预制双舱公用事业隧道接头的剪切机械响应和失效特征研究

IF 3.6 2区 工程技术 Q1 ENGINEERING, CIVIL Journal of Civil Structural Health Monitoring Pub Date : 2024-04-26 DOI:10.1007/s13349-024-00806-9
Chao Zhang, Zhengrong Zhao, Youjun Xu, Xuzhi Nie
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引用次数: 0

摘要

纵向接缝是预制水电隧道中最脆弱的部分,容易受到外力和地基沉降的破坏。目前,预制双舱水电隧道接头的剪切力学性能尚不明确,无法对水电隧道的结构或接头安全性进行评估。本文通过模型试验和数值模拟相结合的方法,研究了预制双舱水电隧道接头的剪切力学响应和破坏特征。结果表明,水电隧道接头的剪切变形可分为弹性阶段、裂缝扩展阶段和破坏阶段。在接缝剪切变形过程中,中间公用设施隧道发生中心对称破坏。大舱室的变形程度大于小舱室,而小舱室的损坏更为严重。当水电隧道承受相同荷载时,砾砂地基下的接缝错位最小,但破坏范围最大,裂缝最多。在倒角处、螺栓孔附近以及顶部和底部需要进行局部加固和保护。地层条件在弹性阶段对接缝的剪切刚度影响不大,但在裂缝扩展和破坏阶段影响很大。最后,接头损坏区域约占整个实用隧道的 15%,纵向连接件的变形区域约占其长度的 16%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Study on the shear mechanical response and failure characteristics of prefabricated double-cabin utility tunnel joints

Longitudinal joints are the most vulnerable parts of prefabricated utility tunnels, susceptible to damage from external forces and foundation settlement. Currently, the shear mechanical properties of prefabricated double-cabin utility tunnel joints are unclear, preventing the evaluation of the structural or joint safety of utility tunnels. The shear mechanical response and failure characteristics of the joints of prefabricated double-cabin utility tunnels are investigated by combining model testing with numerical simulation. The results indicate that the shear deformation of utility tunnel joints can be categorized into elastic, crack propagation, and damage stages. In the course of joint-shear deformation, the middle utility tunnel sustains centrosymmetric failure. The degree of deformation of the large cabin is greater than that of the small cabin, while the damage to the small cabin is more severe. When the utility tunnel is subjected to the same load, the joint dislocation under the gravelly sand foundation is the smallest, but the damage range is the largest and the cracks are the most. Local strengthening and protection are needed at the chamfer, near the bolt hole, and the top and bottom. The stratum conditions have little effect on the shear stiffness of the joint during the elastic stage, but they have a significant impact during the crack propagation and damage stages. Finally, the joint damage area is approximately 15% of the total utility tunnel, and the deformation region of the longitudinal connectors is approximately 16% of its length.

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来源期刊
Journal of Civil Structural Health Monitoring
Journal of Civil Structural Health Monitoring Engineering-Safety, Risk, Reliability and Quality
CiteScore
8.10
自引率
11.40%
发文量
105
期刊介绍: The Journal of Civil Structural Health Monitoring (JCSHM) publishes articles to advance the understanding and the application of health monitoring methods for the condition assessment and management of civil infrastructure systems. JCSHM serves as a focal point for sharing knowledge and experience in technologies impacting the discipline of Civionics and Civil Structural Health Monitoring, especially in terms of load capacity ratings and service life estimation.
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