Based on the characteristics of stress axisymmetric of the anchorage body

an experimental device of anchor-soil interface is developed. By means of 2D digital speckle correlation method

the displacement field and the strain field of soil surrounding anchorage body are obtained. Experimental results show that

the deformation of the surrounding soil caused by the displacement of the anchor is mainly in a small thin layer that is near the anchorage body

and its deformation is characterized by stable range

continuous

linear and shear dilation. On this basis

the constitutive relationship of the anchorage body interface layer is established according to the flow rule associated with Coulomb yield condition

and then the expressions of axial force and shear stress distribution under the condition of drawing load are deduced. The result indicates that the degree of uniformity of shear stress on anchorage body is closely related to soil compactness. The lower the soil compaction

the smaller the resistance coefficient and the angle of internal friction

and the shear stress distribution is more uniform on the anchor. While for the soil with larger resistance coefficient and internal friction

the shear stress distribution is similar to the theory and measured results of the rock anchor solid.