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隧道建设(中英文) ›› 2018, Vol. 38 ›› Issue (8): 1316-1323.DOI: 10.3973/j.issn.2096-4498.2018.08.008

• 研究与探索 • 上一篇    下一篇

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

于丽1, 2, 蔡闽金1, 2, *   

  1. (1. 西南交通大学土木工程学院, 四川 成都 610031;2. 西南交通大学交通隧道工程教育部重点实验室, 四川 成都 610031)
  • 收稿日期:2018-05-02 修回日期:2018-06-29 出版日期:2018-08-20 发布日期:2018-09-04
  • 作者简介:于丽(1978—),女,辽宁大连人,2009年毕业于西南交通大学,桥梁与隧道工程专业,博士,副教授,主要从事隧道及地下工程教研工作。 Email: yuli_1026@home.swjtu.edu.cn。 *通信作者: 蔡闽金, Email: 573107559@qq.com。
  • 基金资助:

    中国铁路总公司科技研究开发计划课题(2017G007-F, 2017G007-H)

Study of Mechanical Properties of Interaction between Surrounding Rock and Supporting Structure of ZhengzhouWanzhou Highspeed Railway Tunnel Constructed by Fullsection Method with Largescale Machinery

YU Li1, 2, CAI Minjin1, 2, *   

  1. (1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 2. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China)
  • Received:2018-05-02 Revised:2018-06-29 Online:2018-08-20 Published:2018-09-04

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。

关键词: 郑万高铁隧道, 大型机械化配套全断面法, 台阶法, 围岩-支护结构, 现场监测, 数值模拟

Abstract:

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.

Key words: ZhengzhouWanzhou highspeed railway tunnel, fullsection method with largecale machinery, bench method, surrounding rock and supporting structure, field monitoring, numerical simulation

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