| 铁路悬索桥隧道式锚碇设计计算方法研究 |
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| 引用本文： | 江南,黄林,冯君,张圣亮,王铎.铁路悬索桥隧道式锚碇设计计算方法研究[J].岩土力学,2020,41(3):999-1009. |
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| 作者姓名： | 江南 黄林 冯君 张圣亮 王铎 |
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| 作者单位： | 1. 西南交通大学 土木工程学院，四川 成都 610031；2. 西南交通大学 高速铁路线路工程教育部重点实验室，四川 成都 610031 |
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| 基金项目： | 国家自然科学基金资助项目（No.51408495）。 |
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| 摘 要： | 悬索桥锚碇分为隧道式锚碇和重力式锚碇，采用隧道锚能较好地利用锚址区的地质条件，工程量相对重力锚小，性价比高且对周边环境扰动小。然而，隧道锚尚未形成相对完整的定量设计方法，其设计和施工主要依靠工程经验。结合我国首座铁路悬索桥隧道式锚碇工程，总结分析了隧道锚的4种破坏模式，即锚碇体侧壁界面破坏、倒圆锥台破坏、边坡整体滑移及锚碇体压缩破坏；建立了隧道锚典型破坏模式的计算模型，并基于极限平衡理论推导出相应的承载力计算公式；使用有限元法对关键设计参数进行敏感性分析；给出了隧道锚设计计算操作流程及方法，并针对依托工程给出了一个较为完整的设计范例。研究成果对铁路悬索桥隧道式锚碇设计具有指导意义。
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| 关 键 词： | 隧道式锚碇 破坏模式 设计方法 有限元法 极限平衡 |
| 收稿时间： | 2019-04-16 |
| 修稿时间： | 2019-08-28 |
Research on design and calculation method of tunnel-type anchorage of railway suspension bridge |
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| JIANG Nan,HUANG Lin,FENG Jun,ZHANG Sheng-liang,WANG Duo.Research on design and calculation method of tunnel-type anchorage of railway suspension bridge[J].Rock and Soil Mechanics,2020,41(3):999-1009. |
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| Authors: | JIANG Nan HUANG Lin FENG Jun ZHANG Sheng-liang WANG Duo |
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| Institution: | 1. College of Civil Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China;
2. Key Laboratory of High-speed Railway Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan 610031, China |
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| Abstract: | The anchorage of suspension bridge is divided into tunnel-type anchorage and gravity anchorage. The tunnel-type anchorage can effectively use the geological conditions of the anchored area and requires less engineering in comparison with the gravity anchorage. It is also characterized with high cost performance and low disturbance to surrounding environment. However, the tunnel-type anchorage has yet to form a relatively complete, quantitative design method with its current design and construction mainly depend on engineering experience. Combined with the tunnel-type anchorage project of China’s first railway suspension bridge, four failure modes of tunnel-type anchorage are summarized and analyzed, that is, the interface failure of side wall of anchorage, the failure of inverted cone platform, the failure of slope sliding, and the compression failure of anchorage. The calculation model is established according to the typical failure mode, and the corresponding simplified calculation formula of bearing capacity is derived based on the limit equilibrium theory. The sensitivity analysis of the key design parameters is carried out by using the finite element method. The design and calculation method of tunnel-type anchorage are given, and a relatively complete design for the project is provided to set an example. The research results can help future design of tunnel-type anchorage of railway suspension bridge. |
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| Keywords: | tunnel-type anchorage failure mode design method finite element method limit equilibrium |
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