基于数值模拟的深埋输水隧洞支护研究与安全评价
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摘要
结合国内外的研究成果,研究不同支护情况下隧洞掌子面的安全情况,运用FLAC3D软件模拟不同围岩条件和二次衬砌厚度下隧洞水平收敛值与拱顶沉降值,总结出隧洞开挖的一般规律。同时计算二次衬砌的安全系数,得出了最危险截面的位置,进行二次衬砌不同位置的安全评价。通过数值分析与以往的施工经验,给出输水隧洞的不同围岩区域的支护方式,并给出全隧洞的安全评价,提出施工建议措施。
According to the domestic and foreign research achievements,the safety of tunnel face under different supporting conditions was studied in such manner that,with FLAC3 D software,the horizontal convergence and vault subsidence of tunnel in different surrounding rock conditions and different secondary lining thickness,were simulated so as to summarize the general law of tunneling;at the same time,the safety coefficient of secondary lining was calculated to find out the most dangerous section and make the safety evaluation on different parts of the secondary lining.Depending on the numerical analysis and the previous construction experience,the supporting method in different rock areas along water-conveyance tunnel was provided with the safety evaluation on the tunnel and the suggestions on the construction measures.
According to the domestic and foreign research achievements,the safety of tunnel face under different supporting conditions was studied in such manner that,with FLAC3 D software,the horizontal convergence and vault subsidence of tunnel in different surrounding rock conditions and different secondary lining thickness,were simulated so as to summarize the general law of tunneling;at the same time,the safety coefficient of secondary lining was calculated to find out the most dangerous section and make the safety evaluation on different parts of the secondary lining.Depending on the numerical analysis and the previous construction experience,the supporting method in different rock areas along water-conveyance tunnel was provided with the safety evaluation on the tunnel and the suggestions on the construction measures.
引文
[1]中铁二十一局引汉济渭秦岭输水隧洞项目部.引汉济渭秦岭输水隧洞黄三段I标工程施工报告[R].陕西:中铁二十一局,2016.
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[12]陈峰宾.隧道初期支护与软弱围岩作用机理及应用[D].北京:北京交通大学,2012.CHEN F B.Mechanism and application of initial support and weak surrounding rock in tunnel[D].Beijing:Beijing Jiaotong University,2012.
[2]徐技猛,潘仁伟.关于水工隧道衬砌施工技术的探讨[J].广东科技,2013,22(22):153-154.
[3]SL 297-2002水工隧洞设计规范[S].北京:中国水利水电出版社,2003.SL 297-2002 Specification for Design of Hydraulic Tunnel[S].Beijing:China Water&Power Press,2003.
[4]何可.水工隧洞施工技术初探[J].黑龙江水利科技,2013,41(7):90-92.
[5]关宝树.隧道工程施工要点集[M].北京:人民交通出版社,2003.
[6]关宝树.隧道工程设计要点集[M].北京:人民交通出版社,2003.
[7]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2013.
[8]彭文斌.FLAC3D使用教程[M].北京:机械工业出版社,2007.
[9]密士文,龚书林.隧道监控量测的数据处理及分析[J].中国西部科技,2010,9(1):32-33,50.
[10]李鹏飞,张顶立,赵勇,等.大断面黄土隧道二次衬砌受力特性研究[J].岩石力学与工程学报,2010,29(8):1690-1696.LI P F,ZHANG D L,ZHAO Y,et al.Study of mechanical characteristics of secondary lining of large-section loess tunnel[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(8):1690-1696.
[11]李明,陈洪凯.隧道衬砌厚度不足的健康判据试验研究[J].岩土力学,2011,32(增刊1):570-577.LI M,CHEN H K.Experimental research on tunnel health criterion of deficiency in lining thickness[J].Rock and Soil Mechanics,2011,32(S1):570-577.
[12]陈峰宾.隧道初期支护与软弱围岩作用机理及应用[D].北京:北京交通大学,2012.CHEN F B.Mechanism and application of initial support and weak surrounding rock in tunnel[D].Beijing:Beijing Jiaotong University,2012.