“群洞效应”对紧邻交叠盾构隧道及场地土地震响应影响的初步分析
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摘要
随着地下空间开发利用的深度和广度的进一步发展,近距离、复杂、相互穿越的大型地下空间工程必将大量涌现,各地下工程必将影响到其他相邻地下工程的抗震性能。以武汉地铁二号线和四号线工程在洪(洪山广场站)中(中南路站)区间的紧邻四孔交叠盾构隧道为依托,建立不同隧道数目的计算模型,分析了"群洞效应"对近距离多孔盾构隧道地震响应以及对场地土动力特性的影响规律。计算分析结果表明:①下卧隧道能在一定程度上阻断地震波的传播,起到减震的作用;②上层隧道的存在降低了周围土层对邻近隧道的约束作用,即降低了邻近隧道的抗震性能;③"群洞效应"对场地土基本周期以及地表加速度放大效应的影响均不显著;④浅层上覆土层对隧道抗震性能及场地土加速度放大效应影响显著。
More and more adjacent,complicated underground structures will run across each other with the further exploitation and utilization of underground space,and hence,the seismic ability of underground structures will be influenced by the adjacent underground structures.Focused on the subway tunnels between Hongshang Square Station and Zhongnan Road Station on Wuhan rail transit lines No.2 and 4,the relevant models for different numbers of tunnels and different tunnel net distances are established,and the seismic responses of tunnels and site soils influenced by group cavities effect are analyzed.The results show that: 1) the lower tunnel can cut off the transmission of seismic waves,and therefore,it can play the function of shock absorption;2) the existence of the upper tunnel weakens the constraining effect of surrounding soils on the adjacent tunnel,and as a result,the seismic ability of the adjacent tunnel will be reduced;3) the group cavities have little effect on the fundamental period of soils and acceleration magnification effect;and 4) the shallow overlying soil has a significant effect on the seismic ability of tunnels and acceleration magnification effect of site soils.
More and more adjacent,complicated underground structures will run across each other with the further exploitation and utilization of underground space,and hence,the seismic ability of underground structures will be influenced by the adjacent underground structures.Focused on the subway tunnels between Hongshang Square Station and Zhongnan Road Station on Wuhan rail transit lines No.2 and 4,the relevant models for different numbers of tunnels and different tunnel net distances are established,and the seismic responses of tunnels and site soils influenced by group cavities effect are analyzed.The results show that: 1) the lower tunnel can cut off the transmission of seismic waves,and therefore,it can play the function of shock absorption;2) the existence of the upper tunnel weakens the constraining effect of surrounding soils on the adjacent tunnel,and as a result,the seismic ability of the adjacent tunnel will be reduced;3) the group cavities have little effect on the fundamental period of soils and acceleration magnification effect;and 4) the shallow overlying soil has a significant effect on the seismic ability of tunnels and acceleration magnification effect of site soils.
引文
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[16]Itasca Consulting Group.Fast Lagrangian analysis ofcontinua in 3 dimensions[R].Minneapolis:Itasca ConsultingGroup,Inc,2002.
[2]STAMOS A A,BESKOS D E.3-D seismic response analysisof long lined tunnels in half-space[J].Soil Dynamics andEarthquake Engineering,1996,15(2):111-118.
[3]HUO H,BOBET A,FERNáNDEZ G,et al.Load transfermechanisms between underground structure and surroundingground:Evaluation of the failure of the Daikai station[J].Journal of Geotechnical and Geoenvironmental Engineering,2005,131(12):1522-1533.
[4]梁建文,张浩,LEE V W.地下洞室群对地面运动的影响[J].土木工程学报,2005,39(2):106-114.(LIANGJian-wen,ZHANG Hao,LEE V W.Effect of undergroundgroup cavities on ground surface motion[J].China CivilEngineering Journal,2005,39(2):106-114.(in Chinese))
[5]梁建文,李帆,刘中宪.地铁隧道群对地震动的放大作用[J].地震工程与工程振动,2011,31(2):31-39.(LIANGJian-wen,LI Fan,LIU Zhong-xian.Amplification of groundmotion by metro tunnel group[J].Journal of EarthquakeEngineering and Engineering Vibration,2011,31(2):31-39.(in Chinese))
[6]梁建文,张浩,LEE V W.平面P波入射下地下洞室群动应力集中问题解析解[J].岩土工程学报,2004,26(6):815-819.(LIANG Jian-wen,ZHANG Hao,LEE V W.Ananalytical solution for dynamic stress concentration ofunderground cavities under incident plane P waves[J].Chinese Journal of Geotechnical Engineering,2004,26(6):815-819.(in Chinese))
[7]何伟,陈健云,于品清.地下结构开发对场地地表反应谱影响研究[J].地下空间与工程学报,2009,5(6):1098-1103.(HE Wei,CHEN Jian-yun,YU Pin-qing.A study oninfluence of underground structure on ground surfaceresponse spectrum[J].Chinese Journal of Underground Spaceand Engineering,2009,5(6):1098-1103.(in Chinese))
[8]陈方杰.邻近建筑对地铁结构地震反应的影响研究[D].北京:中国地震局地球物理研究所,2009.(CHEN Fang-jie.Influence of nearby ground building on seismic response ofsubway structure[D].Beijing:Insttute of Geophysics,ChinaEarthquake Administration,2009.(in Chinese))
[9]陈国兴,庄海洋,徐烨.软弱地基浅埋隧洞对场地设计地震动的影响[J].岩土工程学报,2004,26(6):739-744.(CHEN Guo-xing,ZHUANG Hai-yang,XU Ye.A study oninfluence of excavated shallow tunnel on design parametersof ground motion in the soft site[J].Chinese Journal ofGeotechnical Engineering,2004,26(6):739-744.(inChinese))
[10]徐炳伟.大型复杂结构-桩-土振动台模型试验研究[D].天津:天津大学,2009.(XU Bing-wei.Shaking table teststudying large-scale soil-pile-complex structure interaction[D].Tianjin:Tianjin University,2009.(in Chinese))
[11]SMERZINI C,AVILES J,PAOLUCCI R,et al.Effect ofunderground cavities on surface earthquake ground motionunder SH wave propagation[J].Earthquake Engineering andStructural Dynamics,2009,38(12):1441-1460.
[12]PAIS A,KAUSEL E.Effect of underground tunnel on seismicmotions in Mexico City[R].MIT Research Report R89-07,1989.
[13]王国波,陈梁,徐海清,等.紧邻多孔交叠隧道抗震性能研究[J].岩土力学,2012,33(8):2483-2490.(WANGGuo-bo,CHEN Liang,XU Hai-qing,et al.Study on seismiccapability of adjacent overlapping multi-tunnels[J].Rock andSoil Mechanics,2012,33(8):2483-2490.(in Chinese))
[14]孔戈.盾构隧道地震响应分析及抗减震措施研究[D].上海:同济大学,2007.(KONG Ge.Study on seismicresponses analysis and shock absorption measures of shieldtunnel[D].Shanghai:Tongji University,2007.(in Chinese))
[15]郑永来,杨林德,李文艺,等.地下结构抗震[M].上海:同济大学出版社,2005.(ZHENG Yong-lai,YANG Lin-de,LI Wen-yi,et al.Anti-seismic of underground structures[M].Shanghai:Tongji University Press,2005.(in Chinese))
[16]Itasca Consulting Group.Fast Lagrangian analysis ofcontinua in 3 dimensions[R].Minneapolis:Itasca ConsultingGroup,Inc,2002.
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