丹巴水电站引水隧洞衬砌结构安全与围岩稳定性分析
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摘要
依托丹巴水电站引水隧洞工程,研究锚杆和衬砌对围岩稳定性的影响,进行了不同埋深下隧洞衬砌厚度的比选和衬砌的安全性分析、配筋和裂缝宽度验算等,考虑了不同衬砌施加时机对隧洞受力及位移的影响。研究发现,锚杆支护可使围岩塑性区分布更加均匀,受力更加合理,可较好的控制围岩变形;衬砌内最大压应力值随着埋深增加而增大,随着衬砌厚度增加而降低;提出了有效减压区,应在有效减压区选择衬砌厚度,衬砌厚度选1.5m为宜;在最危险工况下,给出了合理的配筋设计方案;经过不同位移量和不同模型下衬砌安全性的对比分析,衬砌加固选择85%的位移预留量,围岩的变形量和最大控制内力都可得到明显的控制。
The influences of bolt and lining on the stability of its surrounding rock are investigated in this study for the diversion tunnel of Danba Hydropower Station.The thickness of tunnel lining under different buried depths are investigated,and the safety of lining under different working conditions is analyzed.The reinforcement and the crack width are checked,and the influences of different lining application time on the force and displacement of the tunnel are taken into consideration.It is found that the bolt supporter can make the distribution of the plastic zone of its surrounding rocks more uniform and the force is more reasonable,which could control the deformation of the surrounding rock better.The maximum compressive stress in the lining will increases with depth,and decreases with the lining thickness.An effective decompression zone is proposed,which should be selected within the effective decompression zone.The lining thickness is preferred at 1.5 m.In the most dangerous conditions,a reasonable design scheme of reinforcement is given.By comparing and analyzing the safety of lining under different displacement and different models,85% displacement reserve is chosen for lining reinforcement,and the deformation and maximum internal force of surrounding rock can be obviously controlled.
The influences of bolt and lining on the stability of its surrounding rock are investigated in this study for the diversion tunnel of Danba Hydropower Station.The thickness of tunnel lining under different buried depths are investigated,and the safety of lining under different working conditions is analyzed.The reinforcement and the crack width are checked,and the influences of different lining application time on the force and displacement of the tunnel are taken into consideration.It is found that the bolt supporter can make the distribution of the plastic zone of its surrounding rocks more uniform and the force is more reasonable,which could control the deformation of the surrounding rock better.The maximum compressive stress in the lining will increases with depth,and decreases with the lining thickness.An effective decompression zone is proposed,which should be selected within the effective decompression zone.The lining thickness is preferred at 1.5 m.In the most dangerous conditions,a reasonable design scheme of reinforcement is given.By comparing and analyzing the safety of lining under different displacement and different models,85% displacement reserve is chosen for lining reinforcement,and the deformation and maximum internal force of surrounding rock can be obviously controlled.
引文
[1]吴世勇,任旭华,陈祥荣,等.锦屏二级水电站引水隧洞围岩稳定分析及支护设计[J].岩石力学与工程学报,2005(20):179-184.(WU S Y,REN X H,CHEN X R,et al.Stability analysis and supporting design of surrounding rocks of diversion tunnel for Jinping Hydropower Station[J].Chinese Journal of Rock Mechanics and Engineering,2005(20):179-184.(in Chinese))DOI:10.3321/j.issn:1000-6915.2005.20.028.
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[9]徐前卫,程盼盼,朱合华,等.深埋隧道软弱围岩渐进性破坏及其锚固效应试验与模拟[J].岩土工程学报,2017,39(4):617-625.(XU Q W,CHENG P P,ZHUH H,et al.Experimental and numerical studies on progressive failure characteristics of weak surrounding rock mass of tunnel and its anchoring effect[J].Chinese Journal of Geotechnical Engineering,2017,39(4):617-625.(in Chinese))DOI:10.11779/CJGE201704005.
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[11]李晓红,李登新,靳晓光,等.初期支护对软岩隧道围岩稳定性和位移影响分析[J].岩土力学,2005(8):1207-1210.(LI X H,LI D X,JIN X G,et al.Discussion on influence of initial support to stability and deformation of surrounding rock mass in soft rock tunnel[J].Rock and Soil Mechanics,2005(8):1207-1210.(in Chinese))DOI:10.3969/j.issn.1000-7598.2005.08.006.
[12]罗生虎,伍永平,张嘉凡.围岩-锚固体流变控制机制及支护最优化设计[J].岩土力学,2017,38(1):124-132.(LUO S H,WU Y P,ZHANG J F.Rheology control mechanism of surrounding rock mass and anchorage body and its support design optimization[J].Rock and Soil Mechanics,2017,38(1):124-132.(in Chinese)).DOI:10.16285/j.rsm.2017.01.016.
[13]罗生虎,伍永平,解盘石.二次支护围岩-支护结构耦合作用黏弹性解析[J].中国矿业大学学报,2017,46(3):528-536.(LUO S H,WU Y P,XIE P S.Viscoelastical analysis on interaction between surrounding rock mass and liners of two support processes[J].Journal of China University of Mining&Technology,2017,46(3):528-536.(in Chinese))
[14]WANG H,CHEN W Z,WANG Q B,et al.Rheological properties of surrounding rock in deep hard rock tunnels and its reasonable support form[J].Journal of Central South University,2016,23(4):898-905.(in Chinese)DOI:10.1007/s11771-016-3137-6.
[15]谢锋,蒋树屏,李建军.蠕变围岩隧道二次衬砌支护时间的研究[J].地下空间与工程学报,2006(5):805-808.(XIE F,JIANG S P,LI J J.Research on quadratic lining time for creeping rock tunnel[J].Chinese Journal of Underground Space and Engineering,2006(5):805-808.(in Chinese))
[16]Itasca Consulting Group Inc.FLAC3D(Fast Lagrangian Analysis of Continua in 3Dimension)User′s Manuals Version 2.1[Z].Mineapolis,Minnesota,2002.
[2]张文举,卢文波,杨建华,等.深埋隧洞开挖卸荷引起的围岩开裂特征及影响因素[J].岩土力学,2013,34(9):2690-2698.(ZHANG W J,LU W B,YANG J H,et al.Cracking characteristics and influential factors of surrounding rocks induced by excavation unloading in deep tunnel[J].Rock and Soil Mechanics,2013,34(9):2690-2698.(in Chinese))
[3]董书明,辛全才,卢树盛.断面形状对隧洞围岩稳定性的影响分析[J].中国农村水利水电,2011(1):102-104,107.(DONG S M,XIN Q C,LU S S,The Influence of The Tunnel Cross-section Shape on Stability of Surrounding Rocks[J].China Rural Water and Hydropower,2011(1):102-104,107.(in Chinese))
[4]庄宁,朱合华,杨向东,等.高水压下隧洞合理断面形状研究[J].地下空间与工程学报,2005(5):713-716.(ZHUANG N,ZHU H H,YANG X D,et al.Research on proper cross section shape of high water pressure tunnel[J].Chinese Journal of Underground Space and Engineering,2005(5):713-716.(in Chinese))
[5]王家兴.石英云母片岩各向异性特征及其对围岩稳定性影响的研究[D].成都:成都理工大学,2014.(WANG J X.Effect on the stability of the surrounding rock[D].Chengdu:Chengdu University of Technology,2014.(in Chinese))
[6]周翠英,张亮,黄显艺.基于改进BP网络算法的隧洞围岩分类[J].地球科学,2005(4):480-486.(ZHOU CY,ZHANG L,HUANG X Y.Classification of Rocks Surrounding Tunnel Based on Improved BP Network Algorithm[J].Earth Science,2005(4):480-486.(in Chinese))
[7]原先凡,邓华锋,宛良朋,等.埋深及断面尺寸对隧洞围岩稳定性的影响[J].人民黄河,2013,35(3):100-102.(YUAN X F,DENG H F,WAN L P,et al.Research on the effect of the stability of tunnel’s surrounding rock linking to buried depth and section size[J].Yellow River,2013,35(3):100-102.(in Chinese))DOI:doi:10.3969/j.issn.1000-1379.2013.03.033.
[8]吴剑,仇文革.隧道衬砌厚度分布规律及结构可靠性分析[J].现代隧道技术,2004(1):22-25.(WU J,QIU WG.Regularity of the distribution of the thickness of tunnel linings and structure reliability analysis[J].Modern Tunnelling Technology,2004(1):22-25.(in Chinese))
[9]徐前卫,程盼盼,朱合华,等.深埋隧道软弱围岩渐进性破坏及其锚固效应试验与模拟[J].岩土工程学报,2017,39(4):617-625.(XU Q W,CHENG P P,ZHUH H,et al.Experimental and numerical studies on progressive failure characteristics of weak surrounding rock mass of tunnel and its anchoring effect[J].Chinese Journal of Geotechnical Engineering,2017,39(4):617-625.(in Chinese))DOI:10.11779/CJGE201704005.
[10]LUO W H,LI W T.Reliability analysis of supporting pressure in tunnels based on three-dimensional failure mechanism[J].Journal of Central South University,2016(5):1243-1252.(in Chinese)DOI:10.1007/s11771-016-0374-7.
[11]李晓红,李登新,靳晓光,等.初期支护对软岩隧道围岩稳定性和位移影响分析[J].岩土力学,2005(8):1207-1210.(LI X H,LI D X,JIN X G,et al.Discussion on influence of initial support to stability and deformation of surrounding rock mass in soft rock tunnel[J].Rock and Soil Mechanics,2005(8):1207-1210.(in Chinese))DOI:10.3969/j.issn.1000-7598.2005.08.006.
[12]罗生虎,伍永平,张嘉凡.围岩-锚固体流变控制机制及支护最优化设计[J].岩土力学,2017,38(1):124-132.(LUO S H,WU Y P,ZHANG J F.Rheology control mechanism of surrounding rock mass and anchorage body and its support design optimization[J].Rock and Soil Mechanics,2017,38(1):124-132.(in Chinese)).DOI:10.16285/j.rsm.2017.01.016.
[13]罗生虎,伍永平,解盘石.二次支护围岩-支护结构耦合作用黏弹性解析[J].中国矿业大学学报,2017,46(3):528-536.(LUO S H,WU Y P,XIE P S.Viscoelastical analysis on interaction between surrounding rock mass and liners of two support processes[J].Journal of China University of Mining&Technology,2017,46(3):528-536.(in Chinese))
[14]WANG H,CHEN W Z,WANG Q B,et al.Rheological properties of surrounding rock in deep hard rock tunnels and its reasonable support form[J].Journal of Central South University,2016,23(4):898-905.(in Chinese)DOI:10.1007/s11771-016-3137-6.
[15]谢锋,蒋树屏,李建军.蠕变围岩隧道二次衬砌支护时间的研究[J].地下空间与工程学报,2006(5):805-808.(XIE F,JIANG S P,LI J J.Research on quadratic lining time for creeping rock tunnel[J].Chinese Journal of Underground Space and Engineering,2006(5):805-808.(in Chinese))
[16]Itasca Consulting Group Inc.FLAC3D(Fast Lagrangian Analysis of Continua in 3Dimension)User′s Manuals Version 2.1[Z].Mineapolis,Minnesota,2002.