地铁双层交叉隧道非线性地震响应分析
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摘要
以北京某地铁双洞盾构隧道近距离下穿既有矩形矿山法隧道为例,建立不同交叉角度的地铁双层交叉隧道三维数值模型,采用日本阪神波及北京人工波作为向基岩输入的地震波,研究其在水平强地震动作用下的地震响应特性,并与单层矩形/圆形隧道的地震响应特性进行比较。结果表明:双层近距离交叉隧道相互作用效应对上、下层隧道相对水平位移峰值和振动加速度均具有放大作用,且均随着交叉角度的增大而减小,对上层矩形隧道的地震应力有增大作用,对下层圆形隧道的地震应力有减小作用,且与交叉形式和基岩输入的地震波特性密切相关;上层矩形隧道顶、底板与侧墙的连接部位、中隔墙(中柱)的顶部和底部,以及下层圆形隧道的拱肩和拱腰处是结构的薄弱部位;矩形隧道和圆形隧道的地震变形模式分别近似于正弦曲线的单调递增段和反S形;场地土层的变形以剪切变形为主;土与结构的接触面是地震发生时的薄弱环节。
Taking a certain twin-tube shield tunnel of Beijing metro closely under-crossing the existing rectangular mined tunnel as an example,the 3Dnumerical model for double-decked intersecting metro tunnel with different cross angles was established.Kobe wave and Beijing artificial wave was taken as the input seismic wave of bedrock.The seismic response characteristics under strong horizontal ground motion were studied and the results were compared with those of single-layer rectangular/circular tunnels.The results showed that the interaction effect of double-decked closely-intersecting tunnels amplified the peak values of the relative horizontal displacement and vibration acceleration of the top layer and bottom layer tunnels,and it decreased with the increase of cross angle.The seismic stress of the rectangular tunnel on the top layer was increased while that of the circular tunnel on the bottom layer was reduced.The interaction effect of intersecting metro tunnels was closely related to the cross form and the characteristics of the input seismic wave of bedrock.The weak parts of the tunnel structure were the roof of rectangular tunnel on the top layer,the connection part of floor and side wall,the top and bottom of the pillar(central column)as well as the spandrel and the hance of the circular tunnel on the bottom layer.The seismic deformation patterns of rectangular tunnel and circular tunnel were respectively similar to the monotone increasing of sine curve and reversed S-shaped curve.The site soil deformation was mainly shear deformation.The contact surface between soil and structure was weak when the earthquake would happen.
引文
[1]郭春安.北京城市轨道交通线网调整规划[J].城市交通,2004,2(1):33-38.(GUO Chunan.Beijing Urban Rail Transit Line Network Adjustment Plan[J].Urban Transportation,2004,2(1):33-38.in Chinese)
    [2]陈磊,陈国兴,李丽梅.近场和远场地震动作用下双层竖向重叠地铁隧道地震反应特性[J].中国铁道科学,2010,31(1):79-86.(CHEN Lei,CHEN Guoxing,LI Limei.Seismic Response Characteristics of the Double-Layer Vertical Overlapping Metro Tunnels under Near-Field and Far-Field Ground Motions[J].China Railway Science,2010,31(1):79-86.in Chinese)
    [3]胡建平,刘亚莲.软土地基中立体交叉隧道地震动力响应分析[J].四川建筑科学研究,2013,39(2):240-243.(HU Jianping,LIU Yalian.Seismic Dynamic Response Analysis of Three-Dimensional Crossing Tunnel on Soft Foundation[J].Sichuan Building Science,2013,39(2):240-243.in Chinese)
    [4]胡建平,刘亚莲.复杂环境条件下交叉隧道地震动力响应分析[J].工程抗震与加固改造,2013,35(3):37-41.(HU Jianping,LIU Yalian.Seismic Dynamic Response Analysis of Crossing Tunnel in Complex Environment[J].Earthquake Resistant Engineering and Retrofitting,2013,35(3):37-41.in Chinese)
    [5]赵伯明,苏彦.盾构隧道的纵向地震响应[J].中国铁道科学,2009,30(5):59-64.(ZHAO Boming,SU Yan.The Longitudinal Seismic Response of Shield Tunnel[J].China Railway Science,2009,30(5):59-64.in Chinese)
    [6]何川,苏宗贤,曾东洋.地铁盾构隧道重叠下穿施工对上方已建隧道的影响[J].土木工程学报,2008,41(3):91-98.(HE Chuan,SU Zongxian,ZENG Dongyang.Influence of Metro Shield Tunneling on Existing Tunnel Directly Above[J].China Civil Engineering Journal,2008,41(3):91-98.in Chinese)
    [7]杨广武,关龙,刘军,等.盾构法隧道下穿既有结构三维数值模拟分析[J].中国铁道科学,2009,30(6):54-60.(YANG Gungwu,GUAN Long,LIU Jun,et al.Three-Dimensional Numerical Simulation Analysis of the ShieldDriven Tunnel Crossing under the Existing Structure[J].China Railway Science,2009,30(6):54-60.in Chinese)
    [8]孙钧,刘洪洲.交叠隧道盾构法施工土体变形的三维数值模拟[J].同济大学学报,2002,30(4):379-385.(SUN Jun,LIU Hongzhou.3-D Numerical Simulation of Ground Surface Settlement under Overlapped Shield Tunneling[J].Journal of Tongji University,2002,30(4):379-385.in Chinese)
    [9]许有俊,陶连金,文中坤,等.新建地铁隧道上穿既有隧道引起的结构隆起变形[J].中国铁道科学,2014,35(6):48-54.(XU Youjun,TAO Lianjin,WEN Zhongkun,et al.Upheaval Deformation Induced by Newly-Built Metro Tunnel Upcrossing Existing Tunnel[J].China Railway Science,2014,35(6):48-54.in Chinese)
    [10]陈国兴.岩土地震工程学[M].北京:科学出版社,2007.
    [11]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.
    [12]MAYORAL J M,ROMO M P,MARTINEZ S.Advanced 3-D Seismic Soil-Structure Interaction Analysis of a Cellular-Raft Foundation in Soft Clay[C]//Geotechnical Earthquake Engineering and Soil Dynamics IV Congress 2008.Sacramento:[s.n.],2008.
    [13]庄海洋.土—地下结构非线性动力相互作用及其大型振动台试验研究[D].南京:南京工业大学,2006.(ZHUANG Haiyang.Study on Nonlinear Dynamic Soil-Underground Structure Interaction and Its Large-Size Shaking Table Test[D].Nanjing:Nanjing University of Technology,2006,in Chinese)

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