超小净距分岔式隧道施工方法数值模拟研究
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摘要
以在建的阳安二线直通线包湾村隧道工程为依托,针对分岔隧道工程中较为少见的反向扩挖法和传统中隔墙法进行三维数值模拟,从结构应力、位移和塑性区范围3方面,对大跨段、连拱段、小净距段及中墙进行对比研究。结果表明:2种工法均能保证隧道施工安全,而反向扩挖法更优;隧道分岔段为工程薄弱部位,且存在左右线施工相互影响和偏压问题,应引起重视并采取措施。通过随后的现场监测,证明数值模拟结果可以指导施工,表明反向扩挖法用于分岔隧道施工是可行的,值得推广。
Based on the under construction Baowancun Tunnel which is part of the second line of Yangan Railway,the relatively rare Reverse Expansion Method and the traditional Middle Partition Method in forked tunnels were evaluated through the three dimensional numerical method.The large span section,multi-arch section,small spacing section and middle wall in the two methods were analyzed from three aspects,including stresses,displacements and plastic zones.Results showed that both methods can meet the requirement of tunnel construction safety,but Reverse Expansion Method is relatively better.The forked section was the weak part of the project.When the left and the right small tunnels were concurrently constructed,there were the phenomenon of interaction and biasing.Therefore,attention should be paid and measures should be timely taken.Through the field monitoring,it was proved that the results of numerical simulation can guide the construction,which showed that Reverse Expansion Method was feasible for forked tunnels and he method should be introduced to other similar projects.
Based on the under construction Baowancun Tunnel which is part of the second line of Yangan Railway,the relatively rare Reverse Expansion Method and the traditional Middle Partition Method in forked tunnels were evaluated through the three dimensional numerical method.The large span section,multi-arch section,small spacing section and middle wall in the two methods were analyzed from three aspects,including stresses,displacements and plastic zones.Results showed that both methods can meet the requirement of tunnel construction safety,but Reverse Expansion Method is relatively better.The forked section was the weak part of the project.When the left and the right small tunnels were concurrently constructed,there were the phenomenon of interaction and biasing.Therefore,attention should be paid and measures should be timely taken.Through the field monitoring,it was proved that the results of numerical simulation can guide the construction,which showed that Reverse Expansion Method was feasible for forked tunnels and he method should be introduced to other similar projects.
引文
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[14]丁浩,郭军,蒋树屏,等.水下隧道大跨分岔结构设计与围岩稳定分析[J].公路交通技术,2012(2):81-87.DING Hao,GUO Jun,JIANG Shuping,et al.Analysis of rock wall stability and structure design of large-span branch section of underwater tunnel[J].Technology of Highway&Transport,2012(2):81-87.(in Chinese)
[15]王者超,李术才,陈卫忠.分岔隧道变形监测与施工对策研究[J].岩土力学,2007,28(4):785-789.WANG Zhechao,LI Shucai,CHEN Weizhong.Deformation monitoring of bifurcation tunnel and countermeasures of construction technologies[J].Rock&Soil Mechanics,2007,28(4):785-789.(in Chinese)
[2]胡剑兵,褚以惇,乔春江,等.分岔隧道施工三维数值仿真模拟研究[J].公路,2009(3):193-199.HU Jianbing,CHU Yidun,QIAO Chunjiang,et al.Astudy on 3D numerical simulation of branch tunnel construction[J].Highway,2009(3):193-199.(in Chinese)
[3]朱道建.喇叭口分岔隧道设计方法及其计算分析[J].地下空间与工程学报,2011,7(4):749-752,806.ZHU Daojian.Design method and analysis of forked tunnel[J].Chinese Journal of Underground Space&Engineering,2011,7(4):749-752,806.(in Chinese)
[4]孙玉国,白继承.高速公路中硬岩分岔式隧道施工技术[J].现代隧道技术,2005,42(3):65-69,75.SUN Yuguo,BAI Jicheng.Construction techniques of a branching-out highway tunnel in medium hard surrounding rocks[J].Modern Tunnelling Technology,2005,42(3):65-69,75.(in Chinese)
[5]荆永军,樊至,欧阳刚杰,等.长沙营盘路湘江隧道分岔大跨施工技术[J].隧道建设,2013,33(3):231-236.JING Yongjun,FAN Zhi,OUYANG Gangjie,et al.Construction technology for fork section of Yingpanlu xiangjiang river crossing tunnel in Changsha,China[J].Tunnel Construction,2013,33(3):231-236.(in Chinese)
[6]刘强,漆泰岳.大跨度分岔隧道施工优化与地表沉降控制[J].地下空间与工程学报,2010,6(5):1033-1038.LIU Qiang,QI Taiyue.Construction optimization of large-span bifurcation tunnel and control of ground subsidence[J].Chinese Journal of Underground Space&Engineering,2010,6(5):1033-1038.(in Chinese)
[7]李术才,王汉鹏,郑学芬.分岔隧道稳定性分析及施工优化研究[J].岩石力学与工程学报,2008,27(3):447-457.LI Shucai,WANG Hanpeng,ZHENG Xuefen.Forked tunnel stability analysis and its construction optimization research[J].Chinese Journal of Rock Mechanics&Engineering,2008,27(3):447-457.(in Chinese)
[8]林刚,何川.双连拱公路隧道支护结构体系试验研究[J].西南交通大学学报,2004,39(3):362-365.LIN Gang,HE Chuan.Experiments of support structure of twin-bore highway tunnels[J].Journal of Southwest Jiaotong University,2004,39(3):362-365.(in Chinese)
[9]张志强,何川.连拱隧道中隔墙设计与施工力学行为研究[J].岩石力学与工程学报,2006,25(8):1632-1638.ZHANG Zhiqiang,HE Chuan.Study on mechanical behaviours of designing and construction for center pillar of double-arched tunnel[J].Chinese Journal of Rock Mechanics&Engineering,2006,25(8):1632-1638.(in Chinese)
[10]乔春江,朱光仪.超小净距隧道的设计与研究[J].公路,2006(7):179-184.QIAO Chunjiang,ZHU Guangyi.Design and study on tunnel with ultra-small spacing[J].Highway,2006(7):179-184.(in Chinese)
[11]毕强,吴金刚.大跨分岔式隧道结构设计关键技术研究[J].隧道建设,2011,31(6):668-677.BI Qiang,WU Jingang.Study on key technologies for structural design of large-span forked tunnel[J].Tunnel Construction,2011,31(6):668-677.(in Chinese)
[12]蔚立元,李术才,郭小红,等.分岔隧道过渡段稳定性研究[J].中国公路学报,2011,24(1):89-95.YU Liyuan,LI Shucai,GUO Xiaohong,et al.Study of stability of transition segment for bifurcation tunnel[J].China Journal of Highway&Transport,2011,24(1):89-95.(in Chinese)
[13]吴波,刘维宁,高波,等.地铁分岔隧道施工性态的三维数值模拟与分析[J].岩石力学与工程学报,2004,23(18):3081-3086.WU Bo,LIU Weining,GAO Bo,et al.3Dsimulation and analysis on construction behavior of forked metro tunnel[J].Chinese Journal of Rock Mechanics&Engineering,2004,23(18):3081-3086.(in Chinese)
[14]丁浩,郭军,蒋树屏,等.水下隧道大跨分岔结构设计与围岩稳定分析[J].公路交通技术,2012(2):81-87.DING Hao,GUO Jun,JIANG Shuping,et al.Analysis of rock wall stability and structure design of large-span branch section of underwater tunnel[J].Technology of Highway&Transport,2012(2):81-87.(in Chinese)
[15]王者超,李术才,陈卫忠.分岔隧道变形监测与施工对策研究[J].岩土力学,2007,28(4):785-789.WANG Zhechao,LI Shucai,CHEN Weizhong.Deformation monitoring of bifurcation tunnel and countermeasures of construction technologies[J].Rock&Soil Mechanics,2007,28(4):785-789.(in Chinese)