近距离垂直交叠盾构隧道的列车振动响应特性及损伤规律
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摘要
基于拟合的列车振动荷载,采用数值模拟方法研究当列车在上部隧道行驶时近距离垂直交叠盾构隧道的动力响应特性,以及在不同隧道净距时上部隧道的损伤分布规律。结果表明:在列车振动荷载作用下,列车距离分析断面越近,分析断面上隧道衬砌的振动加速度和振动最大主应力增量均越大;拱底的振动加速度最大,拱腰次之,拱顶最小;在交叠中心断面处,上部隧道的最大主应力增量远大于下部隧道;压致损伤和拉致损伤主要集中在上部隧道底部附近130°的范围内,且在交叠中心处达到最大。随着两个隧道净距的减小,上部隧道的压致和拉致损伤均增大;当两个隧道净距为6m时,仅交叠中心处上部隧道拱顶出现较小的压致和拉致损伤,当两个隧道净距为4和2m时,交叠中心处上部隧道的压致和拉致损伤增量较大,远离交叠处上部隧道仅出现较小的压致和拉致损伤,说明两个隧道近距离垂直交叠时,下部隧道对上部隧道的振动加速度、最大主应力增量和压致及拉致损伤具有放大效应。
Considering the fitting train vibration load,the numerical simulation method was used to study the dynamic response characteristics of the vertically overlapping shield tunnels in close distance space when the train was running in the upper tunnel and the damage distribution law of the upper tunnel at different clear distances of tunnels.Results show that,under the train vibration load,the closer the train distance to the analysis section is,the larger the vibration acceleration and the maximum principal stress increment of the tunnel lining on the analysis section will be.The vibration acceleration of the arch bottom is the largest,the hance is the second and the vault is the smallest.At the cross section of the overlapping center,the maximum principal stress increment of the upper tunnel is far greater than that of the lower tunnel.The compressive and tensile damage is mainly concentrated in the range of 130°near the bottom of upper tunnel,and reaches the maximum in the overlapping center.With the decrease of the clear distance between two tunnels,both the compressive and tensile damage of the upper tunnel increase.When the clear distance between two tunnels is 6 m,only the vault of upper tunnel at the overlapping center appears smaller compressive and tensile damage.When the clear distances between two tunnels are 4 and 2 m,the increment of the compressive and tensile damage in the upper tunnel at the overlapping center is larger,only smaller compressive and tensile damage occurs in the upper tunnel away from the overlap.It shows that when two tunnels overlap vertically in close distance space,the lower tunnel has an amplification effect on the vibration acceleration,the maximum principal stress increment,the compressive and tensile damage of upper tunnel.
Considering the fitting train vibration load,the numerical simulation method was used to study the dynamic response characteristics of the vertically overlapping shield tunnels in close distance space when the train was running in the upper tunnel and the damage distribution law of the upper tunnel at different clear distances of tunnels.Results show that,under the train vibration load,the closer the train distance to the analysis section is,the larger the vibration acceleration and the maximum principal stress increment of the tunnel lining on the analysis section will be.The vibration acceleration of the arch bottom is the largest,the hance is the second and the vault is the smallest.At the cross section of the overlapping center,the maximum principal stress increment of the upper tunnel is far greater than that of the lower tunnel.The compressive and tensile damage is mainly concentrated in the range of 130°near the bottom of upper tunnel,and reaches the maximum in the overlapping center.With the decrease of the clear distance between two tunnels,both the compressive and tensile damage of the upper tunnel increase.When the clear distance between two tunnels is 6 m,only the vault of upper tunnel at the overlapping center appears smaller compressive and tensile damage.When the clear distances between two tunnels are 4 and 2 m,the increment of the compressive and tensile damage in the upper tunnel at the overlapping center is larger,only smaller compressive and tensile damage occurs in the upper tunnel away from the overlap.It shows that when two tunnels overlap vertically in close distance space,the lower tunnel has an amplification effect on the vibration acceleration,the maximum principal stress increment,the compressive and tensile damage of upper tunnel.
引文
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[12]李杰,吴建营.混凝土弹塑性损伤本构模型研究Ⅰ:基本公式[J].土木工程学报,2005,38(9):14-20.(LI Jie,WU Jianying.Elastoplastic Damage Constitutive Model for Concrete Based on Damage Energy Release Rates,PartⅠ:Basic Formulations[J].China Civil Engineering Journal,2005,38(9):14-20.in Chinese)
[13]邹德高,徐斌,孔宪京.瑞利阻尼系数确定方法对高土石坝地震反应的影响研究[J].岩土力学,2011,32(3):797-803.(ZOU Degao,XU Bin,KONG Xianjing.Study of Influence of Different Methods for Calculating Rayleigh Damping Coefficient on High Earth-Rock Dam Seismic Response[J].Rock and Soil Mechanics,2011,32(3):797-803.in Chinese)
[14]潘昌实,PANDE G N.黄土隧道列车动荷载响应有限元初步数定分析研究[J].土木工程学报,1984(4):19-28.(PAN Changshi,PANDE G N.Preliminary Deterministic Finite Element Study on a Tunnel Driven in Loess Subjected to Train Loading[J].China Civil Engineering Journal,1984(4):19-28.in Chinese)
[2]陈卫军,张璞.列车动载作用下交叠隧道动力响应数值模拟[J].岩土力学,2002,23(6):770-774.(CHEN Weijun,ZHANG Pu.Numerical Simulation of Dynamic Response of Overlap Tunnels in Close Proximity Due to Train's Vibrating Load[J].Rock and Soil Mechanics,2002,23(6):770-774.in Chinese)
[3]林志鹏.列车荷载作用下重叠隧道结构动力响应分析[J].铁道科学与工程学报,2016,13(9):1789-1795.(LIN Zhipeng.Analysis on Dynamic Response of Overlapped Tunnel Structure under Vibration Load[J].Journal of Railway Science and Engineering,2016,13(9):1789-1795.in Chinese)
[4]高峰,关宝树,仇文革,等.列车荷载作用下地铁重叠隧道的响应分析[J].西南交通大学学报,2003,38(1):38-42.(GAO Feng,GUAN Baoshu,QIU Wenge,et al.Dynamic Responses of Overlapping Tunnels to Passing Trains[J].Journal of Southwest Jiaotong University,2003,38(1):38-42.in Chinese)
[5]HUANG Juan,YUAN Tieying,PENG Limin,et al.Model Test on Dynamic Characteristics of Invert and Foundation Soils of High-Speed Railway Tunnel[J].Earthquake Engineering and Engineering Vibration,2015,14(3):549-559.
[6]李亮,张丙强,杨小礼.高速列车振动荷载下大断面隧道结构动力响应分析[J].岩石力学与工程学报,2005,24(23):4259-4265.(LI Liang,ZHANG Bingqiang,YANG Xiaoli.Analysis of Dynamic Response of Large Cross-Section Tunnel under Vibrating Load Induced by High Speed Train[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(23):4259-4265.in Chinese)
[7]龚伦,郑余朝,仇文革.列车动载引起下穿隧道振动三维数值分析[J].现代隧道技术,2008,45(4):23-27,43.(GONG Lun,ZHENG Yuzhao,QIU Wenge.3DDynamic FE Analysis on the Behavior of Under-Crossing Tunnels Caused by Overhead Passing Trains[J].Modern Tunnelling Technology,2008,45(4):23-27,43.in Chinese)
[8]莫海鸿,邓飞皇,王军辉.营运期地铁盾构隧道动力响应分析[J].岩石力学与工程学报,2006,25(增2):3507-3512.(MO Haihong,DENG Feihuang,WANG Junhui.Analysis of Dynamic Response of Shield Tunnel during Metro Operation[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(Supplement 2):3507-3512.in Chinese)
[9]杨文波,徐朝阳,陈子全,等.列车振动荷载作用下管片接缝对盾构隧道衬砌结构与周围软土地层动力响应影响研究[J].岩石力学与工程学报,2017,36(8):1977-1988.(YANG Wenbo,XU Chaoyang,CHEN Ziquan,et al.Influence of Segment Joints on Dynamic Response of Shield Tunnel and Surrounding Soft Soil Due to Train Induced Vibration[J].Chinese Journal of Rock Mechanics and Engineering,2017,36(8):1977-1988.in Chinese)
[10]刘宇.软弱土地基盾构隧道高速列车动力响应分析[D].成都:西南交通大学,2011.(LIU Yu.The Dynamic Response Analysis of Shield Tunnel on Soft Foundation Exposed to High-Speed Train Vibration Excitation[D].Chengdu:Southwest Jiaotong University,2011.in Chinese)
[11]段景川.列车振动荷载下复杂空间与结构形态盾构隧道的动力特性[D].成都:西南交通大学,2013.(DUAN Jingchuan.Study on the Dynamic Characteristic of the Shield Tunnel with Complicated Space and Structure Morphology Train under Vibration Load[D].Chengdu:Southwest Jiaotong University,2013.in Chinese)
[12]李杰,吴建营.混凝土弹塑性损伤本构模型研究Ⅰ:基本公式[J].土木工程学报,2005,38(9):14-20.(LI Jie,WU Jianying.Elastoplastic Damage Constitutive Model for Concrete Based on Damage Energy Release Rates,PartⅠ:Basic Formulations[J].China Civil Engineering Journal,2005,38(9):14-20.in Chinese)
[13]邹德高,徐斌,孔宪京.瑞利阻尼系数确定方法对高土石坝地震反应的影响研究[J].岩土力学,2011,32(3):797-803.(ZOU Degao,XU Bin,KONG Xianjing.Study of Influence of Different Methods for Calculating Rayleigh Damping Coefficient on High Earth-Rock Dam Seismic Response[J].Rock and Soil Mechanics,2011,32(3):797-803.in Chinese)
[14]潘昌实,PANDE G N.黄土隧道列车动荷载响应有限元初步数定分析研究[J].土木工程学报,1984(4):19-28.(PAN Changshi,PANDE G N.Preliminary Deterministic Finite Element Study on a Tunnel Driven in Loess Subjected to Train Loading[J].China Civil Engineering Journal,1984(4):19-28.in Chinese)