川藏铁路邻近一级水源地高悬洞口安全进洞施工技术

王金刚, 于京波, 李志军, 刘维正, 陈桥, 周广杰

doi:10.3973/j.issn.2096-4498.2021.S2.075

隧道建设 >

2021 , Vol. 41 >Issue S2: 588 - 596

DOI: https://doi.org/10.3973/j.issn.2096-4498.2021.S2.075

施工技术

川藏铁路邻近一级水源地高悬洞口安全进洞施工技术

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（1. 中铁隧道局集团有限公司，广东广州 511458； 2. 西南交通大学土木工程学院，四川成都 610031； 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工程实验室，湖南长沙 410075）

王金刚（1989—），男，甘肃天水人，2011年毕业于兰州交通大学，隧道与地下工程专业，本科，工程师，现从事隧道工程施工技术工作，E-mail： 1345203321@qq.com。*通信作者：于京波，E-mail: 252074706@qq.com。

网络出版日期: 2022-03-18

基金资助

中铁隧道局集团有限公司科技研究开发计划（隧研合2021-24，隧研合2021-25）

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Construction Technology for Safe Excavation of HighHanging Portal of SichuanTibet Railway Near Primary Class I Water Source

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(1. China Railway Tunnel Group Co., Ltd., Guangzhou 511458, Guangdong, China； 2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 3. School of Civil Engineering, Central South University, Changsha 410075, Hunan, China; 4. National Engineering Laboratory of High Speed Railway Construction Technology, Central South University, Changsha 410075, Hunan, China)

Online published: 2022-03-18

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摘要

为解决川藏铁路隆巴沟斜井进洞施工面临洞口高悬、场地狭窄、围岩破碎、生态脆弱、高寒缺氧等难题，保证斜井进洞施工的绿色安全及高效。首先，通过洞口场地合理规划，采用先支设浆砌片石+重力式挡土墙，再回填墙背，以保护生态水源同时克服施工作业场地狭小问题。然后，提出先施作洞顶主被动防护网、边仰坡挂网喷护，打设大管棚，施作导向墙使洞口前置的方法，并在洞口坡脚施作仰斜式混凝土挡墙保证洞口边仰坡的稳定性，形成了“零刷坡进洞、先支护后开洞”技术。最后，采用洞内微台阶开挖法，实现初期支护结构快速封闭成环，有效控制围岩变形。此外，结合洞口设置暖棚等系列保暖防冻措施，保障支护结构混凝土的施工质量。实践证明：通过建立上述隧道进洞综合施工体系，可解决高原地区高悬洞口隧道进洞施工难题。

关键词： 川藏铁路隧道; 高海拔斜井; 高悬洞口; 零刷坡; 安全进洞; 综合施工

本文引用格式

王金刚, 于京波, 李志军, 刘维正, 陈桥, 周广杰 . 川藏铁路邻近一级水源地高悬洞口安全进洞施工技术[J]. 隧道建设, 2021 , 41(S2) : 588 -596 . DOI: 10.3973/j.issn.2096-4498.2021.S2.075

Abstract

The construction of Longbagou inclined shaft in SichuanTibet railway faces the problems of highhanging portal, narrow site, broken surrounding rock, fragile ecology, alpine cold and hypoxia. In order to solve the above problems and ensure green, safe, and efficient construction of the project, some measures have been adopted during construction. Firstly, reasonable planning of the cave site, construction with slurry stone and gravity retaining wall, backfilling wall back and other measures are used, which not only protect the ecological water source but also overcome the problem of narrow construction work site. Then, the active and passive protection network is applied on the roof of the cave, pipe roof and the guide wall to move the cave entrance ahead, and the elevated concrete retaining wall is constructed at the foot of the cave entrance slope. The above measures are adopted to ensure the stability of the elevation slope of the cave entrance, forming the technology of "zero brush slope (without slope cutting) into the cave, support first and then open the cave." Finally, the microbench excavation method in the cave achieves rapid closure of the primary support structure into a ring, and effectively controls the deformation of the surrounding rock. At the same time, the warming and antifreezing measures such as the warming shed are adopted to, guarantee the construction quality of the concrete of support structure. The above tunnel construction system solves the problem of highhanging tunnel entry construction in plateau area and provides reference for the subsequent construction of similar projects.

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