超浅埋小间距隧道穿越既有公路变形规律模拟研究
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摘要
针对下穿既有公路的某超浅埋小间距隧道工程,对入口段的穿越施工过程进行了仿真模拟研究。研究结果表明,浅埋区左、右线隧道整体有左移的趋势,右线最大水平偏移量是左线的6~8倍左右;地表沉降由右洞拱顶地表向左洞延伸形成一沉降槽,右隧道拱顶地表沉降量最大;对存在偏压的浅埋小间距隧道,衬砌结构采用不对称几何形状设计比较有效;从中隔墙到偏压山体与地表交界处形成了明显的剪切带,应为施工期加强支护和监控重点区域。文中所给出的穿越里程段的偏压小间距隧道的变形规律、应力分布及中隔墙和衬砌支护结构的变形特征,以及既有公路路面的沉降规律等,对该工程的安全顺利施工和类似工程的设计与施工均有一定的积极作用。
The construction process of a portal section of a tunnel was simulated based on an existing shallow-buried tunnel with small spacing that passes under a highway. The research results show that: the left and right tubes tended to move to the left, with the maximum horizontal offset of the right tube being 6 to 8 times greater than that of the left tube; the ground settlement extended toward the left tube from the crown of the right tube and a settlement trough was formed, with the maximum ground settlement occurring at the crown of the right tube; a lining design featuring an asymmetrical geometric structure was most effective for a shallow-buried tunnel with small spacing; and a shear zone was formed from the center pillar to the boundary of the massif and ground, therefore support and monitoring should be strengthened in this area. The obtained deformation law, stress distribution, and deformation characteristics of the center pillar and lining support structure, as well as the settlement law of the existing highway surface, will ensure the safe and smooth construction of the project.
The construction process of a portal section of a tunnel was simulated based on an existing shallow-buried tunnel with small spacing that passes under a highway. The research results show that: the left and right tubes tended to move to the left, with the maximum horizontal offset of the right tube being 6 to 8 times greater than that of the left tube; the ground settlement extended toward the left tube from the crown of the right tube and a settlement trough was formed, with the maximum ground settlement occurring at the crown of the right tube; a lining design featuring an asymmetrical geometric structure was most effective for a shallow-buried tunnel with small spacing; and a shear zone was formed from the center pillar to the boundary of the massif and ground, therefore support and monitoring should be strengthened in this area. The obtained deformation law, stress distribution, and deformation characteristics of the center pillar and lining support structure, as well as the settlement law of the existing highway surface, will ensure the safe and smooth construction of the project.
引文
[1]F.Hage Chehade,I.Shahrour.Numerical Analysis of the Interaction between Twin-tunnels:Influence of the Relative Position and Con-struction Procedure[J].Tunnelling and Underground Space Technology,2008,(23):210-214
[2]李云鹏,王芝银,韩常领.不同围岩类别小间距隧道施工过程模拟研究[J].岩土力学,2006,27(1):11-16Li Yunpeng,Wang Zhiyin,Han Changling.Simulating Study on Construction Process of Tunnels with Small Spacing for DifferentClasses of Surrounding Rocks[J].Rock and Soil Mechanics,2006,27(1):11-16
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[7]王怡,王芝银,李云鹏,等.偏压作用下小间距隧道的施工方法研究[J].现代隧道技术,2008,45(3):29-35Wang Yi,Wang Zhiyin,Li Yunpeng,et al.Study on the Construction of Uneven-pressured Twin Tunnels with Small Spacing[J].Mod-ern Tunnelling Technology,2008,45(3):29-35
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[9]张迪.杭州解放路隧道穿越铁路的设计与施工[J].公路隧道,2005,49(1):1-6Zhang Di.Design and Construction of Jiefanglu Tunnel Crossing Exsisting Railway in Hangzhou[J].Road Tunnel,2005,49(1):1-6
[10]陈宇,曾建雄,刘建国,等.既有公路下超浅埋软弱土层四车道隧道施工技术研究[J].铁道标准设计,2005,(10):89-92Chen Yu,Zeng Jianxiong,Liu Jianguo,et al.Research on the Construction Technology for the Four-Track Tunnel on the Super Shal-low Buried Soft Earth under the Existing Road[J].Railway Standard Design,2005,(10):89-92
[11]徐建洋.小净距隧道施工技术及地表沉降的模拟与监测[J].现代隧道技术,2011,48(6):110-116Xu Jianyang.Parallel Tunnels Separated by a Thin Pillar:Construction Technology,Numerical Simulation and Monitoring Analysis ofSurface Settlement[J].Modern Tunnelling Technology,2011,48(6):110-116
[12]刘胜利,施成华,彭立敏,等.小间距隧道施工期间洞室与结构的稳定性评判[J].西部探矿工程,2003,(3):108-111Liu Shengli,Shi Chenghua,Peng Limin,et al.Evaluation on Stability of Chamber and Structure of Small-interval Tunnel during Con-struction[J].West-China Exploration Engineering,2003,(3):108-111
[13]王明年,李志业,刘智成,等.软弱围岩3孔小间距平行浅埋隧道施工力学研究[J].铁道建筑技术,2002,(4):11-14Wang Mingnian,Li Zhiye,Liu Zhicheng,et al.A Study on Construction Mechanics of Three Parallel Shallow Tunnels with Small Spac-ing inWeakSurrounding Rock[J].Railway Construction Technology,2002,(4):11-14
[14]刘洪洲.双洞小净距隧道设计施工的技术应用研究[C].2003年全国公路隧道学术会议论文集,2003Liu Hongzhou.Technical Research of Design and Construction of Twin-bore Tunnels with Small Clear Distance[C].Proceedings of2003Academic Conference of National Road Tunnelling,2003
[15]刘艳青,钟世航,卢汝绥,等.小净距并行隧道力学状态的试验研究[J].岩石力学与工程学报,2000,19(5):590-594Liu Yanqing,Zhong Shihang,Lu Rusui.Experimental Study on Mechanical Characteristics of Twin Tunnels with Small Spacing[J].Chinese Journal of Rock Mechanics and Engineering,2000,19(5):590-594
[16]中交一公院,中国石油大学(北京).小间距隧道设计技术研究报告[R].2008CCCC First Highway Consultants Co.,Ltd,China University of Petroleum(Beijing).Research Report of Design Technique for Tunnelswith Small Spacing[R].2008
[17]苏江.铁路隧道下穿既有公路地层变形特性研究[J].现代隧道技术,2012,49(1):89-95Su Jiang.Study on Characteristics of Stratum Deformation induced by Railway Tunnel Underpassing Existing Highway[J].ModernTunnelling Technology,2012,49(1):89-95
[2]李云鹏,王芝银,韩常领.不同围岩类别小间距隧道施工过程模拟研究[J].岩土力学,2006,27(1):11-16Li Yunpeng,Wang Zhiyin,Han Changling.Simulating Study on Construction Process of Tunnels with Small Spacing for DifferentClasses of Surrounding Rocks[J].Rock and Soil Mechanics,2006,27(1):11-16
[3]靳晓光,刘伟,陈少华,等.小间距隧道施工过程数值模拟[C].2003年全国公路隧道学术会议论文集,2003Jin Xiaoguang,Liu Wei,Chen Shaohua,et al.Numerical Simulation of Construction Process of Tunnel with Small Spacing[C].Pro-ceedings of2003Academic Conference of National Road Tunnelling,2003
[4]张玉军,朱维申,杨家岭.近距离双隧道开挖与支护稳定性的粘弹塑性有限元计算[J].岩石力学与工程学报,1999,(增刊):855-859Zhang Yujun,Zhu Weishen,Yang Jialing.Plane Visco-elasto-plastic FEM Calculation for the Stability of the Excavation and LiningStructure of a Nearby Double Tunnel[J].Chinese Journal of Rock Mechanics and Engineering,1999,(Sup.):855-859
[5]李云鹏,王芝银,韩常领,等.考虑地震影响的小间距隧道围岩流变损伤有限元分析[J].长安大学学报,2006,26(2):51-56Li Yunpeng,Wang Zhiyin,Han Changling,et al.Finite Element Analysis of Rheologic Damage and Earthquake Influence on Surround-ing Rock ofSmall Spacing Tunnels[J].Journal of Chang’an University,2006,26(2):51-56
[6]范国文,王先堂.暗挖双连拱隧道穿越浅基础高层楼群区施工技术[J].铁道工程学报,2003,(3):109-116Fan Guowen,Wang Xiantang.Construction Technique for Subsurface Excavation of Double-Hinged Arch Tunnel Crossing High-RiseBuildings Area with Shallow Foundation[J].Journal of Railway Engineering Society,2003,(3):109-116
[7]王怡,王芝银,李云鹏,等.偏压作用下小间距隧道的施工方法研究[J].现代隧道技术,2008,45(3):29-35Wang Yi,Wang Zhiyin,Li Yunpeng,et al.Study on the Construction of Uneven-pressured Twin Tunnels with Small Spacing[J].Mod-ern Tunnelling Technology,2008,45(3):29-35
[8]曲学兵,苏红卫.超浅埋隧道暗挖施工模拟[J].四川建筑科学研究,2002,28(4):51-53Qu Xuebing,Su Hongwei.Construction Simulation of Underground Excavation about Super-shallow-burial Tunnel[J].Building Sci-ence Research of Sichuan,2002,28(4):51-53
[9]张迪.杭州解放路隧道穿越铁路的设计与施工[J].公路隧道,2005,49(1):1-6Zhang Di.Design and Construction of Jiefanglu Tunnel Crossing Exsisting Railway in Hangzhou[J].Road Tunnel,2005,49(1):1-6
[10]陈宇,曾建雄,刘建国,等.既有公路下超浅埋软弱土层四车道隧道施工技术研究[J].铁道标准设计,2005,(10):89-92Chen Yu,Zeng Jianxiong,Liu Jianguo,et al.Research on the Construction Technology for the Four-Track Tunnel on the Super Shal-low Buried Soft Earth under the Existing Road[J].Railway Standard Design,2005,(10):89-92
[11]徐建洋.小净距隧道施工技术及地表沉降的模拟与监测[J].现代隧道技术,2011,48(6):110-116Xu Jianyang.Parallel Tunnels Separated by a Thin Pillar:Construction Technology,Numerical Simulation and Monitoring Analysis ofSurface Settlement[J].Modern Tunnelling Technology,2011,48(6):110-116
[12]刘胜利,施成华,彭立敏,等.小间距隧道施工期间洞室与结构的稳定性评判[J].西部探矿工程,2003,(3):108-111Liu Shengli,Shi Chenghua,Peng Limin,et al.Evaluation on Stability of Chamber and Structure of Small-interval Tunnel during Con-struction[J].West-China Exploration Engineering,2003,(3):108-111
[13]王明年,李志业,刘智成,等.软弱围岩3孔小间距平行浅埋隧道施工力学研究[J].铁道建筑技术,2002,(4):11-14Wang Mingnian,Li Zhiye,Liu Zhicheng,et al.A Study on Construction Mechanics of Three Parallel Shallow Tunnels with Small Spac-ing inWeakSurrounding Rock[J].Railway Construction Technology,2002,(4):11-14
[14]刘洪洲.双洞小净距隧道设计施工的技术应用研究[C].2003年全国公路隧道学术会议论文集,2003Liu Hongzhou.Technical Research of Design and Construction of Twin-bore Tunnels with Small Clear Distance[C].Proceedings of2003Academic Conference of National Road Tunnelling,2003
[15]刘艳青,钟世航,卢汝绥,等.小净距并行隧道力学状态的试验研究[J].岩石力学与工程学报,2000,19(5):590-594Liu Yanqing,Zhong Shihang,Lu Rusui.Experimental Study on Mechanical Characteristics of Twin Tunnels with Small Spacing[J].Chinese Journal of Rock Mechanics and Engineering,2000,19(5):590-594
[16]中交一公院,中国石油大学(北京).小间距隧道设计技术研究报告[R].2008CCCC First Highway Consultants Co.,Ltd,China University of Petroleum(Beijing).Research Report of Design Technique for Tunnelswith Small Spacing[R].2008
[17]苏江.铁路隧道下穿既有公路地层变形特性研究[J].现代隧道技术,2012,49(1):89-95Su Jiang.Study on Characteristics of Stratum Deformation induced by Railway Tunnel Underpassing Existing Highway[J].ModernTunnelling Technology,2012,49(1):89-95
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