既有浅埋公路隧道原位扩容围岩变形
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摘要
针对既有浅埋公路隧道原位扩容方式对围岩变形影响程度问题,采用FLAC3D数值模拟软件,对既有浅埋公路隧道单侧扩容方式和均匀扩容方式对隧道围岩变形的影响进行数值模拟分析研究.研究结果表明:既有公路隧道均匀扩容方式下的顶底板收敛量大于单侧扩容方式下的顶底板收敛量,而均匀扩容方式下的两帮收敛量小于单侧扩容方式下的两帮收敛量;既有公路隧道原位扩容可导致围岩产生一定量的变形,但变形量未对隧道安全性造成明显影响.在围岩属于稳定级别时,扩容方式对围岩变形影响不明显,在施工时只需进行常规支护.
Aimed at the influence degree of the in-situ expansion of the existing shallow highway tunnel on the surrounding rock deformation,the numerical simulation software FLAC3 Dis applied to simulate and analyze the influence of the uniform expansion way and the unilateral expansion way of the existing shallow highway tunnel on the surrounding rock deformation. Research results show that the convergence rate of the top and bottom roof under the uniform expansion way is larger than that of the single side expansion way,while the convergence rate of the two sides under the uniform expansion way is less than that under the unilateral expansion way. The insitu expansion of highway can lead to produce a certain amount of deformation,but it does not affect the safety of tunnel. When it is at the stable level,the expansion mode of surrounding rock deformation is not obvious. In construction,it is only necessary to carry out conventional support.
Aimed at the influence degree of the in-situ expansion of the existing shallow highway tunnel on the surrounding rock deformation,the numerical simulation software FLAC3 Dis applied to simulate and analyze the influence of the uniform expansion way and the unilateral expansion way of the existing shallow highway tunnel on the surrounding rock deformation. Research results show that the convergence rate of the top and bottom roof under the uniform expansion way is larger than that of the single side expansion way,while the convergence rate of the two sides under the uniform expansion way is less than that under the unilateral expansion way. The insitu expansion of highway can lead to produce a certain amount of deformation,but it does not affect the safety of tunnel. When it is at the stable level,the expansion mode of surrounding rock deformation is not obvious. In construction,it is only necessary to carry out conventional support.
引文
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[14]Barla G. Full-face excavation of large tunnels in difficult conditions[J]. Journal of Rock Mechanics and Geotechnical Engineering,2016,8:294-303.
[2]Fang Y,Guo J,Grasmick J,et al. The effect of external water pressure on the liner behavior of large cross-section tunnels[J].Tunnelling and Underground Space Technology,2016,60:80-95.
[3]W R Abdellah,M A Ali,H S Yang.Studying the effect of some parameters on the stability of shallow tunnels[J].Journal of Sustainable Mining,2018,17:20-33.
[4]Yang Y,Zhang W,Wang J,et al. Three-dimensional orthotropic equivalent modelling method of large-scale circular jointed lining[J]. Tunnelling and Underground Space Technology,2014,44:33-41.
[5]张海忠,李明.高速公路隧道拓宽方案研究[J].公路交通技术,2010(6):105-107.
[6]高干,刘元雪,周结中,等.地下空间扩建型式研究[J].现代隧道技术,2010,7(6):1-8.
[7]来弘鹏,徐学深,常瑞成,等.公路隧道扩建力学特征研究[J].中国公路报,2014,27(1):84-92.
[8]胡居义,黄伦海.原位扩建隧道围岩变形及力学特征研究[J].公路交通技术,2011(6):83-87.
[9]Das R,Singh P K,Kainthola A,et al. Numerical analysis of surface subsidence in asymmetric parallel highway tunnels[J].Journal of Rock Mechanics and Geotechnical Engineering,2017,9:170-179.
[10]Lin C,Wu S,Xia T. Design of shield tunnel lining taking fluctuations of river stage into account[J]. Tunnelling and Underground Space Technology,2015,45:107-127.
[11]Yuan C,Wang X,Wang N,et al. Study on the Effect of Tunnel Excavation on Surface Subsidence Based on GIS Data Management[J].Procedia Environmental Sciences,2012,12:1387-1392.
[12]金波,韩常领,王万平,等.既有隧道改建施工的安全风险及对策[J].公路,2008(7):269-271.
[13]朱根桥,林志,朱育,等.隧道原位扩建对邻近建筑物影响评估的研究[J].岩土力学,2012,33(s2):251-256.
[14]Barla G. Full-face excavation of large tunnels in difficult conditions[J]. Journal of Rock Mechanics and Geotechnical Engineering,2016,8:294-303.