作　　者： ; ; ; ;

机构地区： 重庆大学土木工程学院

出　　处： 《岩石力学与工程学报》 2007年第A01期2755-2760,共6页

摘　　要： 针对典型岩土体边坡,通过室内模拟试验,研究锚力变化或锚失效在群锚中引起的荷载转移现象,探讨群锚失效后边坡稳定性的劣化过程、失稳形态以及坡面设置格子梁对锚索张力及边坡稳定性的影响等问题。群锚抑制坡体的变形效应,可使岩体均匀性、整体性加强,增加韧性和承受大变形而不破坏的能力。群锚中某一锚索锚力变化会导致其承担的荷载在群锚内部发生较明显的转移现象,结构面压缩带同时被削弱,结构面的整体安全度降低;某一锚索的失效也会引起相邻锚索接连失效的多米洛效应,导致边坡稳定性急剧降低。坡面施加格子梁结构可调动坡面更大范围岩土体发挥自承能力,分担锚索承担的部分荷载,改善边坡的稳定性。岩坡加固设计中应注意格子梁结构强度与锚索锚固力相匹配。 A series of laboratory model tests are carried out for typical rock slope in order to find load transfer phenomenon among anchor group resulted from anchor-hold variation or anchor failure.The deterioration process of slope stability and the instability appearance are studied.The influences of sash girders placed on slope face on tensile force in anchor cables and slope stability are discussed too.Anchor groups restrains slope deformation,makes rock mass uniform and solid,increases tenacity and the ability to bear great distortion without break.Anchor-hold variation in single anchor would obviously cause load transfer among anchor group.The structural plane compressive zone is weakened at the same time,and the general safety degree becomes lower.The single anchor failure will also cause the domino effect of anchor group,and slope stability decreases rapidly.Sash Girder structures placed on slope face can induce self bearing capacity of soil,share partial load carried by anchor group and improve slope stability.Sash girder structural strength should match the anchoring force mutually in slope reinforcing design.

关 键 词： 边坡工程 预应力锚索 失效 群锚效应 模型试验

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