顶部隐伏溶洞对隧道围岩变形特征影响分析——以齐岳山高速公路隧道为例

郭明, 吴杰, 周轮

doi:10.3973/j.issn.2096-4498.2024.S1.023

隧道建设 >

2024 , Vol. 44 >Issue S1: 211 - 223

DOI: https://doi.org/10.3973/j.issn.2096-4498.2024.S1.023

研究与探索

顶部隐伏溶洞对隧道围岩变形特征影响分析——以齐岳山高速公路隧道为例

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（1. 郑州大学水利与交通学院，河南郑州 450000; 2. 中铁工程设计咨询集团有限公司郑州设计院，河南郑州 450001； 3. 长江三峡技术经济发展有限公司，湖北宜昌 443000； 4. 湖南省交通科学研究院有限公司，湖南长沙 410015）

郭明(1988—)，男，湖北孝感人， 2014年毕业于山东大学，水利工程专业，硕士，工程师，主要从事隧道与地下工程设计工作。E-mail： 630438806@qq.com。*通信作者：吴杰， E-mail： 1475305730@qq.com。

网络出版日期: 2024-09-02

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Influence of Top Concealed Karst Cave on Deformation Characteristics of Tunnel Rock: A Case Study of Qiyueshan Expressway Tunnel

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(1. School of Water Conservancy and Transportation, Zhengzhou University，Zhengzhou 450000, Henan, China; 2. Zhengzhou Design Institute, China Railway Engineering Consultants Group Co., Ltd., Zhengzhou 450001, Henan, China; 3. Yangtze Three Gorges Technology & Economy Development Co., Ltd., Yichang 443000, Hubei, China; 4. Hunan Communications Research Institute Co., Ltd., Changsha 410015, Hunan, China)

Online published: 2024-09-02

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摘要

齐岳山高速公路岩溶隧址区强致灾性隐伏溶洞较为发育，为研究隐伏溶洞对隧道围岩位移影响的变化规律，选取围岩等级、隧道埋深2个地质因素，对溶洞大小、溶洞与隧道的距离2个形态因素开展数值试验，讨论支护对围岩位移的影响,分析顶部隐伏溶洞对隧道围岩不同方向变形的影响，系统研究不同因素对顶部溶洞作用效果的影响规律。得到如下研究结果： 1）顶部溶洞对围岩变形在垂直方向和水平方向的作用效果是相反的，在垂直方向，顶部溶洞减缓拱顶和拱底的收敛效果；在水平方向，顶部溶洞加剧拱腰的收敛效果，且对拱顶、拱底、拱腰位移变化的影响依次减小。2)随着围岩级别提高、隧道埋深增大、溶洞尺寸增大、溶洞与隧道距离减小，顶部溶洞对隧道围岩变形影响的作用效果增强；在因素设计范围内，各因素对顶部溶洞作用效果的影响差异明显。

关键词： 高速公路隧道; 隐伏溶洞; 位移监测; 数值模拟

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郭明, 吴杰, 周轮 . 顶部隐伏溶洞对隧道围岩变形特征影响分析——以齐岳山高速公路隧道为例[J]. 隧道建设, 2024 , 44(S1) : 211 -223 . DOI: 10.3973/j.issn.2096-4498.2024.S1.023

Abstract

Qiyueshan expressway tunnel site area is well-developed with strong catastrophic concealed karst caves. In order to study change laws for influence of concealed karst cave on the displacement of tunnel rock, two geological factors (tunnel depth, surrounding rock grade) and two morphological factors (karst cave size, the distance between tunnel and karst cave) are selected for numerical experiments. The influence of support on the displacement of the surrounding rock was discussed, and the influence of concealed karst caves at top on deformation of tunnel rock in different directions was analyzed. The influence law for different factors effect on top karst caves was systematically studied. The results show that: (1) The affects of top karst cave on rock deformation in vertical and horizontal directions are opposite. In vertical direction, the top karst cave slows down the convergence effect at crown and arch bottom; In the horizontal direction, the top karst cave intensifies the convergence effect at arch waist, and the influence of top karst cave on displacement of the crown, arch bottom, and arch waist decreases in turn. (2) With the increase of rock grade, tunnel depth, and size of karst cave, and the decrease of distance between karst cave and tunnel, the effect of the top karst cave on tunnel rock deformation becomes more obvious. Within the range of design factors, the influence of each factor on top karst cave is obviously different.

Key words： expressway tunnel; concealed karst cave; displacement monitoring; numerical simulation

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