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现代隧道技术 2022, Vol. 59 Issue (5) :91-98    DOI:
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局部超挖汇水下隧道支护结构受力特性
(1. 湖南科技大学,湘潭 411201;2.中建铁路投资建设集团有限公司,北京 100162)
Influence of Catchment Caused by Local Overbreak on the Mechanical Characteristics of Tunnel Support Structure
(1.Hunan University of Science and Technology, Xiangtan 411201; 2. China State Construction Railway Investment & Engineering Group Co., Ltd., Beijing 102628)
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摘要 隧道局部超挖汇水增加了支护结构的承载负担,容易造成支护结构开裂、渗漏水,从而影响隧道施工安全。基于此,为了研究汇水压力对隧道支护结构变形特征、应力特性、内力变化的影响规律,以富水地段隧道开挖为背景,通过数值仿真研究5种外水压力工况下,同一断面内不同位置的隧道支护的应力及位移。结果表明:超挖部位汇水后,支护结构受沿隧道轮廓环向分布的外水压力会产生沿外水压力方向的位移,主要影响范围在超挖汇水部位。在拱顶和拱肩超挖时汇水部位产生应力集中现象;边墙超挖时最大主应力逐渐减小,最小主应力逐渐增大。外水压力只对汇水部位的内力产生影响,外水压力的增加会使轴力逐渐变大,弯矩逐渐减小。此外,拱顶超挖汇水时,拱顶弯矩逐渐由负弯矩变为正弯矩。研究成果可为富水段隧道围岩变形的控制以及支护结构的补强措施提供参考。
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安永林 1 郭晋东 1 周 进 1 胡 伟 1 董晨阳 2 向 晖 2 戴 岭 2
关键词超挖汇水   外水压力   支护结构   受力特性     
Abstract: The catchment caused by local overbreak of the tunnel increases the bearing burden of the supporting structure, and it is easy to cause groundwater leakage and cracking of support structure, thus influencing the construction safety. Based on it, in order to study the influence of catchment pressure on the deformation characteristics, stress characteristics, internal force changes and safety of tunnel support, the numerical model is established based on the tunnel excavation in the water-bearing section. The initial support of the tunnel is subjected to circumferential pressure to simulate the external water pressure. Five external water pressure conditions are set for comparative study, and the stress and displacement results of tunnel support at different positions in the same section are analyzed respectively. The results show that after the catchement of overbreak area occurs, the tunnel support structure will be displaced in the direction of the external water pressure due to the external water pressure distributed along the tunnel contour, and the main influence range is in the catchment area of the tunnel. Stress concentration occurs in the catchment area when catchment caused by overbreak occurs on the crown and shoulder of the tunnel.When the side wall is overbreakd, the maximum principal stress decreases and the minimum principal stress increases gradually. The external water pressure only affects the internal force of the catchment area. The increase of the external water pressure will increase the axial force and decrease the bending moment. In addition, when the catchment occurs at the crown, the crown bending moment gradually changes from negative bending moment to positive bending moment. The research results can provide technical reference for the deformation control of tunnel surrounding rock in water-bearing region and the reinforcement measures of supporting structure.
KeywordsCatchment caused by overbreak,   External hydraulic pressure,   Supporting structure,   The mechanical characteristics     
基金资助:湖南省自然科学基金资助项目(2021JJ30248);湖南省教育厅资助科研项目(20A1873)
作者简介: 安永林(1981-),男,博士,副教授,主要从事隧道及地下工程领域的科研及教学工作,E-mail: aylcsu@163.com.
引用本文:   
安永林 1 郭晋东 1 周 进 1 胡 伟 1 董晨阳 2 向 晖 2 戴 岭 2 .局部超挖汇水下隧道支护结构受力特性[J]  现代隧道技术, 2022,V59(5): 91-98
AN Yonglin1 GUO Jindong1 ZHOU Jin1 HU Wei1 DONG Chenyang2 XIANG Hui2 DAI Ling2 .Influence of Catchment Caused by Local Overbreak on the Mechanical Characteristics of Tunnel Support Structure[J]  MODERN TUNNELLING TECHNOLOGY, 2022,V59(5): 91-98
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