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施工技术

TBM穿越不良地质施工关键技术——以高原铁路某隧道进口段为例

  • 杜闯东 ,
  • 洪开荣 ,
  • 李志军 ,
  • 杨延栋
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  • (中铁隧道局集团有限公司, 广东广州〓511457)
杜闯东(1974—),男,河南洛阳人,2013 年毕业于西南交通大学,土木工程专业,本科,教授级高级工程师,主要从事盾构/TBM 施工技术研究和管理工作。Email: dcd.321@163.com。

网络出版日期: 2022-08-04

Key Technologies of Tunnel Boring Machine Passing through Unfavorable Geology: a Case Study of Entrance Section of a Plateau Railway Tunnel

  • DU Chuangdong ,
  • HONG Kairong ,
  • LI Zhijun ,
  • YANG Yandong
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  • (China Railway Tunnel Group Co., Ltd., Guangzhou 511457, Guangdong, China)

Online published: 2022-08-04

摘要

针对高原铁路某隧道超长、深埋、高能地质可能引发的高地应力岩爆、软弱围岩(大)变形等问题,通过案例对比、经验总结和技术分析等方法全面分析该隧道TBM在防岩爆、控变形和防坍塌等方面存在的主要问题,并依据各类问题的防控机制提出相关技术思路。总体认为,充分利用TBM自身的施工特点和相关防控措施,并对TBM进行针对性设计及施工技术创新,可以克服该隧道的局部不良地质,具体包括: 1)TBM针对性设计包括合理设置刀盘扩挖长度和护盾长度,加大护盾强度和防护范围,提升超前支护和应急支护能力等; 2)高应力岩爆地层施工要坚持分级防控,主动控制与被动防护相结合; 3)在高地应力软岩地层要坚持抗放结合,注重连续快速掘进和及时支护; 4)在深埋破碎地层要坚持稳掘强护,注重超前加固、及时支护和回填注浆等,以保持循环推进。

本文引用格式

杜闯东 , 洪开荣 , 李志军 , 杨延栋 .

TBM穿越不良地质施工关键技术——以高原铁路某隧道进口段为例

[J]. 隧道建设, 2022 , 42(7) : 1274 -1288 . DOI: 10.3973/j.issn.2096-4498.2022.07.016

Abstract

 A significant length, large buried depth, and high stresses in the surrounding geological strata of a plateau railway tunnel may induce rockburst and large deformations in weak rocks in high groundstress areas. In this paper, the major challenges associated with rockburst, deformation, and collapse prevention for a tunnel boring machine(TBM) are comprehensively analyzed using comparisons with previous projects, practical construction experience, and technical analyses. Suitable countermeasures are proposed. Generally, the full understanding of the construction project characteristics, TBMtargeted design, and TBM technical innovations are the key considerations. These include the following: (1) TBMtargeted design includes a suitable cutterhead expansion and shield length, shield strength enhancement, shield protection range enlargement, and advance support and emergency support strengthening. (2) Adopting hierarchic, active, and passive prevention and control methods for rockburst in high groundstress areas. (3) Focusing stress resistance and release on areas with soft rock strata with high ground stress and providing continuous and rapid excavation and timely support. (4) Emphasizing stable excavation, advance reinforcement, timely support, and backfill grouting in deeply buried broken strata.
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