盾构下穿铁路路基钢轨变形及路基沉降分析
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摘要
为研究地铁盾构下穿铁路路基过程中钢轨变形与路基沉降的变化规律,分析路基深孔注浆的加固效果,基于天津地铁7号线盾构施工下穿某铁路工程,采用有限元软件Midas-NX对盾构下穿既有铁路过程进行动态模拟,分析了盾构穿越过程中有无深孔注浆时钢轨的水平与竖直变形,以及盾构施工完成后铁路路基竖向位移的分布规律.结果表明,钢轨的横向变形经历了两次先增后减的过程,并沿轨身呈对称分布;钢轨变形在盾构两次到达铁路正下方时达到极值,沿轨身沉降槽中心随施工步骤逐渐向工程中心移动;土层经深孔注浆加固后,钢轨的横、竖向位移以及路基沉降分别减小了85.1%、76.7%和74.1%,有利于保证铁路在地铁盾构过程中的安全性.
To study the changes of track deformation and subgrade settlement of the shield tunnels across the existing railway,and to analyze the reinforcement effect of deep hole grouting in subgrade,we carry out the dynamic simulation by using the finite element software Midas-NX based on the shield construction of Tianjin Metro Line 7. We analyze the horizontal and vertical deformations of the rail and the distribution of the vertical displacement of the railway subgrade after the completion of the shield construction. The results show that the transverse deformation of the rail undergoes two processes of enlargement first and then decreases with the construction progress,and forms a symmetrical distribution along the rail body; the rail deformation reaches the extreme value when the shield reaches the bottom of the railway for two times,and the center of the settlement trough along the rail gradually moves to the engineering center with the construction step. After reinforced by deep hole grouting,the lateral and vertical displacements of the rail and the settlement of the roadbed reduce by 85. 1%,76. 7% and 74. 1%,respectively,which is beneficial to ensure the safety of the railway in the subway shield process.
To study the changes of track deformation and subgrade settlement of the shield tunnels across the existing railway,and to analyze the reinforcement effect of deep hole grouting in subgrade,we carry out the dynamic simulation by using the finite element software Midas-NX based on the shield construction of Tianjin Metro Line 7. We analyze the horizontal and vertical deformations of the rail and the distribution of the vertical displacement of the railway subgrade after the completion of the shield construction. The results show that the transverse deformation of the rail undergoes two processes of enlargement first and then decreases with the construction progress,and forms a symmetrical distribution along the rail body; the rail deformation reaches the extreme value when the shield reaches the bottom of the railway for two times,and the center of the settlement trough along the rail gradually moves to the engineering center with the construction step. After reinforced by deep hole grouting,the lateral and vertical displacements of the rail and the settlement of the roadbed reduce by 85. 1%,76. 7% and 74. 1%,respectively,which is beneficial to ensure the safety of the railway in the subway shield process.
引文
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[2]汪珂,周慧,侯城,等.西安地铁盾构下穿古城墙沉降分析及加固效果[J].解放军理工大学学报自然科学版,2017,18(3):255-262.WANG Ke,ZHOU Hui,HOU Cheng,et al.Settlement analysis and reinforcement effect of ancient city wall due to underneath tunneling of Xi'an metro[J].Journal of PLAUniversity of Science and Technology Natural Science,2017,18(3):255-262.(in Chinese)
[3]赖金星,刘炽,胡昭,等.盾构隧道衬砌背后空洞对结构影响规律数值分析[J].现代隧道技术,2017,54(3):126-134.LAI Jinxing,LIU Chi,HU Zhao,et al.Numerical analysis of the influence of a cavity behind the shield lining on the tunnel structure[J].Modern Tunnelling Technology,2017,54(3):126-134.(in Chinese)
[4]赖金星,秦海洋,樊浩博,等.地铁盾构施工对大雁塔影响的数值分析[J].公路,2017,62(6):338-344.LAI Jinxing,QIN Haiyang,FAN Haobo,et al.Numerical analysis of the shield tunneling through the Great Wild Goose Pagoda[J].Highway,2017,62(6):338-344.(in Chinese)
[5]刘建国.盾构隧道下穿对土质路基无碴轨道的影响[J].华东交通大学学报,2006,23(4):5-8.LIU Jianguo.The research about the affect of the shield tunneling arcoss the ballastless-rail[J].Journal of East China Jiaotong University,2006,23(4):5-8.(in Chinese)
[6]张恒臻.地铁盾构隧道下穿既有铁路沉降分析与控制研究[D].北京:北京交通大学,2015.ZHANG Hengzhen.Settlement analysis and control research in metro shield tunnel tunneling underneath existing railways[J].Beijing:Bejing Jiaotong University,2015.(in Chinese)
[7]张云,殷宗泽,徐永福.盾构法隧道引起的地表变形分析[J].岩石力学与工程学报,2002,21(3):388-392.ZHANG Yun,YIN Zongze,XU Rongfu.Analysis on three-dimensional ground surface deformations due to shield tunnel[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(3):388-392.(in Chinese)
[8]郑余朝,仇文革,张俊儒.三管盾构隧道下穿铁路引起的地表位移及其控制技术[J].中国铁道科学,2007,28(5):65-70.ZHENG Yuchao,QIU Wenge,ZHANG Junru.Ground displacement caused by three pipes shield-driven tunnels through below railway on the ground and control technology[J].China Railway Science,28(5):65-70.(in Chinese)
[9]郑刚,张天奇,张扶正,等.不同埋深下盾构隧道开挖及补偿注浆对地表隆沉变化影响的室内试验[J].天津大学学报自然科学与工程技术版,2017,50(4):335-344.ZHENG Gang,ZHANG Tianqi,ZHANG Fuzheng,et al.Experiment on effect of shield tunneling and compensation grouting on surface settlement under different cover depths[J].Journal of Tianjin University Science and Technology,2017,50(4):335-344.(in Chinese)
[10]朱才辉,李宁.地铁施工诱发地表最大沉降量估算及规律分析[J].岩石力学与工程学报,2017,36(S1):3543-3560.ZHU Caihui,LI Ning.Estimation and regularity analysis of maximal surface settlement induced by subway construction[J].Chinese Journal of Rock Mechanics and Engineering,2017,36(S1):3543-3560.(in Chinese)
[11]游龙飞,王效文,龚彦峰,等.盾构下穿新建铁路站场地基预处理技术研究[J].铁道工程学报,2012,29(6):104-108.YOU Longfei,WANG Xiaowen,GONG Yanfeng,et al.Research on pretreatment approach of foundation for shield under-passing newly-built railway station[J].Journal of Railway Engineering Society,2012,29(6):104-108.(in Chinese)
[12]边金,陶连金,郭军.盾构隧道开挖引起的地表沉降规律[J].地下空间与工程学报,2005,1(2):247-254.BIAN Jin,TAO Lianjin,GUO Jun.The ground settlement monitoring of a shield Tunnel[J].Chinese Journal of Underground Space and Engineering,2005,1(2):247-254.(in Chinese)
[13]铁路轨道设计规范(TB 10082-2005)[S].北京:中国铁道出版社,2005.Code for design of railway track(TB 10082-2005)[S].Beijing:China Railway Culture Medie Co.,LTD,2005.(in Chinese)
[14]赖金星,刘厚全,汪珂,等.盾构近接立交桥基础安全影响三维数值分析[J].中国安全生产科学技术,2017,13(3):29-35.LAI Jinxing,LIU Houquan,WANG Ke,et al.Threedimensional numerical analysis on safety influence of shield tunneling construction on the foundation of adjacent overpass[J].Journal of Safety Science and Technology,2017,13(3):29-35.(in Chinese)