的峰值加速度反应大于上层顶、底部的峰值加速度反应;双层隧道相互作用效应对上、下层隧道地震反应的影响与双层隧道的交叉形式和基岩输入的近场强地震动特性有关。
According to the explicit finite element method of ABAQUS and 32 CPU parallel computing cluster platform of the research group,a three-dimensional refined finite element model for cross tunnels is established and used to research the 3D nonlinear seismic response of cross tunnels under near-field strong ground motion and compare the results with that of one-layer upper/lower tunnels. The results show that:compared with a single deep/shallow-buried tunnels,for any one-layer upper/under tunnel of intersecting metro tunnels,the relative horizontal displacement difference of the tunnel top and bottom is magnified; and the seismic stress of intersecting tunnels is reduced; the seismic stress on the left side of tunnels is larger than that of the right side; and the seismic stress of tunnel spandrel and hance is significantly greater than that of other parts; and the tunnel spandrel is the most dangerous part of the tunnel structure. The acceleration response of top and bottom at the under tunnel of intersecting metro tunnels is larger than that of the upper tunnel; the interaction influence of intersecting metro tunnel on the seismic response of any one-layer upper/under tunnel is related to the cross form of intersecting metro tunnels and the characteristics of the inputted near-field ground motion.
According to the explicit finite element method of ABAQUS and 32 CPU parallel computing cluster platform of the research group,a three-dimensional refined finite element model for cross tunnels is established and used to research the 3D nonlinear seismic response of cross tunnels under near-field strong ground motion and compare the results with that of one-layer upper/lower tunnels. The results show that:compared with a single deep/shallow-buried tunnels,for any one-layer upper/under tunnel of intersecting metro tunnels,the relative horizontal displacement difference of the tunnel top and bottom is magnified; and the seismic stress of intersecting tunnels is reduced; the seismic stress on the left side of tunnels is larger than that of the right side; and the seismic stress of tunnel spandrel and hance is significantly greater than that of other parts; and the tunnel spandrel is the most dangerous part of the tunnel structure. The acceleration response of top and bottom at the under tunnel of intersecting metro tunnels is larger than that of the upper tunnel; the interaction influence of intersecting metro tunnel on the seismic response of any one-layer upper/under tunnel is related to the cross form of intersecting metro tunnels and the characteristics of the inputted near-field ground motion.
引文
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[2]陈磊,陈国兴.近场和远场地震动作用下双层竖向重叠地铁隧道的地震反应比较[J].中国铁道科学,2010,31(1):79-85.CHEN Lei,CHEN Guo-xing.Comparative study on the characteristics of seismic responses of two-layer vertical overlapping metro tunnels under near-field and far-field ground motions[J].China Railway Science,2010,31(1):79-85.
[3]HORIBE Y,YAGI H,OJAYASU S,et al.Connection between two tunnels under a busy crossing in a big city[C]//Proc.Congress.Cairo:Balkema A A,1994.
[4]靳晓光,张宪鑫,李勇,等.大型地下立交动态施工过程3D有限元分析[J].地下空间与工程学报,2009,5(2):215-219.JIN Xiao-guang,ZHANG Xian-xin,LI Yong,et al.3D finite element research on dynamic construction mechanics for a large-sized underground interchange[J].Chinese Journal of Underground Space and Eng-ineering,2009,5(2):215-219.
[5]姜忻良,谭丁,姜南.交叉隧道地震反应三维有限元和无限元分析[J].天津大学学报,2004,30(4):32-36.JIANG Xin-liang,TAN Ding,JIANG Nan.3D finite and infinite element analysis for seismic response of intersecting tunnel[J].Journal of Tianjin University,2004,30(4):32-36.
[6]杨林德,王国波,郑永来,等.地铁车站接头结构振动台模型试验及地震响应的三维数值模拟[J].岩土工程学报,2007,29(12):1892-1898.YANG Lin-de,WANG Guo-bo,ZHENG Yong-lai,et al.Shaking table tests on subway station joint structure and3D numerical simulation of seismic response[J].Chinese Journal of Geotechnical Engineering,2007,29(12):1892-1898.
[7]MAYORAL J M,ROMO M P,MARTINEZ S.Advanced3-D seismic soil-structure interaction analysis of a cellular-raft foundation in soft clay[C]//Geotechnical Earthquake Engineering and Soil Dynamics IV Congress2008.Sacramento:[s.n].,2008.
[8]BRAY J D,RODRIGUEZ-MAREK A.Characterization of forward-directivity ground motions in the near-fault region[J].Soil Dynamics and Earthquake Engineering,2004,24(5):815-828.
[9]AKKAR S,YAZGAN U,GULKAN P.Drift estimates in frame building subjected t o near-fault motions[J].Journal of Structural Engineering,ASCE,2005,131(7):1014-1024.
[10]CHEN Guo-xing,CHEN Lei,JING Li-ping,et al.Comparison of explicit and implicit finite element methods with parallel computing for seismic response analysis of subway underground structure[C]//Inter-national Symposium on Geomechanics and Geotechnics.Shanghai:CRC Press,2010.
[11]陈国兴.岩土地震工程学[M].北京:科学出版社,2007.
[12]LEE JEEHO,GREGORY L FENVES.Plastic-damage model for cyclic loading of concrete structures[J].Journal of Engineering Mechanics,1998,124(4):892-900.
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