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