基于比例模型试验和图像处理的悬索桥隧道型锚固破坏模式评价

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.24.5.457
S. Seo, H. Lim, M. Chung
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引用次数: 4

摘要

本文采用试验试验和图像处理分析的方法,对悬索桥隧道型锚杆的拉拔行为进行了研究。对隧道型锚固的初始破坏行为和破坏模式进行了研究。为了评价隧道型锚固的破坏模式,以蔚山大桥原型锚固为基础,进行了一系列的比例模型试验。在模型试验中,锚固体和围岩采用石膏混合料制作。研究了在平面应变条件下的拉拔行为。模型试验结果表明,隧道型锚杆发生楔形破坏。此外,破坏模式会根据围岩和锚固体物理性质的不同以及锚板尺寸的不同而发生变化。发现锚板的尺寸是决定其破坏模式的重要参数。但围岩与锚固体物理性质的差异并不影响锚固体的大小。此外,本研究通过图像分析分析了隧洞型锚固的初始破坏行为,并根据图像分析确认了破坏是由隧洞内部向围岩依次传递的。隧道式锚杆设计的合理破坏模式应为楔型而非拉拔型。
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Evaluation of failure mode of tunnel-type anchorage for a suspension bridge via scaled model tests and image processing
In this study, the pull-out behavior of a tunnel-type anchorage for suspension bridges was investigated using experimental tests and image processing analyses. The study focused on evaluating the initial failure behavior and failure mode of the tunnel-type anchorage. In order to evaluate the failure mode of tunnel-type anchorage, a series of scaled model tests were conducted based on the prototype anchorage of the Ulsan Grand Bridge. In the model tests, the anchorage body and surrounding rocks were fabricated using a gypsum mixture. The pull-out behavior was investigated under plane strain conditions. The results of the model tests demonstrate that the tunnel-type anchorage underwent a wedge-shaped failure. In addition, the failure mode changed according to the differences in the physical properties of the surrounding rock and the anchorage body and the size of the anchor plate. The size of the anchor plate was found to be an important parameter that determines the failure mode. However, the difference in physical properties between the surrounding rock and the anchorage body did not affect its size. In addition, this study analyzed the initial failure behavior of the tunnel-type anchorage through image analysis and confirmed that the failure was sequentially transferred from the inside of the tunnel to the surrounding rock according to the image analysis. The reasonable failure mode for the design of the tunnel-type anchorage should be wedge-type rather than pull-out type.
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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