Gibson地基中竖向灌浆锚杆承载力研究  

Pull-out Capacity of Vertical Grouting Anchor in Gibson Foundation

作　　者：刘秀军 LIU Xiujun(State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116;Shenzhen Geotechnical Investigation&Surveying Institute(Group)Co.Ltd.,Shenzhen 518028)

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [2]深圳市勘察测绘院(集团)有限公司,广东深圳518028

出　　处：《土工基础》2022年第5期752-759,共8页Soil Engineering and Foundation

摘　　要：假定竖向灌浆锚杆周边岩土体的剪切刚度和极限剪应力随深度线性增长,在塑性变形区内剪切刚度由塑性变形区深度zt处至锚杆顶部线性衰减至零,对竖向灌浆锚杆的荷载传递机理进行理论分析,并在此基础上,分析了深度变化系数对锚杆剪应力分布的影响。研究结果表明:在竖向灌浆锚杆的设计计算中,合理考虑岩土体力学性质随深度增加的特性,可更加真实地反映锚杆荷载传递过程。It is assumed that the shear stiffness and the ultimate shear stress of the rock and soil surrounding the vertical grouting anchor increase linearly with the depth.At the same time,if the shear stiffness in the plastic deformation zone decreases linearly from a depth zt of the plastic deformation zone to the top of the anchor to zero,the load transfer mechanism of the vertical grouting anchor is theoretically analyzed.On this basis,the influence of the depth variation coefficient on the shear stress distribution of the anchor is analyzed.The evaluation results show that in the design and analysis of the vertical grouting anchor,the mechanical properties of the rock-soil are considered reasonably with the increase of depth,which can reflect the load transfer process of the bolt more realistic.

关 键 词：GIBSON地基 竖向灌浆锚杆 剪切刚度 荷载传递机理 剪切破坏深度 

分 类 号：TU472[建筑科学—结构工程]