隧道装配式临时支撑结构力学特性研究
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兰州理工大学 土木工程学院

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U455.4

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国家自然基金资助项目(51768041)


Study on Mechanical Characteristics of Tunnel Assembly Temporary Support Structure
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School of Civil Engineering,Lanzhou University of Technology

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    摘要:

    针对隧道临时支撑施工中的不足,提出了临时支撑装配化研究,并从临时支撑形状、装配化结构、受力变形等方面对该新型结构展开研究。以邵家塘隧道为背景,统计现场监测数据,并利用有限元软件将其与传统临时支撑结构进行对比分析可得:(1)隧道后行洞开挖时会对先行洞的变形造成不利影响。(2)竖直临时支撑对隧道左、右拱腰、地表沉降以及总收敛变形的控制较好,与传统弧形相比,分别减小了16%、20% 、55%和14%,且竖直临时支撑能够更快恢复稳定,可缩短拆撑距。(3)采用竖直临时支撑,隧道初支受力相比弧形支撑更小、更安全,最竖向和横向最大应力分别减小了58%、73%。(4)采用ABAQUS软件对临时支撑局部结构的力学特性进行了模拟,结果表明,装配式竖直和传统临时支撑结构的受力与变形均能满足规范要求。但装配式临时支撑结构在施工效率和经济效益方面更有优势,选用装配式临时支撑更合适。

    Abstract:

    In response to the shortcomings in the construction of temporary support for tunnels, a study on the assembly of temporary support was proposed, and the new structure was studied from the aspects of temporary support shape, assembly structure, and stress deformation. Taking the Shaojiatang Tunnel as the background, on-site monitoring data was collected and compared with traditional temporary support structures using finite element software. It can be concluded that (1) excavation of the tunnel"s rear tunnel will have adverse effects on the deformation of the previous tunnel. (2) Vertical temporary support has better control over the left and right arch waists, surface settlement, and total convergence deformation of the tunnel. Compared with traditional curved structures, it has decreased by 16%, 20%, 55%, and 14%, respectively. Moreover, vertical temporary support can restore stability faster and shorten the dismantling distance. (3) By using vertical temporary support, the initial support force of the tunnel is smaller and safer compared to the curved support, and the maximum vertical and lateral stresses are reduced by 58% and 73%, respectively. (4) The mechanical characteristics of temporary support local structures were simulated using ABAQUS software, and the results showed that the forces and deformations of both prefabricated vertical and traditional temporary support structures can meet the requirements of the specifications. However, prefabricated temporary support structures have more advantages in construction efficiency and economic benefits, and choosing prefabricated temporary support is more suitable.

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乔 雄,倪伟淋,扈士静,等. 隧道装配式临时支撑结构力学特性研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-12-09
  • 最后修改日期:2024-06-30
  • 录用日期:2024-07-09
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