软岩隧道高强预应力锚索快速支护技术研究： 以木寨岭公路隧道为例

陈洲频; 郭新新; 于家武; 龙文华; 王睿

doi:10.3973/j.issn.2096-4498.2024.08.014

隧道建设 >

2024 , Vol. 44 >Issue 8: 1669 - 1678

DOI: https://doi.org/10.3973/j.issn.2096-4498.2024.08.014

施工技术

软岩隧道高强预应力锚索快速支护技术研究：以木寨岭公路隧道为例

陈洲频 ,
郭新新 ,
于家武 ,
龙文华 ,
王睿

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(1. 中铁隧道集团二处有限公司，河北廊坊 065000； 2. 成都理工大学地质灾害防治与地质环境保护国家重点实验室，四川成都 610059； 3. 四川师范大学工学院，四川成都 610066)

陈洲频（1968—）,男,湖北大悟人,1989年毕业于西南交通大学,隧道及地下工程专业,本科,高级工程师，现从事隧道与地下工程施工技术管理工作。E-mail: czp68@163.com。*通信作者：郭新新, E-mail: zj_gxinxin@163.com。

网络出版日期: 2024-09-13

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Rapid Support Technology for High-Strength Prestressed Anchor Cables in Soft Rock Tunnels: A Case Study of Muzhailing Highway Tunnel

CHEN Zhoupin ,
GUO Xinxin ,
YU Jiawu ,
LONG Wenhua ,
WANG Rui

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(1. The 2nd Engineering Co., Ltd. of China Railway Tunnel Group, Langfang 065000, Hebei, China; 2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 3. Engineering College, Sichuan Normal University, Chengdu 610066, Sichuan, China)

Online published: 2024-09-13

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摘要

为研究适用于软岩隧道的高强预应力锚索快速支护技术，依托木寨岭公路隧道，首先，对锚索系统施工工艺、要点等进行分析，通过现场锚索拉拔试验对其支护性能进行研究；然后，提出高强预应力锚索系统支护参数设计基本原则，并开展关键设计参数取值研究；最后，总结高强预应力锚索快速支护技术应用于木寨岭公路隧道所取得的工程实效。得到结论如下： 1）高强预应力锚索系统由“高强钢绞线+垫板+锚具+树脂锚固剂+表面协同支护构件”组成，其施工要点包括钻孔、树脂锚固、预应力张拉与监测、配件安装等； 2）预应力锚索系统具备快速高强支护能力，1.7 m锚固长度的锚索锚固力大于300 kN，10 m长锚索的施工时间小于1 h； 3）严重挤压下的锚索支护开挖数值计算表明，锚索支护具有良好的变形控制效果； 4）木寨岭公路隧道中采用高强预应力锚索快速支护技术可有效控制围岩变形，提升施工进度。

关键词： 软岩隧道; 预应力锚索; 锚固性能; 参数设计; 工程应用

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陈洲频 , 郭新新 , 于家武 , 龙文华 , 王睿 . 软岩隧道高强预应力锚索快速支护技术研究：以木寨岭公路隧道为例[J]. 隧道建设, 2024 , 44(8) : 1669 -1678 . DOI: 10.3973/j.issn.2096-4498.2024.08.014

Abstract

Effective rapid support technology using high-strength prestressed anchor cables is crucial for soft rock tunnels. A case study is conducted on the Muzailing highway tunnel, detailing the construction technology and critical aspects of the anchor cable system. The study includes an examination of cable support performance through field tensioning tests, proposes a basic design principle for support parameters, and identifies key design parameters. In summary, the use of high strength prestressed anchor cables in the Muzailing highway tunnel has yielded significant results. Some conclusions are drawn as follows: (1) The high-strength prestressed anchor cable system is composed of high-strength steel strands, base plates, anchorage, resin anchorage agents, and surface collaborative support components. Critical construction tasks include drilling, resin anchoring, prestress tensioning, monitoring, and fitting installation. (2) The prestressed anchor system provides rapid and high-strength support, with a 1.7 m-length anchor achieving a force greater than 300 kN. Installation of a 10 m anchor cable is completed within 1 h. (3) Numerical calculations of excavation with anchor cable support under severe compression show that the anchor cable system effectively controls deformation. (4) The advance support technology using high-strength prestressed anchor cables in the Muzhailing highway tunnel effectively controls the deformation of surrounding rock and accelerates construction progress.

Key words： soft rock tunnel; prestressed anchor cable; anchorage performance; parameter design; engineering application

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