| 悬索桥隧道式复合锚碇承载特征分析 |
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| 引用本文： | 焦长洲,高波,汪海滨.悬索桥隧道式复合锚碇承载特征分析[J].公路,2008(4):60-64. |
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| 作者姓名： | 焦长洲 高波 汪海滨 |
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| 作者单位： | 1. 西南交通大学土木工程学院,成都市,610031
2. 中国科学院武汉岩土力学研究所,武汉市,430071 |
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| 基金项目： | 西藏交通厅资助项目
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西南交通大学校科研和教改项目 |
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| 摘 要： | 采用三维显式有限差分法(FLAC3D)对隧道式复合锚碇中岩锚、锚塞体单独作用下及整体共同作用下的承载特性进行了数值模拟试验,分析了受力体系在不同主缆拉力及不同岩锚预应力工况条件下,岩体的变形和应力响应特征。结果表明:岩锚及锚塞体单独作用下均能满足悬索桥的受力及稳定性要求,合理的岩锚初始预应力值有利于隧道式锚碇的受力分配及承力时机,岩锚和锚塞体的系统刚度匹配决定了隧道式复合锚碇的极限承载比例分配,分析结果对隧道式锚碇的设计提供了依据。
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| 关 键 词： | 桥梁与隧道工程 隧道式复合锚碇 数值试验 初始预应力 受力分配 |
| 文章编号： | 0451-0712(2008)04-0060-05 |
| 修稿时间： | 2007年10月20 |
Analysis of Load-Bearing Characteristic of Tunnel-Type Compound Anchorage of Suspension Bridge |
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| JIAO Chang-zhou,GAO Bo,WANG Hai-bin.Analysis of Load-Bearing Characteristic of Tunnel-Type Compound Anchorage of Suspension Bridge[J].Highway,2008(4):60-64. |
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| Authors: | JIAO Chang-zhou GAO Bo WANG Hai-bin |
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| Abstract: | The numerical analysis is conducted on the carrying capacity of the tunnel-type compound anchorage based on rock cable only,anchoring body only and the combination of both.The analysis is performed by a three-dimensional explicit finite-difference program.The displacement of the rock and the stress response are studied for different main cable tensions and different rock cable prestressing values.The results show that the suspension bridge carrying capacity and stability requirements can be met using rock cable only or anchoring body only.The prestressing force in the rock cable improves the stress distribution in the rock cable.The ultimate capacity of the tunnel compound anchorage is determined by the stiffness of the rock cable as well as the anchoring body.This analysis provides the theoretical support for the tunnel anchoring method currently used in engineering design. |
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| Keywords: | bridge and tunnel engineering tunnel-type compound anchoring numerical test initial prestress bearing distribution |
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