To address issues such as insufficient stirring of resin anchoring agent, inadequate filling in reamed areas, eccentricity of cable bolts, and damage to hole walls during cable bolts reaming anchoring in soft rock roadways, a resin anchoring enhancement technology based on the Multi-segment Reaming Anchoring Enhancement (MRAE) component was proposed. Through theoretical analysis, the mechanisms of MRAE, including the "graded crushing-gradient stirring", the synergistic flow control of "ascending guidance-sealing", and the "centralized limiting-radial support" were revealed, and the mechanisms by which MRAE enhances the stirring effect of resin anchoring agent, the strength of the anchor solid, the pull-out resistance, and the centering performance of the cable bolt were also clarified. Besides, numerical simulations were conducted to comparatively analyze the characteristics of the stirring flow field of resin anchoring agent between MRAE and ordinary cable bolts, verifying that MRAE enhances the migration speed and diffusion range of resin. Moreover, laboratory experiments were performed to study the influence of MRAE on the drilling thrust, torque, and pull-out force of cable bolts. The results show that the average peak pull-out force of the enhanced anchoring group (36.5 kN) is 2.5 times that of the ordinary anchoring group (14.9 kN), and the centering degree is significantly improved. Field tests further verify the effectiveness of this technology. In soft rock roadways, both the pull-out force and pre-tightening force of the enhanced anchoring cable bolts meet the design values. The roof separation displacement is reduced by a factor of 1.52 compared with ordinary anchoring. Even under non-reaming conditions, its anchoring force still meets engineering requirements. The research results provide a theoretical basis and technical support for improving the anchoring quality of cable bolts in soft rock roadways.

soft rock roadway  /  reaming resin  /  MRAE  /  anchoring reinforcement  /  roof anchoring control