郑万高铁隧道大型机械化配套全断面法施工围岩-支护结构相互作用力学特性研究
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摘要
为研究郑万高铁大型机械化配套全断面法施工围岩-支护结构相互作用力学特性,依托郑万高铁隧道现场实测数据,确定台阶法和大型机械化配套全断面法2种工法施工的围岩压力分布特征,并采用数值模拟的方法建立围岩-支护结构有限元模型,分析2种工法对围岩压力和结构内力的影响规律。研究结果表明:1)台阶法多次施工扰动易导致支护结构和围岩之间产生空隙而发生脱空,大型机械化配套全断面法施工对围岩扰动次数少,初期支护快速封闭成环,可保证初期支护及围岩之间良好的密贴性;2)在软弱围岩中,采用大型机械化配套全断面法施工比台阶法更有利于改善结构受力,减缓结构内部偏心受压的程度,能有效发挥拱形隧道结构承载力;3)大型机械化配套全断面法在软弱围岩快速施工、控制支护结构变形、保证支护结构受力安全等方面具有综合优势。
The distribution characteristics of surrounding rock pressure of tunnels on Zhengzhou-Wanzhou High-speed Railway constructed by bench method and full-section method with large-scale machinery are determined based on monitoring data. And then the finite element model of surrounding rock-supporting structure is established by numerical simulation to analyze the influence of the construction methods on surrounding rock pressure and internal force of the structure. The results show that:( 1) The bench method would easily lead to the voids between supporting structures and surrounding rocks due to multiple construction times; while the full-section method with large-scale machinery disturbs surrounding rock little,and the primary support closure is rapid,which can ensure good tightness between primary support and surrounding rock.( 2) In soft surrounding rock,the full-section method with large-scale machinery is superior to bench method in improving the structure stress,reducing the degree of eccentricity and compression inside the structure,and giving full play to the bearing capacity of the arch tunnel structure.( 3) The full-section method with large-scale machinery has comprehensive advantages in rapid construction of weak surrounding rock,deformation control of supporting structure and safety guarantee of supporting structure.
The distribution characteristics of surrounding rock pressure of tunnels on Zhengzhou-Wanzhou High-speed Railway constructed by bench method and full-section method with large-scale machinery are determined based on monitoring data. And then the finite element model of surrounding rock-supporting structure is established by numerical simulation to analyze the influence of the construction methods on surrounding rock pressure and internal force of the structure. The results show that:( 1) The bench method would easily lead to the voids between supporting structures and surrounding rocks due to multiple construction times; while the full-section method with large-scale machinery disturbs surrounding rock little,and the primary support closure is rapid,which can ensure good tightness between primary support and surrounding rock.( 2) In soft surrounding rock,the full-section method with large-scale machinery is superior to bench method in improving the structure stress,reducing the degree of eccentricity and compression inside the structure,and giving full play to the bearing capacity of the arch tunnel structure.( 3) The full-section method with large-scale machinery has comprehensive advantages in rapid construction of weak surrounding rock,deformation control of supporting structure and safety guarantee of supporting structure.
引文
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[3]何健,魏碧辉,谭张琴.隧道全断面施工数值模拟[J].山西建筑,2009,35(3):293.HE Jian,WEI Bihui,TAN Zhangqin.Numerical simulation of full-section construction of tunnel[J].Shanxi Architecture,2009,35(3):293.
[4]李利平,李术才,赵勇,等.超大断面隧道软弱破碎围岩渐进破坏过程三维地质力学模型试验研究[J].岩石力学与工程学报,2012,31(3):550.LI Liping,LI Shucai,ZHAO Yong,et al.3D geomechanical model for progressive failure progress of weak broken surrounding rock in super large section tunnel[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(3):550.
[5]谢雄耀,卢晓智,田海洋,等.基于地面三维激光扫描技术的隧道全断面变形测量方法[J].岩石力学与工程学报,2013,32(11):2214.XIE Xiongyao,LU Xiaozhi,TIAN Haiyang,et al.Development of a modeling method for monitoring tunnel deformation based on terrestrial 3D laser scanning[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(11):2214.
[6]何荷,王鹏.隧道全断面开挖下穿边坡的安全距离分析[J].中外公路,2014,34(3):217.HE He,WANG Peng.Safety distance analysis of slope under full-section excavation of tunnel[J].Journal of China&Foreign Highway,2014,34(3):217.
[7]赵明阶,徐容,许锡宾.岩溶区全断面开挖隧道围岩变形规律及其监测[J].同济大学学报(自然科学版),2004,32(7):866.ZHAO Mingjie,XU Rong,XU Xibin.Deformation analysis and monitoring of surrounding rock during full-face excavation of tunnel in karst regions[J].Journal of Tongji University(Natural Science),2004,32(7):866.
[8]赵明阶,徐容,许锡宾.岩溶区全断面开挖隧道围岩变形特性模拟[J].同济大学学报(自然科学版),2004,32(6):710.ZHAO Mingjie,XU Rong,XU Xibin.Deformation modeling of surrounding-rock during full-face excavation of tunnel in karst regions[J].Journal of Tongji University(Natural Science),2004,32(6):710.
[9]徐前卫,丁文其,朱合华,等.超大断面隧道软弱围岩卸荷渐进破坏特性研究[J].土木工程学报,2017,50(1):104.XU Qianwei,DING Wenqi,ZHU Hehua,et al.Study of progressive unloading failure characteristics of superlarge tunnel in soft and weak rock mass[J].China Civil Engineering Journal,2017,50(1):104.
[10]周亚宇.大别山隧道围岩破碎带全断面开挖施工方案研究[J].隧道建设,2006,26(4):54.ZHOU Yayu.Study of full-face construction scheme of fractured section of Dabieshan Tunnel[J].Tunnel Construction,2006,26(4):54.