Numerical simulation analysis of anchor pullout under radial pressurization of anchor solid

Abstract

Abstract The rock structure of weak rock formation is loose with low strength, which is easy to deform. Due to insufficient elongation and bearing capacity, anchor anchorage system damage is frequent and serious. Given the above problems, this paper researches the radial increase in compressive stress anchoring mechanism and uses finite element software ABAQUS simulation algorithms to obtain different radial pressurization conditions under the deformation of the surrounding rock law and the anchor pulling the anchor and the surrounding rock displacement stress change rule. The results show that when applying the radial pressure of 1.5 MPa, the surrounding rock and the anchor stress reach their maximum value, and the displacement reaches its minimum value. Field testing and monitoring results show that radial pressurized anchors can effectively control the deformation of the roadway perimeter rock and improve the anchoring effect.