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隧道建设(中英文) ›› 2022, Vol. 42 ›› Issue (S2): 363-371.DOI: 10.3973/j.issn.2096-4498.2022.S2.045

• 施工技术 • 上一篇    下一篇

高原铁路某隧道松散堆积体中悬臂掘进机法的应用

李志军1 2, 刘广志2, 周毅2, 刘维正3 4, 于京波2 *, 陈桥2   

  1. 1. 西南交通大学土木工程学院, 四川 成都 610031 2. 中铁隧道局集团有限公司, 广东 广州 511458; 3. 中南大学土木工程学院, 湖南 长沙 410075 4. 中南大学 高速铁路建造技术国家工程研究中心, 湖南 长沙 410075
  • 出版日期:2022-12-30 发布日期:2023-03-24
  • 作者简介:李志军(1975—),男,四川洪雅人,西南交通大学交通运输工程专业在读博士,教授级高级工程师,现从事隧道与地下工程设计、施工、科研及管理工作。Email: 1270076106@qq.com。*通信作者: 于京波, Email: 252074706@qq.com。

Application of Cantilever Roadheader Method in Loose Accumulation of a Tunnel on Plateau Railway

LI Zhijun1, 2, LIU Guangzhi2, ZHOU Yi2, LIU Weizheng3, 4, YU Jingbo2, *, CHEN Qiao2   

  1. (1.School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan,China;2.China Railway Tunnel Group Co., Ltd.,Guangzhou 511458,Guangdong,China;3.School of Civil Engineering,Central South University,Changsha 410075,Hunan,China;4.National Engineering Research Center of High Speed Railway Construction Technology,Central South University,Changsha 410075,Hunan,China)
  • Online:2022-12-30 Published:2023-03-24

摘要: 为解决松散堆积体隧道支护变形大、爆破开挖风险高的问题,依托高原铁路某隧道进口段,采用悬臂掘进机两台阶法对松散堆积体软弱围岩进行开挖施工。结合左右线各约60 m长的开挖试验段,总结悬臂掘进机的开挖方案、施工进度、质量控制、安全环保等施工能力,并将其与局部爆破、挖机+破碎锤方法在变形控制和技术经济指标方面进行对比,分析悬臂掘进机的适用性。结果表明: 1)采用悬臂掘进机施工的隧道拱顶累计沉降量为20  mm、周边收敛为15 mm、线性超挖值为10~15 cm,均明显低于爆破和挖机带破碎锤方法的结果; 2)用悬臂掘进机施工每循环进尺1.2 m作业可节约2.5 h,Ⅵ级围岩进度可达到30 m/月,且洞内噪声较小、颗粒物质量浓度较低; 3)悬臂掘进机在洞口段堆积体以及Ⅴ、Ⅵ级和Ⅳ级偏软围岩具有较好的适应性,且适用于台阶法高度4.0~7.5 m、宽度5.58.5 m的断面开挖。

关键词: 悬臂掘进机, 高原铁路隧道, 洞口, 松散堆积体, 掘进机适用性

Abstract:

To solve the problem of large deformation of tunnel support and high risk of blasting excavation in loose accumulation, based on the entrance section of a tunnel on plateau railway, the twobench method using cantilever roadheader is adopted to excavate the weak surrounding rock of loose accumulation. Based on an excavation test section of about 60 m long on the left and right lines, the excavation plan, construction progress, quality control, safety and environmental protection, and other construction capabilities of cantilever roadheader are summarized, and the applicability of cantilever roadheader is analyzed by comparing with local blasting, excavator and breaker methods in deformation control and technical and economic indicators. The results show that: (1The accumulative settlement using the cantilever tunnel method is 20 mm, the peripheral convergence is 15 mm, and the linear overexcavation value is ranged from 10 to 15 cm, which are significantly lower than the results of blasting and excavator with breaker. 2)2.5 hours can be saved for each 1.2 m footage of circulation, and the progress of Grade surrounding rock can reach 30 m/monththe noise in the cave is low, and the content of particulate matter is also low. 3The cantilever roadheader has good adaptability in the accumulation body at the portal section and soft surrounding rocks of Grade , , and , and is most suitable for the section excavation construction with the height range of 4.0 to 7.5 m and width range of 5.5 to 8.5 m by bench method.

Key words: cantilever roadheader, plateau railway tunnel, tunnel portal, loose accumulation, application of cantilever roadheader