抗水压多层衬砌分析模型及其应用研究
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摘要
隧道穿越岩溶多发地段时易承受较大水压荷载作用,相对传统的复合衬砌,抗水压多层衬砌可设置二道防水板,保证了衬砌的施工质量。基于此,文章提出了抗水压多层衬砌的分析模型,通过实例分析得出,内、外层衬砌间仅压弹簧的弹簧刚度系数增加时,内、外层衬砌弯矩基本不变,外层衬砌轴力减小,偏心距增大;内层衬砌轴力增加,偏心距减小。当水压荷载增加时,衬砌拱顶由大偏心受压状态变成小偏心受压,再逐渐逼至抗压极限承载状态,安全系数先增后减;拱腰、边墙处逐渐逼至抗压极限承载状态,安全系数逐渐减小;拱脚、仰拱处由小偏心受压状态变成大偏心受压状态,安全系数逐渐减小。
Compared with the conventional composite lining, the multi-layer lining loaded by large water pressure can reserve one more waterproof board and guarantee its construction quality when tunnel passes through karstprone section. This paper sets forth an analysis model of the multi-layer lining and comes to the following conclusions through a case study: when stiffness coefficient of the compression-only spring between inner lining and outer lining increases, bending moments of the inner and outer lining are basically unchanged and axial force of outer lining decreases and eccentricity increases while axial force of inner lining increases and eccentricity decreases. When water pressure load increases, the state of lining vault transfers from large eccentric compression into small eccentric compression state and then approaches compressive ultimate load bearing state and the safety factors increase at first and then decreases; state of haunch and side wall gradually approaches the ultimate load bearing state and the safety factors gradually reduce; the states of arch foot and inverted arch transfer from small eccentric compression to large eccentric compression and the safety factors gradually reduce.
Compared with the conventional composite lining, the multi-layer lining loaded by large water pressure can reserve one more waterproof board and guarantee its construction quality when tunnel passes through karstprone section. This paper sets forth an analysis model of the multi-layer lining and comes to the following conclusions through a case study: when stiffness coefficient of the compression-only spring between inner lining and outer lining increases, bending moments of the inner and outer lining are basically unchanged and axial force of outer lining decreases and eccentricity increases while axial force of inner lining increases and eccentricity decreases. When water pressure load increases, the state of lining vault transfers from large eccentric compression into small eccentric compression state and then approaches compressive ultimate load bearing state and the safety factors increase at first and then decreases; state of haunch and side wall gradually approaches the ultimate load bearing state and the safety factors gradually reduce; the states of arch foot and inverted arch transfer from small eccentric compression to large eccentric compression and the safety factors gradually reduce.
引文
[1]张厚美,连烈坤,过迟.盾构隧洞双层衬砌接头相互作用模型[J].岩石力学与工程学报,2003,22(1):70-74.ZHANG Houmei,LIAN Liekun,GUO Chi.Joint Interaction Models for Shield Tunnel Segment Reinforced by Secondary Lining[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(1):70-74.
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[8]谢小玲,龚亚琦,苏海东,等.软弱围岩中的新型双层复合衬砌的受力特性研究及渗水风险分析[J].岩石力学与工程学报,2013,32(9):1791-1798.XIE Xiaoling,GONG Yaqi,SU Haidong,et al.Mechanical Characteristics and Seepage Risk Analysis of Double Composite Lining in Soft Surrounding Rocks[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(9):1791-1798.
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[10]何英杰,张述琴,吕国梁.穿黄隧道内外层衬砌联合受力结构模型试验研究[J].长江科学院院报,2002,19(B09):64-67.HE Yingjie,ZHANG Shuqin,LV Guoliang.Experiment Research on United Action of Inside and Outside Liner of Yellow Rivercrossing Tunnel of Water Transfer Project from South to North[J].Journal of Yangtze River Scientific Research Institute,2002,19(B09):64-67.
[11]丁浩,蒋树屏,杨林德.外水压下隧道衬砌的力学响应及结构对策研究[J].岩土力学,2008,29(10):2799-2804.DING HAO,JIANG Shuping,YANG Linde.Research on Mechanical Response and Structural Countermeasure of Tunnel Lining under External Water Pressure[J].Rock and Soil Mechanics,2008,29(10):2799-2804.
[12]张宇,万晓燕,陈礼伟.圆梁山隧道溶洞地段抗水压衬砌结构试验分析[J].中国铁道科学,2006,27(4):62-67.ZHANG Yu,WAN Xiaoyan,CHEN Liwei.Analysis on Structural Test of Lining against Water Pressure at the Karst Section of Yuanliangshan Tunnel[J].China Railway Science,2006,27(4):62-67.
[2]姚超凡,晏启祥,何川,等.一种改进的盾构隧道双层衬砌分析模型及其应用研究[J].岩石力学与工程学报,2014,33(1):80-89.YAO Chaofan,YAN Qixiang,HE Chuan,et al.An Improved Analysis Mode for Shield Tunnel with Double-layer Lining and Its Applications[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(1):80-89.
[3]刘学增,桑运龙,包浩杉.叠合式套拱加固带裂缝隧道衬砌受力机理分析[J].土木工程学报,2013,46(10):127-134.LIU Xuezeng,SANG Yunlong,BAO Haoshan.Analysis of Bearing Mechanism of Cracked Tunnel Lining Reinforced with Stacked Umbrella Arch[J].China Civil Engineering Journal,2013,46(10):127-134.
[4]何川,李祖伟,佘健,等.组合补强对缺陷病害隧道结构承载力影响的室内模型试验研究[J].公路,2007,(3):195-202.HE Chuan,LI Zuwei,SHE Jian,et al.Research on Indoor Model Test about Effect of Combined Reinforcing on Structure Bearing Capacity of Defect and Disease Tunnel[J].Highway,2007,(3):195-202.
[5]邓亚虹,彭建兵,范文,等.地裂缝活动环境下盾构隧道双层衬砌性状分析[J].岩石力学与工程学报,2008,27(增2):3861-3867.DENG Yahong,PENG Jianbing,FAN Wen,et al.Analysis of Double-layer Liner′s Behaviors of Shield Tunnel under Active Moving Ground-fissures[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(S2):3861-3867.
[6]晏启祥,程曦,何川,等.水压条件下盾构隧道双层衬砌力学特性分析[J].铁道工程学报,2010,27(9):55-59.YAN Qixiang,CHENG Xi,HE Chuan,et al.Analysis of Mechanical Properties of Double-layered Lining of Shield Tunnel under Water Pressure[J].Journal of Railway Engineering Society,2010,27(9):55-59.
[7]张厚美.装配整体式双层衬砌接头荷载试验与结构计算理论──南水北调中线穿黄隧洞结构计算模型研究[J].岩石力学与工程学报,2002,(2):298-298.ZHANG Houmei.Research on the Loading Test and Structural Models of Prefabricated Segment Reinforced by Secondary Lining[J].Chinese Journal of Rock Mechanics and Engineering,2002,(2):298-298.
[8]谢小玲,龚亚琦,苏海东,等.软弱围岩中的新型双层复合衬砌的受力特性研究及渗水风险分析[J].岩石力学与工程学报,2013,32(9):1791-1798.XIE Xiaoling,GONG Yaqi,SU Haidong,et al.Mechanical Characteristics and Seepage Risk Analysis of Double Composite Lining in Soft Surrounding Rocks[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(9):1791-1798.
[9]肖明清,孙文昊.考虑环境作用的复合式衬砌结构设计方法探讨[J].铁道工报,2009,(2):55-59.XIAO Mingqing,SUN Wenhao.Research on the Design Methods of Composite Tunnel Lining on Consideration of Environmental Effect[J].Journal of Railway Engineering Society,2009,(2):55-59.
[10]何英杰,张述琴,吕国梁.穿黄隧道内外层衬砌联合受力结构模型试验研究[J].长江科学院院报,2002,19(B09):64-67.HE Yingjie,ZHANG Shuqin,LV Guoliang.Experiment Research on United Action of Inside and Outside Liner of Yellow Rivercrossing Tunnel of Water Transfer Project from South to North[J].Journal of Yangtze River Scientific Research Institute,2002,19(B09):64-67.
[11]丁浩,蒋树屏,杨林德.外水压下隧道衬砌的力学响应及结构对策研究[J].岩土力学,2008,29(10):2799-2804.DING HAO,JIANG Shuping,YANG Linde.Research on Mechanical Response and Structural Countermeasure of Tunnel Lining under External Water Pressure[J].Rock and Soil Mechanics,2008,29(10):2799-2804.
[12]张宇,万晓燕,陈礼伟.圆梁山隧道溶洞地段抗水压衬砌结构试验分析[J].中国铁道科学,2006,27(4):62-67.ZHANG Yu,WAN Xiaoyan,CHEN Liwei.Analysis on Structural Test of Lining against Water Pressure at the Karst Section of Yuanliangshan Tunnel[J].China Railway Science,2006,27(4):62-67.
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