土工基础

土工基础 ›› 2022, Vol. 36 ›› Issue (5): 752-759.

• 专题论述 • 上一篇    下一篇

Gibson地基中竖向灌浆锚杆承载力研究

刘秀军1,2   

  1. （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）
  • 收稿日期:2021-03-03 修回日期:2021-03-12 出版日期:2022-10-30 发布日期:2022-10-24
  • 作者简介:刘秀军（1983-），男，博士研究生，高级工程师，注册土木工程师（岩土），研究方向为岩土工程检测等。

Pull-out Capacity of Vertical Grouting Anchor in Gibson Foundation

LIU Xiujun1,2   

  1. (1.State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116；2.Shenzhen Geotechnical Investigation & Surveying Institute (Group) Co. Ltd., Shenzhen 518028)
  • Received:2021-03-03 Revised:2021-03-12 Online:2022-10-30 Published:2022-10-24

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。

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

Abstract: 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.


Key words: Gibson Foundation, Vertical Grouting Anchor, Shear Stiffness, Load Transfer Mechanism, Depth of Shear Failure

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