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《Chinese Journal of Rock Mechanics and Engineering》 2007-04
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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

HU Bo1,ZENG Qianbang1,RAO Dan2,WANG Sijing1,PENG Yundong3,LIU Bo3,LIU Huanyu4,ZHAO Haibin5(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)  
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.
【Fund】: 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)
【CateGory Index】: U448.25
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