超大埋深软岩隧道平行导洞合理超前距离研究

谭忠盛, 张宝瑾, 马建华, 陈应武, 赵金鹏, 范晓敏, 王雪冰

doi:10.3973/j.issn.2096-4498.2024.S1.001

隧道建设 >

2024 , Vol. 44 >Issue S1: 1 - 7

DOI: https://doi.org/10.3973/j.issn.2096-4498.2024.S1.001

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超大埋深软岩隧道平行导洞合理超前距离研究

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（1. 北京交通大学城市地下工程教育部重点实验室，北京 100044； 2. 中国铁路昆明局集团有限公司滇西铁路建设指挥部，云南大理 671000）

谭忠盛（1963—），男，广西梧州人，1999年毕业于西南交通大学，桥梁与隧道工程专业，博士，教授，主要从事隧道与地下工程等领域的教学与科研工作。E-mail： zhshtan@bjtu.edu.cn。 *通信作者：张宝瑾， E-mail： 23111326@bjtu.edu.cn。

网络出版日期: 2024-09-02

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Reasonable Advance Distance of Parallel Guiding Tunnels in Super-Deep Soft Rock Tunnels

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(1. Key Laboratory for Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China; 2. Yunnan West Railway Construction Command Headquarters of China Railway Kunming Bureau Group Co., Ltd., Dali 671000, Yunnan, China)

Online published: 2024-09-02

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摘要

为解决滇藏铁路丽香线哈巴雪山隧道施工过程中产生的大变形问题，采用数值模拟、现场监测的方法，对哈巴雪山隧道不同平行导洞超前距离下隧道变形及正洞区域应力进行研究，提出平行导洞的合理超前距离。研究结果表明： 1）哈巴雪山隧道平行导洞超前正洞的距离应设定为100 m，此时平行导洞对正洞区域的应力释放效果已达90%以上。2）平行导洞的设置使正洞拱顶沉降减小6.92%，上台阶水平收敛减小14.58%，下台阶水平收敛减小10.8%。由此可知，平导超前开挖能够减小正洞支护变形，对正洞水平收敛的控制效果大于拱顶沉降。

关键词： 超大埋深; 软岩隧道; 应力释放技术; 平行导洞; 超前距离

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谭忠盛, 张宝瑾, 马建华, 陈应武, 赵金鹏, 范晓敏, 王雪冰 . 超大埋深软岩隧道平行导洞合理超前距离研究[J]. 隧道建设, 2024 , 44(S1) : 1 -7 . DOI: 10.3973/j.issn.2096-4498.2024.S1.001

Abstract

To address the large deformation encountered during the construction of the Haba Snow Mountain tunnel on the Lijiang-Shangri-La section of the Yunnan-Xizang railway, the authors employ numerical simulations and on-site monitoring methods to examine the deformation of the tunnel and the stress in the main tunnel area under different advance distances of parallel guiding tunnels. A reasonable advance distance for the parallel guiding tunnels is proposed. The research results indicate the following: (1) The advance distance of the parallel guiding tunnel should be 100 m ahead of the main tunnel, which can achieve a stress release effect of over 90% on main tunnel area by parallel guiding tunnel. (2) On-site monitoring results show that the parallel guiding tunnel reduces the settlement of the main tunnel crown by 6.92%, the horizontal convergence of the upper bench by 14.58%, and the horizontal convergence of the lower bench by 10.8%. Thus, it is evident that the advance excavation of the parallel guiding tunnel can reduce the deformation of the main tunnel support. The control effect on the horizontal convergence of the main tunnel is greater than that on the crown settlement.

Key words： super-deep depth; soft rock tunnel; stress release technology; parallel guiding tunnel; advance distance

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