偏压软弱围岩隧道开挖顺序比较研究
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摘要
针对偏压软弱围岩隧道预留核心土法不同开挖顺序造成围岩不同变形量的问题,结合洞头山工程实例,运用现场监控量测结合MIDAS数值模拟的方法,分析比较偏压软弱围岩隧道在不同开挖顺序下各阶段围岩位移变形量。研究表明:开挖顺序的改变能够有效减小隧道各部围岩变形量,且减小程度从大到小的岩体位置依次为浅埋拱腰处、浅埋拱脚处、深埋拱腰处、深埋拱脚与拱顶;拱浅埋侧最大主应力明显减小。因此对于偏压软弱围岩隧道先开挖深埋侧比先开挖浅埋侧更为安全合理。研究成果为隧道信息化施工提供依据,也为洞头山及具有类似地质地形情况的隧道施工提供借鉴与指导。
The present paper studies the deformation control of the soft surrounding rock tunnel caused by different excavation sequences of core-keeping ring cut method. The study is combined with engineering example of Dongtou Mountain tunnel. Firstly,with the tunnel model and various input parameters,the method of MIDAS numerical simulation is employed to analyze and compare the deformation of surrounding rock and maximum principal stress in different stages when the tunnel is under different excavation sequences. Finally the paper analyzes the combination of numerical simulation results and actual monitoring results. The results of the evaluation demonstrate that in the construction of Dongtou Mountain tunnel,the stability and deformation of surrounding rock are better guaranteed when the deeper side of the tunnel is first excavated rather than the shallower side. The reduction degrees of rock positions from large to small are shallow buried in the arch,shallow buried in the arch foot,deep buried in the waist,deep buried in the arch foot and vault in the descending order,respectively. The maximum principal stress decreases obviously in shallow buried side in the arch. Therefore,the better working condition is chosen and the effect of different excavation sequences on the deformation of surrounding rock of the tunnel is shown. The results provide references to the information-oriented construction of tunnel,and the guidance for design and constructionof Dongtou Mountain and other tunnels in similar geological condition.
The present paper studies the deformation control of the soft surrounding rock tunnel caused by different excavation sequences of core-keeping ring cut method. The study is combined with engineering example of Dongtou Mountain tunnel. Firstly,with the tunnel model and various input parameters,the method of MIDAS numerical simulation is employed to analyze and compare the deformation of surrounding rock and maximum principal stress in different stages when the tunnel is under different excavation sequences. Finally the paper analyzes the combination of numerical simulation results and actual monitoring results. The results of the evaluation demonstrate that in the construction of Dongtou Mountain tunnel,the stability and deformation of surrounding rock are better guaranteed when the deeper side of the tunnel is first excavated rather than the shallower side. The reduction degrees of rock positions from large to small are shallow buried in the arch,shallow buried in the arch foot,deep buried in the waist,deep buried in the arch foot and vault in the descending order,respectively. The maximum principal stress decreases obviously in shallow buried side in the arch. Therefore,the better working condition is chosen and the effect of different excavation sequences on the deformation of surrounding rock of the tunnel is shown. The results provide references to the information-oriented construction of tunnel,and the guidance for design and constructionof Dongtou Mountain and other tunnels in similar geological condition.
引文
Da X W,Shao Z S,Gao H P,et al.2016.Deformation mechanism of slope covered with clinosol at tunnel entrance and associated excavation technology in north Hubei province[J].Journal of Engineering Geology,24(3):465-476.
Fang Q,Song H R,Zhang D L.2015.Complex variable analysis for stress distribution of an underwater tunnel in an elastic half plane[J].International Journal for Numerical&Analytical Methods in Geomechanics,39(16):1821-1835.
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Gao P K,Xu L S,Wu H B.2013.Numerical analysis of construction behavior of a shallow and unsymmetrical loading portal in tunnel with weak rockmass[J].Highway,17(3):205-211.
Gao P K,Xie Y L,Wu H B.2012.Numerical analysis of a shallowburied portal in expressway tunnel with weak rockmass[J].Applied Mechanics&Materials,259:1369-1372.
Li P F,Zhao Y,Liu J Y.2014.Deformation characteristics and control method of tunnel with weak surrounding rock[J].China Railway Science,35(5):55-61.
Li Y,Emeriault F,Kastner R,et al.2009.Stability analysis of large slurry shield-driven tunnel in soft clay[J].Tunnelling&Underground Space Technology,24(4):472-481.
Li Z.2013.Midas/GTS in geotechnical engineering[M].Beijing:China Architecture&Building Press:107-124.
Liu X J,Zhang Y X.2011.Analysis of reasonable excavation sequence and stress characteristics of portal section of shallow tunnel with unsymmetrical loadings[J].Chinese Journal of Rock Mechanics and Engineering,30(S1):3066-3073.
Liu Y X,Jiang S P,Zhao S Y.2005.Optimizing analysis for construction schemes of shallow multi-arch loess tunnel[J].Chinese Journal of Underground Space and Engineering,1(6):944-947.
Shi X,Zhang J S,Liu B C.2015.A study on the construction sequences of a large-section shallow-buried unsymmetrical loading tunnel by the CRD method[J].Modern Tunnelling Technology,52(3):193-199.
Su P S,Xu Q W,Chen G Z,et al.2015.Study on the numerical simulation and field monitoring of soft rock tunnel entrance constructed by CRD method in red layer[J].Chinese Journal of Underground Space and Engineering,11(S2):785-791.
Sun Y,Chen J P,Yu L,et al.2013.Analysis of the large deformation mechanism of a shallow-buried unsymmetrical loading tunnel in soft rock and construction controls[J].Modern Tunnelling Technology,50(5):169-174.
Wang J,Li S C,Shi B,et al.2013.Trifarious FBG sensor strain transfer characteristics and its application to tunnel excavation model test[J].Journal of Engineering Geology,21(2):182-189.
Wang W,Zou J H,Pan W S,et al.2016.Study on influence to stability of surrounding rock by different construction sequence for bias tunnel with small interval and steep slope[J].Journal of Safety Science and Technology,12(8):28-33.
Xu S C,Liu T Y,Jin C Y.2013.Study on excavation procedure of Dawangou shallow tunnel under unsymmetrical pressure[J].Applied Mechanics&Materials,353-356,1539-1542.
Yang X L,Sui Z R.2007.Numerical simulation of construction sequence for shallow embedded bias tunnels with small clear distance[J].Journal of Central South University(Science and Technology),38(4):764-770.
Zhou Y H,Zhao Y M,Cheng C G.2002.Optimum analysis on the construction process for joint arch tunnels in partial pressure[J].Chinese Journal of Rock Mechanics and Engineering,21(5):679-683.
达晓伟,邵珠山,高怀鹏,等.2016.鄂北地区隧道洞口坡积土边、仰坡变形机制与进洞技术研究[J].工程地质学报,24(3):465-476.
丰明海,何振宁.2014.铁路隧道施工中围岩变形失稳工程地质问题[J].工程地质学报,22(4):677-683.
李鹏飞,赵勇,刘建友.2014.隧道软弱围岩变形特征与控制方法[J].中国铁道科学,35(5):55-61.
李治.2013.Midas/GTS在岩土工程中应用[M].北京:中国建筑工业出版社:107-124.
刘小军,张永兴.2011.浅埋偏压隧道洞口段合理开挖工序及受力特征分析[J].岩石力学与工程学报,30(S1):3066-3073.
刘元雪,蒋树屏,赵尚毅.2005.浅埋黄土连拱隧道施工方案优化研究[J].地下空间与工程学报,1(6):944-947.
石熊,张家生,刘宝琛.2015.大断面浅埋偏压隧道CRD法施工工序研究[J].现代隧道技术,52(3):193-199.
苏培森,徐前卫,陈国中,等.2015.“红层”软岩隧道进口段CRD法数值模拟及现场实测研究[J].地下空间与工程学报,11(S2):785-791.
孙洋,陈建平,余莉,等.2013.浅埋偏压隧道软岩大变形机理及施工控制分析[J].现代隧道技术,50(5):169-174.
王静,李术才,施斌,等.2013.三向FBG应变传感器及在隧道开挖模型试验中的应用研究[J].工程地质学报,21(2):182-189.
王薇,邹江海,潘文硕,等.2016.不同施工顺序对陡坡偏压小净距隧道围岩稳定性的影响研究[J].中国安全生产科学技术,12(8):28-33.
杨小礼,眭志荣.2007.浅埋小净距偏压隧道施工工序的数值分析[J].中南大学学报(自然科学版),38(4):764-770.
周玉宏,赵燕明,程崇国.2002.偏压连拱隧道施工过程的优化研究[J].岩石力学与工程学报,21(5):679-683.
Fang Q,Song H R,Zhang D L.2015.Complex variable analysis for stress distribution of an underwater tunnel in an elastic half plane[J].International Journal for Numerical&Analytical Methods in Geomechanics,39(16):1821-1835.
Feng M H,He Z N.2014.Engineering geological problems of deformation and destabilization of surrounding rocks in railway tunnel construction[J].Journal of Engineering Geology,22(4):677-683.
Gao P K,Xu L S,Wu H B.2013.Numerical analysis of construction behavior of a shallow and unsymmetrical loading portal in tunnel with weak rockmass[J].Highway,17(3):205-211.
Gao P K,Xie Y L,Wu H B.2012.Numerical analysis of a shallowburied portal in expressway tunnel with weak rockmass[J].Applied Mechanics&Materials,259:1369-1372.
Li P F,Zhao Y,Liu J Y.2014.Deformation characteristics and control method of tunnel with weak surrounding rock[J].China Railway Science,35(5):55-61.
Li Y,Emeriault F,Kastner R,et al.2009.Stability analysis of large slurry shield-driven tunnel in soft clay[J].Tunnelling&Underground Space Technology,24(4):472-481.
Li Z.2013.Midas/GTS in geotechnical engineering[M].Beijing:China Architecture&Building Press:107-124.
Liu X J,Zhang Y X.2011.Analysis of reasonable excavation sequence and stress characteristics of portal section of shallow tunnel with unsymmetrical loadings[J].Chinese Journal of Rock Mechanics and Engineering,30(S1):3066-3073.
Liu Y X,Jiang S P,Zhao S Y.2005.Optimizing analysis for construction schemes of shallow multi-arch loess tunnel[J].Chinese Journal of Underground Space and Engineering,1(6):944-947.
Shi X,Zhang J S,Liu B C.2015.A study on the construction sequences of a large-section shallow-buried unsymmetrical loading tunnel by the CRD method[J].Modern Tunnelling Technology,52(3):193-199.
Su P S,Xu Q W,Chen G Z,et al.2015.Study on the numerical simulation and field monitoring of soft rock tunnel entrance constructed by CRD method in red layer[J].Chinese Journal of Underground Space and Engineering,11(S2):785-791.
Sun Y,Chen J P,Yu L,et al.2013.Analysis of the large deformation mechanism of a shallow-buried unsymmetrical loading tunnel in soft rock and construction controls[J].Modern Tunnelling Technology,50(5):169-174.
Wang J,Li S C,Shi B,et al.2013.Trifarious FBG sensor strain transfer characteristics and its application to tunnel excavation model test[J].Journal of Engineering Geology,21(2):182-189.
Wang W,Zou J H,Pan W S,et al.2016.Study on influence to stability of surrounding rock by different construction sequence for bias tunnel with small interval and steep slope[J].Journal of Safety Science and Technology,12(8):28-33.
Xu S C,Liu T Y,Jin C Y.2013.Study on excavation procedure of Dawangou shallow tunnel under unsymmetrical pressure[J].Applied Mechanics&Materials,353-356,1539-1542.
Yang X L,Sui Z R.2007.Numerical simulation of construction sequence for shallow embedded bias tunnels with small clear distance[J].Journal of Central South University(Science and Technology),38(4):764-770.
Zhou Y H,Zhao Y M,Cheng C G.2002.Optimum analysis on the construction process for joint arch tunnels in partial pressure[J].Chinese Journal of Rock Mechanics and Engineering,21(5):679-683.
达晓伟,邵珠山,高怀鹏,等.2016.鄂北地区隧道洞口坡积土边、仰坡变形机制与进洞技术研究[J].工程地质学报,24(3):465-476.
丰明海,何振宁.2014.铁路隧道施工中围岩变形失稳工程地质问题[J].工程地质学报,22(4):677-683.
李鹏飞,赵勇,刘建友.2014.隧道软弱围岩变形特征与控制方法[J].中国铁道科学,35(5):55-61.
李治.2013.Midas/GTS在岩土工程中应用[M].北京:中国建筑工业出版社:107-124.
刘小军,张永兴.2011.浅埋偏压隧道洞口段合理开挖工序及受力特征分析[J].岩石力学与工程学报,30(S1):3066-3073.
刘元雪,蒋树屏,赵尚毅.2005.浅埋黄土连拱隧道施工方案优化研究[J].地下空间与工程学报,1(6):944-947.
石熊,张家生,刘宝琛.2015.大断面浅埋偏压隧道CRD法施工工序研究[J].现代隧道技术,52(3):193-199.
苏培森,徐前卫,陈国中,等.2015.“红层”软岩隧道进口段CRD法数值模拟及现场实测研究[J].地下空间与工程学报,11(S2):785-791.
孙洋,陈建平,余莉,等.2013.浅埋偏压隧道软岩大变形机理及施工控制分析[J].现代隧道技术,50(5):169-174.
王静,李术才,施斌,等.2013.三向FBG应变传感器及在隧道开挖模型试验中的应用研究[J].工程地质学报,21(2):182-189.
王薇,邹江海,潘文硕,等.2016.不同施工顺序对陡坡偏压小净距隧道围岩稳定性的影响研究[J].中国安全生产科学技术,12(8):28-33.
杨小礼,眭志荣.2007.浅埋小净距偏压隧道施工工序的数值分析[J].中南大学学报(自然科学版),38(4):764-770.
周玉宏,赵燕明,程崇国.2002.偏压连拱隧道施工过程的优化研究[J].岩石力学与工程学报,21(5):679-683.
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