我国西南部山区隧道施工期支护结构力学行为特征案例分析

doi:10.3973/j.issn.2096-4498.2020.06.004

中国科学引文数据库（CSCD）来源期刊
中文核心期刊中文科技核心期刊
Scopus RCCSE中国核心学术期刊
美国EBSCO数据库俄罗斯《文摘杂志》
《日本科学技术振兴机构数据库（中国）》

隧道建设（中英文） ›› 2020, Vol. 40 ›› Issue (6): 800-812.DOI: 10.3973/j.issn.2096-4498.2020.06.004

我国西南部山区隧道施工期支护结构力学行为特征案例分析

陈子全¹，寇昊¹，杨文波^{1, *}，何川¹，李永林²

（1. 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；2. 四川藏区高速公路有限责任公司，四川成都 610000）

出版日期:2020-06-20 发布日期:2020-06-29
作者简介:陈子全（1989—），男，重庆人，2019年毕业于西南交通大学，桥梁与隧道工程专业，博士，助理研究员，主要从事隧道与地下工程方面的研究工作。E-mail： chen_ziquan@163.com。*通信作者：杨文波， E-mail： yangwenbo1179@hotmail.com。
基金资助:
国家重点研发计划资助项目(2016YFC0802210)；高铁联合基金资助项目(U1734205)

Cases Analysis of Mechanical Behavior Characteristics of Tunnel Supporting Structure in Mountainous Areas in Southwest China

CHEN Ziquan¹, KOU Hao¹, YANG Wenbo^{1， *}, HE Chuan¹, LI Yonglin²

(1. Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 2. Sichuan Tibetan Area Expressway Co., Ltd., Chengdu 610000, Sichuan, China)

Online:2020-06-20 Published:2020-06-29

摘要/Abstract

摘要： 为研究我国西南部山区隧道施工期支护结构所面临的重大问题，将雅安—康定、汶川—马尔康高速公路的典型隧道作为案例，归纳总结施工期存在的高地应力、软弱围岩、断层破碎带、次生地质灾害等潜在危险源，通过现场实测数据深入分析不同危险源环境下支护结构体系的力学行为特征。研究结果表明： 1）当隧道穿越软弱围岩时，围岩强度低、自承载能力差，接触压力、钢拱架应力均显著高于普通围岩隧道，二次衬砌分摊荷载比例显著上升； 2）当隧道穿越断层破碎带时，支护结构受力需要较长时间才能稳定下来，其力学行为呈现出3阶段演化规律，前期快速降低、中期缓慢降低、后期基本稳定； 3）当隧道洞口穿越松散堆积体时，坡体稳定性易受到扰动，其支护结构力学行为具有显著的偏压特性，围岩压力主要集中在深埋侧； 4）高地应力与围岩强度联合控制着围岩稳定性与支护结构体系的力学行为，高地应力硬岩隧道也具有一定的流变时间效应，但由于硬质围岩的强度较大、稳定性较好，支护结构受力相对较小，安全储备较高； 5）高地应力软岩隧道的围岩压力与结构受力显著升高，其支护结构力学行为在施工期便呈现出明显的流变特性，开挖约200 d后，仍然保持着缓慢增长。

关键词: 西南部山区, 隧道工程, 施工期, 围岩变形, 支护结构体系, 力学行为

Abstract: Serious potential risks, such as high geostress, weak surrounding rock, fault and fracture zone, secondary geological disasters, etc., are existing in the tunnel supporting structure in mountainous areas in southwest China during construction phase. As a result, cases analysis are carried out on Ya′anKangding Highspeed Tunnel and WenchuanMa′erkang Highspeed Tunnel so as to analyze the mechanical behaviour characteristics of tunnel supporting structure under different potential risks based on site monitoring data. The analytical results show that: (1) The contact pressure and steel arch stress of tunnel in weak surrounding rock with low strength and selfbearing capacity are much higher than those of tunnel in common surrounding rock, and the loadsharing ratio of secondary lining increases significantly. (2) When the tunnel passes through fault and fracture zone, the stabilizing time for supporting structure stress is quite long, and the mechanical behavior of the supporting structure presents threestage evolution law, i.e. falling quickly in the early stage, slowly decline in the middle stage, and becoming stable in the final stage. (3) As for portal section of tunnel passes through loose deposits, the stability of slope is easily disturbed, the mechanical behavior of the supporting 〖HJ1.5mm〗structure has significant asymmetric characteristics, and the surrounding rock pressure mainly concentrates on the deepburied side. (4) The geostress and rock properties jointly control the stability of surrounding rock and the mechanical behavior of supporting structure; the high geo stress hard rock tunnel also has certain rheological time effect, but due to the greater strength and stability of the hard surrounding rock, the supporting structure is relatively less stressed and the safety reserve is higher. (5) The surrounding rock pressure and structural force of soft rock tunnel with high geostress increase significantly, and the mechanical behavior of the supporting structure shows remarkable rheological characteristics during the construction period, even after about 200 days of excavation, it still growing slowly.

Key words: southwest mountainous area, tunnel engineering; construction period, surrounding rock deformation, supporting structure; mechanical behavior

中图分类号:

U 45

陈子全, 寇昊, 杨文波, 何川, 李永林. 我国西南部山区隧道施工期支护结构力学行为特征案例分析[J]. 隧道建设, 2020, 40(6): 800-812.

CHEN Ziquan, KOU Hao, YANG Wenbo, HE Chuan, LI Yonglin. Cases Analysis of Mechanical Behavior Characteristics of Tunnel Supporting Structure in Mountainous Areas in Southwest China[J]. Tunnel Construction, 2020, 40(6): 800-812.

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我国西南部山区隧道施工期支护结构力学行为特征案例分析

Cases Analysis of Mechanical Behavior Characteristics of Tunnel Supporting Structure in Mountainous Areas in Southwest China

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