衬砌背后空洞对连拱隧道结构受力和破坏的影响研究

张旭; 黄诗闵; 许有俊; 满忠昂

doi:10.3973/j.issn.2096-4498.2022.01.012

隧道建设 >

2022 , Vol. 42 >Issue 1: 90 - 102

DOI: https://doi.org/10.3973/j.issn.2096-4498.2022.01.012

研究与探索

衬砌背后空洞对连拱隧道结构受力和破坏的影响研究

张旭 ,
黄诗闵 ,
许有俊 ,
满忠昂

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（1. 内蒙古科技大学土木工程学院，内蒙古包头 014010；2. 内蒙古科技大学矿山安全与地下工程院士工作站，内蒙古包头 014010；3. 内蒙古科技大学内蒙古自治区高校城市地下工程技术研究中心，内蒙古包头 014010）

张旭（1989—），男，辽宁大洼人，2019年毕业于北京交通大学，土木工程专业，博士，讲师，现从事隧道结构病害及安全控制方面的研究工作。E-mail： zxbjtu@yeah.net。 *通信作者：许有俊， E-mail： xyoujun@163.com。

网络出版日期: 2022-01-28

基金资助

国家自然科学基金项目（52168059）；内蒙古自治区自然科学基金项目（2020BS05031）；城市地下工程教育部重点实验室开放研究基金项目（TUE2019-02）

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Impact of Voids Behind Lining on Stress and Failure of Double-Arch Tunnels

ZHANG Xu ,
HUANG Shimin ,
XU Youjun ,
MAN Zhongang

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(1.School of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China;2.Academician Workstation of Mine Safety and Underground Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China;3.Engineering Research Center of Urban Underground Engineering at Universities of Inner Mongolia Autonomous Region,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China)

Online published: 2022-01-28

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摘要

为研究衬砌背后空洞而诱发的连拱隧道结构破坏机制及解决维修整治难题，以衬砌背后存在空洞时的连拱隧道为研究对象，通过相似模型试验和有限元数值模拟，研究空洞位置及尺寸变化时连拱隧道围岩压力分布、结构安全状态及破坏演化规律。结果表明： 1）因为衬砌背后空洞的存在，连拱隧道内侧拱肩的土压力大于外侧拱肩，雁形区承受较大的围岩荷载； 2）空洞位置发生变化时，空洞同侧隧道拱顶、拱腰裂缝的形态及传播规律差距显著，空洞对侧隧道以及连拱隧道底部的影响相对较小； 3）当空洞位于中墙顶部时，拱顶安全系数比空洞位于其他位置时更小，而裂缝尺寸更大，且拱顶裂缝最早出现； 4）随左洞拱顶空洞尺寸的增加，中墙与右洞拱部交接处越容易产生裂缝，连拱隧道破坏程度越严重，空洞角度比空洞深度对连拱隧道结构破坏影响更明显，空洞角度的增加使得空洞区域内、空洞左侧边缘及左拱脚的裂缝更早出现。研究揭示了空洞位置及尺寸变化时的连拱隧道裂缝分布规律及扩展过程，建议对连拱隧道衬砌背后形成大尺寸的空洞及时进行注浆充填。

关键词： 连拱隧道; 结构破坏; 模型试验; 衬砌背后空洞

本文引用格式

张旭 , 黄诗闵 , 许有俊 , 满忠昂 . 衬砌背后空洞对连拱隧道结构受力和破坏的影响研究[J]. 隧道建设, 2022 , 42(1) : 90 -102 . DOI: 10.3973/j.issn.2096-4498.2022.01.012

Abstract

The failure mechanism of double-arch tunnels due to voids behind lining and the relevant maintenance technology remains scarce. As a result, a similar model test and finite element simulation are performed to investigate earth pressure distribution, structural safety, and failure laws as the location and size of a void behind lining change. The results show that: (1) Due to a void behind the lining, the earth pressure acting at the spandrel inside is larger than outside, and the largest value occurred at the en echelon area. (2) A change in the void location causes significant differences in the distribution pattern and propagation law of cracks at the crown and haunch of the tunnel on the same side of a void; however, it has little effect on the bottom of the double-arch tunnel. (3) When there is a void behind the central wall, the crown's minimum safety factor appears, and the crack with the greatest area appears earlier than in the other cases. (4) As the size of the void at the crown increases, the lining at the arch connected with the central wall is prone to cracking, resulting in serious failure. The angle of the void has a greater influence on lining failure than the height of the void. These cracks appear earlier as the void angle increases, on both sides of the void and at the left arch feet. The findings revealed the distribution law and process of crack propagation in double-arch tunnels caused by changes in the location and size of voids behind the lining. The large voids detected behind the linging of double-arch tunnels should be grouted timely.

Key words： double-arch tunnel; structural failure; model test; void behind lining

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