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隧道建设(中英文) ›› 2019, Vol. 39 ›› Issue (2): 227-239.DOI: 10.3973/j.issn.2096-4498.2019.02.007

• 研究与探索 • 上一篇    下一篇

大跨地铁隧道组合工法穿越断层时的围岩变形控制分析

唐晓杰1, 2, 石磊3, 陈佳玮1, 2, *, 彭振3, 李元海1, 2   

  1. (1. 中国矿业大学力学与土木工程学院, 江苏徐州 221116; 2. 中国矿业大学深部岩土力学与地下工程国家重点实验室, 江苏徐州 221116; 3. 中交(广州)建设有限公司, 广东广州 511458)
  • 收稿日期:2018-06-25 修回日期:2018-12-03 出版日期:2019-02-20 发布日期:2019-03-05
  • 作者简介:唐晓杰(1993—),男,江苏无锡人,中国矿业大学岩土工程专业在读硕士,主要研究方向为岩土工程数字照相量测技术与地下工程。Email: tangxiaojie_edu@163.com。*通信作者: 陈佳玮, Email: Chenjiawei_work@163.com。
  • 基金资助:

    国家重点基础研究发展计划973项目(2014CB046905)

Analysis of Surrounding Rock Deformation Control of Largespan Metro Tunnel Crossing Fault by Combined Tunneling Method

TANG Xiaojie1, 2, SHI Lei3, CHEN Jiawei1, 2, *, PENG Zhen3, LI Yuanhai1, 2   

  1. (1.School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu,  China; 2. State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining and  Technology, Xuzhou 221116, Jiangsu, China; 3. China Communications Construction Company (Guangzhou) Ltd., Guangzhou 511458, Guangdong, China)
  • Received:2018-06-25 Revised:2018-12-03 Online:2019-02-20 Published:2019-03-05

摘要:

以深圳轨道交通2号线新莲区间隧道为工程背景,针对大跨地铁隧道穿越断层的围岩变形与控制问题,采用FLAC3D数值模拟,分析双侧壁导坑工法与CD工法不同组合穿越断层的围岩变形规律与注浆控制效果。结果表明: 1)隧道穿越断层破碎带时,Ⅳ、Ⅴ级围岩交界并与断层相交的拱顶处以及Ⅴ级围岩与断层相交的拱腰处的围岩位移最大,是变形控制的关键部位; 2)双侧壁导坑法穿越断层对大跨地铁隧道的围岩变形控制较好,工程实际工法组合下围岩变形的最大影响范围为12.4 m,围岩位移控制较好,工法组合合理有效; 3)注浆加固对断层破碎带处围岩变形模式的影响与控制作用明显,注浆后围岩变形区域由未注浆的“枣核形”变为较均匀的“椭圆形”; 4)提出位移控制率均值的概念,以定量描述围岩的注浆效果,隧道穿越断层时3 m厚度注浆的围岩位移控制率均值达51%,围岩变形控制效果较优。

关键词: 大跨地铁隧道, 断层, FLAC3D, 工法组合, 注浆, 围岩变形, 监测

Abstract:

The surrounding rock deformation laws and grouting control effect of largespan XinxiuLiantang Port Tunnel on Shenzhen Rail Transit Line No. 2 are analyzed by FLAC3D numerical simulation method when adopting different combinations of doubleside drift method and CD method crossing fault. The analytical results show that: (1) The maximum displacement occurs at two key deformation control areas, i.e. the intersection of crown top between grade Ⅳ/Ⅴ surrounding rock boundary and the fault zone and the intersection of waist between grade Ⅴ surrounding rock and the fault zone, when tunnel crosses fault and fracture zone. (2) The deformation of surrounding rock is under effective control by adopting doubleside drift method when largespan metro tunnel crosses fault zone; and the maximum influencing scope of surrounding rock under actual construction method combination is 12.4 m. (3) The grouting around the fault and fracture zone has a good effect on surrounding rock deformation mode and control; and the shape of surrounding rock deformation area turned from a date pit to an uniform oval. (4) A quantitative description of the grouting control effect is proposed in surrounding rock displacement. The vertical displacement control rate of surrounding rock with 3 m grouting thickness reaches 51%, which shows a good surrounding rock deformation control effect.

Key words: largespan metro tunnel, fault, FLAC3D, construction method combination, grouting, surrounding rock deformation, monitoring

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