棚洞与隧道洞口段的地震反应分析
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摘要
应用有限元法并采用等效黏-弹性人工边界,对棚洞和隧道洞口段的施工过程进行了模拟,确定了隧道施工完成后的静应力场,并进行了三维地震反应分析。计算中分别考虑了不同围岩级别以及棚洞与隧道洞口的不同联接形式对地震反应的影响。计算结果表明:棚洞的纵梁距离洞口越远,其内力越小,在棚洞与隧道洞口的联接处附近,棚洞梁将产生较大的应力;围岩的力学指标越高,棚洞结构的内力越小;当棚洞结构横向一侧与围岩刚性联接时,隧道洞口与棚洞纵向采用刚性联接比采用柔性联接更有利。
Based on FEM method,3-D seismic responses of the connection part of a tunnel and its shed-tunnel were performed by equivalent viscous-spring artificial boundary.The influence to the seismic response from different rock mass and Connection type of shed-tunnel and the tunnel entrance were respectively taken into account.The results show that internal force of shed-tunnel was reduced along with the distance of shed-tunnel and tunnel entrance increasing;and the higher Physical mechanics property index of the rock is,the smaller structure internal force of shed-tunnel is;in some cases,rigid joint is better than hinge joint to be applied in the joint part of shed-tunnel and hidden hole.
Based on FEM method,3-D seismic responses of the connection part of a tunnel and its shed-tunnel were performed by equivalent viscous-spring artificial boundary.The influence to the seismic response from different rock mass and Connection type of shed-tunnel and the tunnel entrance were respectively taken into account.The results show that internal force of shed-tunnel was reduced along with the distance of shed-tunnel and tunnel entrance increasing;and the higher Physical mechanics property index of the rock is,the smaller structure internal force of shed-tunnel is;in some cases,rigid joint is better than hinge joint to be applied in the joint part of shed-tunnel and hidden hole.
引文
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[2]Mackie K R,Stojadinovich B.Fourway:Graphical tool for perform-ance-based earthquake engineering[J].J.Struct.Eng.,ASCE,2006,132(8):1274-1283.
[3]Mitra S.Investigating the impact of sun glare on transportation safe-ty[C/CD-ROM]//Proc.,87th Annual Meeting of TransportationResearch Board.Washington,D.C.:Transportation ResearchBoard,2008.
[4]Suwansawat S.Superposition technique for mapping surface settle-ment troughs over twin tunnels[C]//Proc.,Int.Symp.on Under-ground Excavation and Tunnelling.Bangkok,Thailand:ITA,2006:353-362.
[5]蒋树屏,刘元雪,黄伦海.环保型傍山隧道结构研究[J].中国公路学报,2006,19(1):80-83.JIANG Shu-ping,LIU Yuan-xue,HUANG Lun-hai.Research onenvironmental friendly structure of tunnel adjacent to mountain[J].China Journal of Highway and Transport,2006,19(1):80-83.
[6]Suwansawat S,Einstein H H.Artificial neural networks for predic-ting the maximum surface settlement caused by EPB shield tunne-ling[J].Tunn.Undergr.Space Technol.,2006,21(2):133-150.
[7]Klar A,Osman A S,Bolton M.2D and3D upper bound solutionsfor tunnel excavation using elastic flow fields[J].Int.J.Numer.Anal.Meth.Geomech.,2007,31:1367-1374.
[8]Meguid M A,Saada O,Nunes M A,et al.Physical modeling of tun-nels in soft ground:A review[J].Tunnelling and UndergroundSpace Technology,2008,23:185-198.
[9]Hwang J H,Lu C C.Seismic capacity assessment of old Sanyi rail-way tunnels[J].Tunnelling and Underground Space Technology,2007,22(4):433-449.
[10]谷音,刘晶波,杜义欣.三维一致黏弹性人工边界及等效黏弹性边界单元[J].工程力学,2007,24(12):31-37.GU Yin,LIU Jing-bo,DU Yi-xin.3-D consistent viscous-spring ar-tificial boundary and viscous-spring boundary element[J].Engi-neering Mechanics,2007,24(12):31-37.
[11]郭军,王明年,田尚志.高烈度地震区公路隧道明洞抗震计算分析[J].岩土工程学报,2007,29(11):1734-1736.GUO Jun,WANG Ming-nian,TIAN Shang-zhi.Aseismatic analysison open tunnels of freeway in seismic region with strong motion[J].Chinese Journal of Geotechnical Engineering,2007,29(11):1734-1736.
[12]陈赤坤.地震区遮拦危岩落石的框架棚洞设计[J].科学技术通讯,2003,11(2):13-17.CHEN Chi-kun.Design of frame shed-tunnel to block crag androckfall in seismic region[J].Technological Communication,2003,11(2):13-17.
[13]刘晶波,李彬.三维黏弹性静-动力统一人工边界[J].中国科学:E辑,2005,35(9):966-980.LIU Jing-bo,LI Bin.Three dimensional viscous-spring static-dy-namic artificial boundaries[J].Science in China,2005,35(9):966-980.
[14]JTG D70—2004公路隧道设计规范[S].北京:人民交通出版社,2004.
[15]潘昌实.隧道力学数值方法[M].北京:中国铁道出版社,1995.
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