深中通道沉管临时锚固系统安全分析

IF 7.4 2区 工程技术 Q1 ENGINEERING, CIVIL Journal of Traffic and Transportation Engineering-English Edition Pub Date : 2024-08-01 DOI:10.1016/j.jtte.2024.04.002
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引用次数: 0

摘要

在深中通道建设中,采用了沿管壁均匀分布的临时锚固系统。为了评估该系统的安全性和可靠性,采用了数值分析和模型试验相结合的方法来研究临时锚固系统的安全性和拉杆的可靠性。首先,建立了基于 GINA 回弹力的沉箱段整体模型,以分析整个系统的应力状态。其次,对单一张拉系统进行了全面的数值分析和模型试验验证,揭示了其失效模式和安全裕度。结果表明,在水下连接过程中,拉杆系统的均匀应力平均为 444 kN,安全系数为 1.94。此时,最大 von Mises 应力出现在前板四角和 U 形槽下缘,应力值分别为 181.8 兆帕和 172.4 兆帕,安全系数分别为 1.54 和 1.71。当拉杆力达到 940 kN 时,拉伸系统达到承载极限,前板角部出现初始屈服。为验证理论分析结果,我们进行了模型试验,在测试载荷为 444 kN 时,前板四角和 U 形槽下缘的应力分别为 159.6 和 195.9 MPa。当测试载荷增加到 940 kN 时,这些应力分别达到 390 和 389 MPa,与数值分析结果吻合。考虑到载荷和材料的不确定性,对拉杆进行了可靠性分析,得出可靠性指数为 4.34,符合二级安全标准。根据综合分析,可以得出结论,深中通道沉箱段临时锚固系统具有良好的安全裕度。
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Safety analysis of temporary anchorage system for immersed tube in Shenzhen–Zhongshan Link

In the construction of the Shenzhen–Zhongshan Link, a temporary anchorage system, distributed uniformly along the pipe wall, has been employed. To assess the safety and reliability of this system, a combined method utilizing numerical analysis and model experiments was applied to study the safety of the temporary anchorage system and the reliability of the tension rods. Firstly, an overall model of the caisson segment based on GINA rebound force was established to analyze the stress state of the entire system. Secondly, a comprehensive numerical analysis and model experiment verification were conducted for the single tensioning system, revealing its failure mode and safety margin. The results indicate that the tension rod systems are uniformly stressed at an average of 444 kN during underwater jointing, with a safety factor of 1.94. At this point, the maximum von Mises stresses appearing at the front plate corners and the lower edge of the U-groove, with stress values of 181.8 MPa and 172.4 MPa, and safety factors of 1.54 and 1.71, respectively. When the tension rod force reaches 940 kN, the tensioning system reaches its bearing limit, with initial yielding occurring at the front plate corners. Model experiments were conducted to verify the theoretical analysis results, under a test load of 444 kN, the stresses at the front plate corners and the lower edge of the U-groove were 159.6 and 195.9 MPa, respectively. As the test load increased to 940 kN, these stresses reached 390 and 389 MPa, exhibiting good agreement with the numerical analysis. Considering the uncertainty of loads and materials, a reliability analysis of the tension rods was conducted, yielding a reliability index of 4.34, meeting the secondary safety standard. Based on the comprehensive analysis, it can be concluded that the temporary anchorage system in the caisson segments of the Shenzhen–Zhongshan Link exhibits excellent safety margins.

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来源期刊
CiteScore
13.60
自引率
6.30%
发文量
402
审稿时长
15 weeks
期刊介绍: The Journal of Traffic and Transportation Engineering (English Edition) serves as a renowned academic platform facilitating the exchange and exploration of innovative ideas in the realm of transportation. Our journal aims to foster theoretical and experimental research in transportation and welcomes the submission of exceptional peer-reviewed papers on engineering, planning, management, and information technology. We are dedicated to expediting the peer review process and ensuring timely publication of top-notch research in this field.
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