预应力锚索支护技术在高地应力大跨径隧道挑顶施工中的应用——以渭武高速公路木寨岭隧道为例

于家武; 龙文华; 郭新新; 郭振枝

doi:10.3973/j.issn.2096-4498.2021.08.016

隧道建设 >

2021 , Vol. 41 >Issue 8: 1392

DOI: https://doi.org/10.3973/j.issn.2096-4498.2021.08.016

施工技术

预应力锚索支护技术在高地应力大跨径隧道挑顶施工中的应用——以渭武高速公路木寨岭隧道为例

于家武 ,
龙文华 ,
郭新新 ,
郭振枝

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(1．中铁隧道集团二处有限公司，河北三河 065201； 2. 西南交通大学交通隧道工程教育部重点实验室，四川成都 610031)

于家武(1982—)，男，吉林农安人，2004年毕业于合肥工业大学，土木工程专业，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： 104033445@qq.com。*通信作者: 郭新新， E-mail: zj_gxinxin@163.com。

网络出版日期: 2021-09-06

基金资助

中铁隧道集团二处有限公司科技研发计划（2020-05）；甘肃省科技计划资助（19ZD2GA005）

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Application of Prestressed Anchor Cable Supporting Technology in Roof Ripping Construction of Long-Span Tunnel with High Geostress: a Case study of Muzhailing Tunnel of Weiyuan-Wudu Expressway

YU Jiawu ,
LONG Wenhua ,
GUO Xinxin ,
GUO Zhenzhi

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(1. The 2nd Engineering Co.[KG-*3], Ltd. of China Railway Tunnel Group, Sanhe 065201, Hebei, China；2. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China)

Online published: 2021-09-06

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摘要

为解决高地应力软岩环境下斜井进正洞交叉口挑顶施工难题，以渭武高速公路木寨岭隧道2#斜井进正洞为工程背景，对原挑顶设计方案进行优化，基于高强预应力支护理论，提出以小孔径预应力锚索支护技术为核心的挑顶方案，取消原设计方案中的托梁和支撑梁，实现“以索代撑”。对小孔径预应力锚索支护结构和施工工艺、挑顶支护设计和实施方案进行研究，并采用该方案对木寨岭隧道2#斜井进行挑顶施工，围岩变形监测结果表明该方案安全有效。

关键词： 高地应力软岩隧道; 挑顶施工; 大跨径; 预应力锚索; 以索代撑; 支护结构

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于家武 , 龙文华 , 郭新新 , 郭振枝 .

预应力锚索支护技术在高地应力大跨径隧道挑顶施工中的应用——以渭武高速公路木寨岭隧道为例

[J]. 隧道建设, 2021 , 41(8) : 1392 . DOI: 10.3973/j.issn.2096-4498.2021.08.016

Abstract

The original roof ripping design for the connection between shaft No. 2 and the main tunnel of Muzhailing tunnel on the WeiyuanWudu expressway is improved to allow roof ripping construction in soft rock with significant geostress. A new roof ripping design with a smalldiameter prestressed anchor cable as the key technology is proposed based on the highstrength prestressed support theory, in which the joist and the support beam are cancelled to achieve the idea of "support replaced by cable". The structure and technology of the smalldiameter prestressed anchor cable, as well as the design and implementation scheme of roof ripping and supporting, are studied and applied to the roof ripping construction for the connection section between inclined shaft No. 2 and main tunnel of Muzhailing tunnel. The monitoring results of the surrounding rock deformation show that the proposed method is safe and effective.

Key words： high geostress soft rock tunnel; roof ripping construction; long span; prestressed anchor cable; support replaced by cable; supporting structure

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