两个水平密贴地下结构的地震响应分析
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摘要
为了研究相互邻近的地下结构的地震响应特征,以某新建地铁车站结构和上部密贴的既有公路隧道结构为对象,利用有限元分析软件MIDAS-GTS,对水平密贴的两个地下结构的地震响应进行数值模拟,分析公路隧道结构在有、无地铁车站结构时的地震响应,探讨结构接触面性质对水平密贴结构的地震响应的影响。计算结果表明:1)在设定条件下,地铁车站结构对公路隧道结构水平位移的影响幅度小于5%,但公路隧道顶板与底板的相对水平位移峰值增大了20%,水平加速度峰值增大幅度大于5%,隔墙动应力峰值增大11%,底板结构应力峰值增大150%;2)影响公路隧道结构动力响应的结构接触面性质主要是切向刚度,切向刚度增大,接触面范围内的公路隧道底板下侧的动应力减小,而接触面两侧的公路隧道底板的动应力却有明显的增大。
The seismic response of a newly-built Metro station and an upper highway tunnel is numerically simulated by means of finite element software MIDAS-GTS,the seismic response of the highway tunnel with and without Metro station is analyzed,and the influence on the seismic response of the adjacent underground structure imposed by the characteristics of the contact face is discussed.The calculation results show that: 1) Under given condition,the influence on the horizontal displacement of the highway tunnel induced by Metro station is less than 5%,the relative horizontal displacement of the roof slab and bottom slab increases by 20%,the peak horizontal acceleration increases by more than 5%,the peak dynamic stress of the separation wall increases by more than 11%,and the peak stress of the bottom slab increases by 150%.2) The tangential rigidity is the main factor that affects the dynamical response of highway tunnel structure.When the tangential rigidity increases,the stress under the bottom slab within the contact face scope decreases,while the stress of the bottom slab of the highway tunnel on both sides of contact face increases.
The seismic response of a newly-built Metro station and an upper highway tunnel is numerically simulated by means of finite element software MIDAS-GTS,the seismic response of the highway tunnel with and without Metro station is analyzed,and the influence on the seismic response of the adjacent underground structure imposed by the characteristics of the contact face is discussed.The calculation results show that: 1) Under given condition,the influence on the horizontal displacement of the highway tunnel induced by Metro station is less than 5%,the relative horizontal displacement of the roof slab and bottom slab increases by 20%,the peak horizontal acceleration increases by more than 5%,the peak dynamic stress of the separation wall increases by more than 11%,and the peak stress of the bottom slab increases by 150%.2) The tangential rigidity is the main factor that affects the dynamical response of highway tunnel structure.When the tangential rigidity increases,the stress under the bottom slab within the contact face scope decreases,while the stress of the bottom slab of the highway tunnel on both sides of contact face increases.
引文
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[18]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009.
[2]张凯,贺婷.盾构近距离下穿地铁运营隧道施工技术[J].隧道建设,2008,28(4):483-488.(ZHANG Kai,HETing.Construction technology for shield-bored tunnel cross-ing underneath adjacent operation Metro tunnel[J].TunnelConstruction,2008,28(4):483-488.(in Chinese))
[3]李围,何川.盾构隧道近接下穿地下大型结构施工影响研究[J].岩土工程学报,2006,28(10):1277-1282.(LIWei,HE Chuan.Study on construction influence of shieldtunnels traversing adjacently under underground large-scalestructure[J].Chinese Journal of Geotechnical Engineering,2006,28(10):1277-1282.(in Chinese))
[4]中华人民共和国国家标准.GB50111—2006铁路工程抗震设计规范[S].北京:中国计划出版社,2009.
[5]中华人民共和国国家标准.GB50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[6]Pao Y H,Mow C C.Diffraction of elastic waves and dynamicstress concentrations[M].New York:Crane,Russak&Company Inc.,1973.
[7]Lee V W,Trifunac M D.Response of tunnels to incidentSH-waves[J].Journal of Engineering Mechanics,ASCE,1979,105:643-659.
[8]Balendra T,Thambiratnam D P,Koh C G,et al.Dynamicresponse of twin circular tunnels due to incident SH-waves[J].Earthquake Engineering and Structural Dynamics,1984,12:181-201.
[9]梁建文,张浩,Vincent W Lee.地下双洞室在SV波入射下动力响应问题解析解[J].振动工程学报,2004,17(2):16-24.(LIANG Jianwen,ZHANG Hao,Vincent W Lee.An analytical solution for dynamic stress concentration of un-derground twin cavities due to incident SV waves[J].Journalof Vibration Engineering,2004,17(2):16-24.(in Chi-nese))
[10]庄海洋,陈国兴.双洞单轨地铁区间隧道非线性地震反应分析[J].地震工程与工程振动,2006,26(2):133-139.(ZHUANG Haiyang,Chen Guoxing.Analysis of non-linear earthquake response of Metro double-tunnels[J].Earthquake Engineering and Engineering Vibration,2006,26(2):133-139.(in Chinese))
[11]陈磊,陈国兴.近断层强地震动下双层竖向重叠地铁隧道的地震反应[J].防灾减灾工程学报,2008,28(4):5-14.(CHEN Lei,CHEN Guoxing.Seismic response of verticallydouble-layered metro tunnels under near-fault strong groundmotion[J].Journal of Disaster Prevention and Mitigation Engi-neering,2008,28(4):5-14.(in Chinese))
[12]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):81-88.(CHEN Lei,CHEN Guoxing,LILimei.Seismic response characteristics of the double-layervertical overlapping metro tunnels under near-field and far-field ground motions[J].China Railway Science,2010,31(1):81-88.(in Chinese))
[13]陈磊,陈国兴,龙慧.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[J].岩土力学,2010,31(12):280-285,292.(CHEN Lei,CHEN Guoxing,LONG Hui.3D refined nonlinear finite element analysis ofintersecting Metro tunnels under near-field ground motion[J].Rock and Soil Mechanics,2010,31(12):280-285,292.(in Chinese))
[14]Lysmer J,Kulemeyer R L.Finite dynamic model for infi-nite media[J].Journal of the Engineering Mechanics,ASCE,1969,95(4):859-877.
[15]Clayton R,Engquist B.Absorbing boundary conditions foracoustic and elastic wave equations[J].Bulletin of theSeismological Society of America,1977,67(6):1529-1540.
[16]廖振鹏,黄孔亮,杨柏坡,等.暂态波透射边界[J].中国科学:A辑数学物理学天文学技术科学,1984(6):76-84.
[17]Deeks A J,Randolph M F.Axisymmetric time-domaintransmitting boundaries[J].Journal of the Engineering Me-chanics,1994(1):25-42.
[18]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009.
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