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隧道建设(中英文) ›› 2018, Vol. 38 ›› Issue (S2): 161-168.DOI: 10.3973/j.issn.2096-4498.2018.S2.022

• 研究与探索 • 上一篇    下一篇

基于强度折减法和现场监控量测的大断面隧道开挖工法适用性研究

杨学奇1, 2 , 杨涅1, 2 , 姚萌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:2018-04-18 修回日期:2018-11-19 出版日期:2018-12-30 发布日期:2019-01-30
  • 作者简介:杨学奇(1991—),男,云南大理人,西南交通大学桥梁与隧道工程专业在读硕士,研究方向为隧道与地下工程。Email:2604502287@qq.com。
  • 基金资助:

    中国铁路总公司科技研究开发计划课题(2017G007-H)

Study of Applicability of Large Crosssection Tunneling Method Based on  Strength Reduction Method and Onsite Monitoring Measurement

YANG Xueqi1, 2, YANG Nie1, 2, YAO Meng1, 2   

  1. (1.School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China;  2. Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China)
  • Received:2018-04-18 Revised:2018-11-19 Online:2018-12-30 Published:2019-01-30

摘要:

为明确微台阶Ⅰ法在Ⅳ级围岩地层中进行快速掘进施工的适用性,依托郑万高铁保康隧道工程,采用基于强度折减法原理的数值分析方法,以位移突变和计算不收敛等为主要判据指标,对微台阶Ⅰ法施工过程中的围岩稳定性进行分析,并通过现场监控量测方法来分析隧道采用微台阶Ⅰ法施工时结构的安全性。结果表明: 1)隧道拱顶和拱肩位置的竖向位移对折减系数较为敏感,而拱脚和边墙部位的水平收敛对折减系数较为敏感; 2)采用传统的三台阶法和大机配套施工的微台阶Ⅰ法所得到的折减安全系数较为接近,微台阶Ⅰ法对施工围岩稳定性影响较小,可以保证隧道安全快速掘进,在Ⅳ级围岩地层中具有良好的适用性。

关键词: 郑万高铁, 大断面隧道, 微台阶Ⅰ法, 强度折减法, 现场监控量测

Abstract:

In order to study the applicability of a large crosssection tunneling method, microbench method Ⅰ, for rapid excavation construction in Grade Ⅳ surrounding rock to, the stability of surrounding rock during the construction of microstep I method is analyzed based on numerical analysis of strength reduction method and displacement mutation and calculation nonconvergence as main indices; and the safety of the actual tunnel structure is determined by analyzing the field monitoring data. The analytical results show that: (1) The vertical displacement of the crown top and spandrel is sensitive to the strength reduction factor, while the horizontal convergence of arch feet and sidewall is sensitive to the strength reduction factor. (2) The strength reduction safety factor obtained by using the traditional threebench method and the that by microbench method Ⅰ with large machinery is almost the same; and the microbench Ⅰ method has little influence on the stability of the surrounding rock, which can ensure the safe and rapid tunneling and has good feasibility in Grade Ⅳ surrounding rock.

Key words: ZhengzhouWanzhou Highspeed Railway, large crosssection tunnel, microbench method I, strength reduction method, field monitoring

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