| 锚碇–围岩系统在拉剪复合应力条件下的变形规律及破坏机制研究——以坝陵河特大岩锚悬索桥为例 |
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| 引用本文： | 胡 波,曾钱帮,饶 旦,王思敬,彭运动,刘 波,刘环宇,赵海滨.锚碇–围岩系统在拉剪复合应力条件下的变形规律及破坏机制研究——以坝陵河特大岩锚悬索桥为例[J].岩石力学与工程学报,2007,26(4):712-719. |
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| 作者姓名： | 胡 波 曾钱帮 饶 旦 王思敬 彭运动 刘 波 刘环宇 赵海滨 |
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| 作者单位： | [1]中国科学院工程地质力学重点实验室,北京100029 [2]长江水利委员会设计院,湖北武汉430010 [3]中交公路规划设计院,北京100010 [4]建设综合勘察研究设计院,北京100007 [5]中国水电工程顾问集团公司中南勘测设计研究院,湖南长沙410014 |
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| 基金项目： | 国家重点基础研究规划（973）项目（2002CB412702）;交通部科技教育司“坝陵河特大桥梁建设关键技术研究”项目（200531800019） |
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| 摘 要： | 锚碇基础是悬索桥的关键受力部位,认识它的变形规律和破坏机制是评价其强度和稳定性的前提。岩体现场缩尺拉拔模型试验发现,锚碇后锚面上,围岩位移呈马鞍形分布,残余变形率呈V形分布;侧壁围岩位移呈倒塞体形分布,永久变形比例高。FLAC3D数值模拟发现,应力场分布具有明显的分段特征,前段和后段锚体围岩有着不同的应力传递路径;塑性变形主要发生在锚体周边及上部岩体中,破坏形态类似塞体状;围岩–锚碇系统可能发生整体拉剪复合破坏。设计和施工过程中,应对塑性区及显著变形区内的岩体进行重点加固。
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| 关 键 词： | 岩石力学 锚塞 拉拔模型试验 快速拉格朗日分析 马鞍形 显著变形区 位移残余率 破坏机制 |
| 文章编号： | 1000-6915（2007）04-0712-08 |
| 收稿时间： | 2006-09-11 |
| 修稿时间： | 2006-11-03 |
STUDY ON DEFORMATION LAW AND FAILURE MECHANISM OF ANCHORAGE-SURROUNDING ROCK SYSTEM UNDER TENSILE-SHEAR COMPLEX STRESSES--TAKING SUPER-LARGE SUSPENSION BRIDGE ON BALING RIVER FOR EXAMPLE |
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| HU Bo,ZENG Qianbang,RAO Dan,WANG Sijing,PENG Yundong,LIU Bo,LIU Huanyu,ZHAO Haibin.STUDY ON DEFORMATION LAW AND FAILURE MECHANISM OF ANCHORAGE-SURROUNDING ROCK SYSTEM UNDER TENSILE-SHEAR COMPLEX STRESSES--TAKING SUPER-LARGE SUSPENSION BRIDGE ON BALING RIVER FOR EXAMPLE[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(4):712-719. |
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| Authors: | HU Bo ZENG Qianbang RAO Dan WANG Sijing PENG Yundong LIU Bo LIU Huanyu ZHAO Haibin |
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| Affiliation: | 1.Key Laboratory of Engineering Geomechanics,Chinese Academy of Sciences,Beijing 100029,China;2.Changjiang Water Resources Commission,Wuhan,Hubei 430010,China;3.China Communications Highway Planning and Design Institute,Beijing 100010,China;4.China Institute of Geotechnical Investigation and Surveying,Beijing 100007,China;5.Mid-south Design and Research Institute,China Hydropower Engineering Consulting Group Co.,Changsha,Hunan 410014,China |
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| Abstract: | Anchor basement is the key bearing component of suspension bridge;and its deformation and failure mechanism is the foundation of strength and stability evaluation.Several facts are found through the in-situ pull model test.The total displacement and the rate of residual displacement on the back anchor face show saddle and V-shaped distribution,respectively.The displacement of the surrounding rock on the flank appears plug-style distribution,and the rate of the permanent deformation is high.According to the numerical model test to be by fast Lagrangian analysis of continuum in 3D(FLAC3D),some conclusions are also drawn:(1) the stress field shows subsection character,and the stress transfer route between fore part and back part of the anchor body is different;(2) the plastic zones which appear plug-style are mainly found beside the anchor and in the upper rock mass;(3) tensile-shear complex failure maybe happen in the rock-anchor system.The plastic zones and the prominent deformation zones in the rock mass should be paid more attention during design and construction. |
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| Keywords: | rock mechanics anchoring plug pull model test fast Lagrangian analysis of continuum(FLAC) saddle prominent deformation zone residual rate of displacement failure mechanism |
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