| 悬索桥隧道锚承载能力和变形特征研究综述 |
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| 引用本文： | 张宜虎,邬爱清,周火明,王帅,罗荣,范雷.悬索桥隧道锚承载能力和变形特征研究综述[J].岩土力学,2019,40(9):3576-3584. |
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| 作者姓名： | 张宜虎 邬爱清 周火明 王帅 罗荣 范雷 |
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| 作者单位： | 长江科学院 水利部岩土力学与工程重点实验室，湖北 武汉 430010 |
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| 基金项目： | 国家自然科学基金项目（No.41702319，No.51409013）；中央级公益性科研院所基本科研业务费项目（No.CKSF2017024/YT） |
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| 摘 要： | 隧道锚作为悬索桥相对新型的锚固形式,对其理论和实践认知都还比较欠缺。首先从抗拔承载安全和锚碇变形控制两方面归纳了当前隧道锚工程普遍采用的安全控制指标;然后分别总结了隧道锚承载能力和变形特征的研究方法;对项目团队20年来针对10余个隧道锚工程所开展的专题研究成果进行总结,得出目前已建和在建隧道锚在主缆数万吨级荷载下的变形普遍为mm级、隧道锚的超载稳定性系数普遍大于7的结论,说明目前已建和在建隧道锚存在较大安全裕度,隧道锚设计还存在一定优化空间;同时指出目前规范建议的隧道锚变形控制标准是基于桥梁结构提出的,没有考虑锚体自身及围岩等材料对变形的限制要求;总结出隧道锚承载能力主要是锚体混凝土及围岩系统的承载能力,没有考虑钢绞线材料强度等其他可能控制锚碇系统承载能力的因素。研究结论具有其特定条件和适用范围,后续对隧道锚系统的承载机制等科学问题还有待进一步研究。
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| 关 键 词： | 悬索桥 隧道锚 承载能力 变形特征 |
| 收稿时间： | 2018-06-28 |
Review of bearing capacity and deformation characteristics of tunneltype anchorage for suspension bridge |
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| ZHANG Yi-hu,WU Ai-qing,ZHOU Huo-ming,WANG Shuai,LUO Rong,FAN Lei.Review of bearing capacity and deformation characteristics of tunneltype anchorage for suspension bridge[J].Rock and Soil Mechanics,2019,40(9):3576-3584. |
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| Authors: | ZHANG Yi-hu WU Ai-qing ZHOU Huo-ming WANG Shuai LUO Rong FAN Lei |
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| Institution: | Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Changjiang River Scientific Research
Institute, Wuhan, Hubei 430010, China |
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| Abstract: | Currently, there is a lack of information on the theory and practice of the relatively new tunnel-type anchorage for suspension bridges. Firstly, the safety control indexes commonly used in tunnel anchorage engineering are summarized from two aspects of anti-draw bearing safety and anchorage deformation control. Then the research methods are analyzed for the bearing capacity and deformation characteristics of tunnel-type anchorage, respectively. Finally, the achievements of more than 10 tunnel anchor projects in the project team for the past 20 years are summarized. It is concluded that the deformation of the existing and under construction tunnel-type anchorages are generally in the order of millimeters, and the overload stability coefficient of the anchorage is usually greater than seven under tens of thousands of tons load of the main cable. It shows that the existing and under construction tunnel-type anchorages have a sufficient safety margin, and the design of tunnel-type anchorage can be optimized to a certain extent. At the same time, it is pointed out that the current proposed deformation control standard of tunnel anchor is based on the bridge structure and does not take into account the restrictions on the deformation of materials such as anchor body itself and surrounding rock. The bearing capacity of tunnel anchorage summarized in this paper is mainly from the bearing capacity of anchor concrete and surrounding rock system, without considering from other factors such as the strength of steel strand material. The conclusions in this paper have their specific conditions and scope of application, and further research on the bearing mechanism of tunnel anchor system is required. |
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| Keywords: | suspension bridge tunnel-type anchorage bearing capacity deformation characteristics |
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