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隧道建设(中英文) ›› 2022, Vol. 42 ›› Issue (4): 720-729.DOI: 10.3973/j.issn.2096-4498.2022.04.022

• 施工技术 • 上一篇    下一篇

新乌鞘岭隧道软岩大变形悬臂掘进机施工控制技术研究

陈善民1, 王全胜2, *, 辛维克3, 贾大鹏3   

  1. 1. 中铁三局集团有限公司, 山西太原〓030001; 2. 中铁工程装备集团隧道设备制造有限公司, 河南新乡〓453000; 3. 中国国家铁路集团有限公司工程管理中心, 北京〓100844
  • 出版日期:2022-04-20 发布日期:2022-05-01
  • 作者简介:陈善民(1979—),男,甘肃静宁人,2018年毕业于北京交通大学,项目管理专业,硕士,高级工程师,从事隧道与地下工程技术研究工作。E-mail: 33656056@qq.com。 *通信作者: 王全胜, E-mail: wqsky2s@163.com。

Control Technology of Soft Rock Large Deformation in New Wushaoling Tunnel Induced by Cantilever Excavator Construction

CHEN Shanmin1, WANG Quansheng2, *, XIN Weike3, JIA Dapeng3   

  1. (1. China Railway No.3 Engineering Group Co., Ltd., Taiyuan 030001, Shanxi, China; 2. China Railway Engineering Equipment Group Tunnel Equipment Manufacturing Co., Ltd., Xinxiang 453000, Henan, China; 3. Engineering Management Center of CHINA RAILWAY, Beijing 100844, China)
  • Online:2022-04-20 Published:2022-05-01

摘要: 为解决新乌鞘岭隧道8号、9号、10号斜井工区正洞在千枚岩、板岩等软弱破碎岩体前期施工中出现的掌子面频繁溜塌、初期支护开裂、变形扭曲等问题,在对地质预报、监控量测和围岩松动圈等数据分析以及三台阶钻爆法施工支护存在的问题研究的基础上,采用现场试验的方法,研究玻璃纤维锚杆超前加固、超前大管棚支护、悬臂掘进机预留核心土两台阶机械法开挖工法、合理预留变形量以及增强初期支护的锁脚锚固、桁架结构加强初期支护纵向连接、径向注浆加固围岩等措施。经现场应用表明: 1)对于高地应力软弱围岩隧道,采用预留核心土两台阶大断面悬臂掘进机铣挖法施工技术是可行的,结合超前加固、支护结构补强等措施后,支护结构累计变形较前期减小一半以上,支护结构变形可控。2)采用悬臂掘进机开挖,隧道平均线性超挖量可控制在15 cm以内,相比钻爆法喷射混凝土平均超挖率由120%减小至60%,工序循环时间减少3 h左右,月施工进度由25~35 m提升至50~60 m3)高地应力软岩大变形控制应在合理工法、合适设备、合理预留变形量和具有一定抵抗变形能力的支护结构之间找到平衡点。

关键词: 铁路隧道, 软岩大变形, 变形控制, 铣挖法, 悬臂掘进机

Abstract:  During the main tunnel construction at the inclined shaft site Nos. 8, 9, and 10 of the New Wushaoling tunnel in phyllite and slate soft and broken rocks, many challenges were faced, such as the frequent collapse of the tunnel face, primary support cracking, and rock mass deformation and distortion. Accordingly, the data analysis of geological prediction, monitoring measurement, surrounding rock loose circle, construction stage, and support problems in drillandblast construction of the threebench method is studied. The field test method is used to study advance reinforcement using glass fiber anchor rods, advance large pipe shed support, twobench mechanical excavation method for reserving core soil by cantilever excavator, reasonably reserved deformation, foot locking anchorage enhancing the primary support, truss structure strengthening the primary support longitudinal connection, radial grouting, and surrounding rock consolidation. The fieldrelevant results show the following. (1) The reserved core soil twobench largesection mechanical construction using a cantilever excavator is feasible in soft rock tunnels with high ground stress. After using the advance reinforcement and support structure methods, the stabilizing period of support convergence is reduced by over a month.  The support structures accumulative deformation is reduced by approximately half compared to the early phase, showing a controllable deformation trend. (2)  The average linear overexcavation using a cantilever excavator can be controlled within 15 cm, reducing the average overexcavation by approximately half of that by drillandblast methods (from 120% to 60%), reducing the construction cycling time by 3 h, and improving the construction efficiency from 25~35 m per month to 50~60 m per month. (3) Large deformation control of soft rock with high ground stress should balance reasonable construction methods, equipment, reserved deformation, and support structures with specific deformation resistance.

Key words: railway tunnel, soft rock large deformation, deformation control, milling method, cantilever excavator