山岭隧道横截面抗震分析的近似方法
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摘要
根据山岭隧道的特点,考虑隧道围岩松散岩体的竖向惯性力和隧道结构本身承受的地层形变压力,基于反应变位法的基本原理,结合隧道当量半径的思想,得到隧道结构横截面抗震计算的近似方法。通过算例分析可知,在剪切波作用下,衬砌结构存在较大的拉应力,拱顶45范围内具有较大的弯矩和剪力,这是隧道抗震设计需要加强衬砌的重要因素之一。同时,该方法计算结果偏于保守,适用于强震作用下的情况。对于山岭隧道横截面抗震初步设计,可以应用该方法进行衬砌的强度验算。
According to the features of mountain tunnel,considered the vertical inertia of loosed surrounding rock and stratum deformation pressure on tunnel itself,based on the principle of displacement response method and the idea of equivalent radius,the approximate seismic analysis method of cross-section of mountain tunnel was obtained.The analysis of calculation example shows that(1) under the action of shear waves,great tensile stress existed in the lining,bending moment and shear force existed within the range of 45 degrees of vault,which is one of the important factors to strengthen the tunnel lining when considering the seismic design of tunnel;(2) the method could be applied to the tunnels under the action of strong earthquake due to its conservativeness;(3) in the preliminary design of earthquake-resistance of cross-section of mountain tunnel,the method could be applied to check the strength of lining.
According to the features of mountain tunnel,considered the vertical inertia of loosed surrounding rock and stratum deformation pressure on tunnel itself,based on the principle of displacement response method and the idea of equivalent radius,the approximate seismic analysis method of cross-section of mountain tunnel was obtained.The analysis of calculation example shows that(1) under the action of shear waves,great tensile stress existed in the lining,bending moment and shear force existed within the range of 45 degrees of vault,which is one of the important factors to strengthen the tunnel lining when considering the seismic design of tunnel;(2) the method could be applied to the tunnels under the action of strong earthquake due to its conservativeness;(3) in the preliminary design of earthquake-resistance of cross-section of mountain tunnel,the method could be applied to check the strength of lining.
引文
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[10]严松宏,潘昌实.沉管隧道在地震与静荷载共同作用下横向受力分析[J].兰州交通大学学报,2009,28(3):8-11.YAN Songhong,PAN Changshi.Transverse Internal ForceAnalysis of Immersed Tube Tunnel Subjected to Seismicand Dead Loads[J].Journal of Lanzhou Jiao tongUniversity,2009,28(3):8-11.
[11]GB50111—2006,铁路工程抗震设计规范[S].GB50111—2006,Code for Seismic Design of RailwayEngineering[S].
[12]谷拴成,高宗褀.土层隧道动力分析[J].西安科技大学学报,2002,22(4):404-406.GU Shuancheng,GAO Zongqi.Seismic Analysis ofTunnel in Soil[J].Journal of Xi'an University of Scienceand Technology,2002,22(4):404-406.
[2]谷拴成,朱彬,马德梅.地下结构抗震分析方法及其现状[J].西安科技大学学报,2005,25(2):143-146.GU Shuancheng,ZHU Bin,MA Demei.The Status quoand Methods of Antseismic Research of UndergroundStructure[J].Journal of Xi'an University of Science andTechnology,2005,25(2):143-146.
[3]李世辉.隧道支护设计新论(典型类比分析法应用与理论)[M].北京:科学出版社,1999.LI Shihui.New Theory of Tunnel Support Design(Applications and Theory of a Typical EngineeringAnalogy).Beijing:Science Press,1999.
[4]张栋梁,杨林德,谢永利,等.盾构隧道抗震设计计算的解析解[J].岩石力学与工程学报,2008,27(3):543-549.ZHANG Dongliang,YANG Linde,XIE Yongli,et al.Analytical Solution for Aseismic Design Calculation ofShield Tunnels[J].Chinese Journal of Rock Mechanicsand Engineering,2008,27(3):543-549.
[5]黄先锋.地下结构的抗震计算:反应位移法[J].铁道建筑,1999(6):3-6.HUANG Xianfeng.Seismic Calculations of UndergroundStructure:Response Displace[J].Railway Engineering,1999(6):3-6.
[6]HASHASH Y M A,HOOK J,SCHMIDT B,et al.Seismic Design and Analysis of Underground Structure[J].Tunneling and Underground Space Technology,2001,16(4):247-293.
[7]WANG J N.Seismic Design of Tunnels:a Simple State-of-the-art Approach[M].[s.l.]:Parsons Brinkerho Quakeand Douglas Inc,1993.
[8]阎盛海.地下结构抗震[M].大连:大连理工大学出版社,1989.YAN Shenghai.Underground Structural Seismic Resistance[M].Dalian:Dalian University of Technology Press,1989.
[9]严松宏,高波,潘昌实.隧道横向地震反应分析[J].工程力学,2000,2(增2):680-683.YAN Songhong,GAO Bo,PAN Changshi.TransverseSeismic Response Analysis of Tunnel[J].EngineeringMechanics,2000,2(S2):680-683.
[10]严松宏,潘昌实.沉管隧道在地震与静荷载共同作用下横向受力分析[J].兰州交通大学学报,2009,28(3):8-11.YAN Songhong,PAN Changshi.Transverse Internal ForceAnalysis of Immersed Tube Tunnel Subjected to Seismicand Dead Loads[J].Journal of Lanzhou Jiao tongUniversity,2009,28(3):8-11.
[11]GB50111—2006,铁路工程抗震设计规范[S].GB50111—2006,Code for Seismic Design of RailwayEngineering[S].
[12]谷拴成,高宗褀.土层隧道动力分析[J].西安科技大学学报,2002,22(4):404-406.GU Shuancheng,GAO Zongqi.Seismic Analysis ofTunnel in Soil[J].Journal of Xi'an University of Scienceand Technology,2002,22(4):404-406.
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