Variation of Axial and Shear Forces of the Ground Anchor During Shearing
This paper presents the evolution and contribution of axial and shear forces of the ground anchor during the shearing process of anchored joint interface.A numerical simulation of the direct shear test on the anchored joint interface was performed by using the FLAC3D software.The"pile"element is used instead of the conventionally used"cable"element to simulate the ground anchor.The distribution and evolution characteristics of both the axial and the shear forces of the anchor are studied during the shearing process.The effects of the ground anchor diameter,anchor inclination,and surrounding rock strength on the axial and shear forces of the bolt are analyzed.The results show that:(1)The shear force and the axial force of the ground anchor at the joint reach the maximum value,which are small at both ends,the shear force reaches a large value with a small displacement,and the exertion of the axial force is relatively lagging,two"plastic hinge"points appeared on the bolt within a range of about 5D on both sides of the joint,and there is a"pull-shear zone"in which the bolt deforms sharply between the plastic hinge points.(2)The peak shear strength of the joint is increased by about 70％after the anchoring,and the reinforcing effect of the ground anchor on the joint can be equivalent to increasing the cohesion of the joint.(3)With the diameter increa-ses,the shear force of the anchor increases significantly,but the axial force decreases.When the inclination of the bolt is 60°,the maximum equivalent shear strength of the joint converted from the axial force and the shear force is obtained;Compared with the soft rock,hard rock is more conducive to the exertion of the bolt's axial and shear forces.
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