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<p>This paper presents a high-strength and high-elongation bolt, which is bonded with resin inside the rock mass. This kind of bolt includes two appearances of spiral groove/rib, corresponding to variable rib face angles, and the bonding performance is unknown. To analyze the resin bonding properties of these two kinds of bolts, the Finite-discrete element method (FDEM) technology was used. Firstly, the mechanical properties of the resin were calibrated, and then the bond-slip modes of bolts corresponding to variable rib face angles were analyzed. At a small rib face angle (30°), it is difficult for the bolt to cause obvious damage to the resin. The bearing capacity comes from the sliding friction between the rib and the resin, which is a bi-linear slip mode. At the large rib face angle (45–90°), the bearing capacity comes from the damage of the resin, which is a tri-linear or quadri-linear slip mode. Subsequently, the mechanical models of three bond-slip modes were established, and the critical bonding length was analyzed. The results show that the critical bond length of the small rib face angle bolt is shorter than that of the large rib face angle bolt under the same bearing capacity demand. Finally, the pull-out test of resin bonding performance was carried out, and the spiral groove/spiral rib bolt showed different forms, which were consistent with the numerical results. The spiral groove bolt rotates during the pull-out process, and there is no resin residue on the surface; the bearing capacity comes from the sliding friction between the rib and the resin. The spiral rib bolt has no rotation, and there is obvious resin residue on the surface, indicating that the bearing capacity comes from the damage of the resin. The expansion effect of the small rib face angle bolt leads to concrete splitting failure earlier than the large rib face angle bolt. In general, the resin bonding performance of the spiral groove bolt with a small rib face angle is not as stable as that of spiral rib bolt, because its bearing capacity depends on factors such as confining pressures. Therefore, we recommend spiral rib as the appearance design for the rockbolt.</p>

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Investigation of Resin Bonding Mechanics of Spiral Bolts with Variable Rib Face Angles: Experimental and Simulation Approach

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Jiawang Zhan,
  • Jun Yang,
  • Kexue Wang,
  • Wenhui Bian

摘要

This paper presents a high-strength and high-elongation bolt, which is bonded with resin inside the rock mass. This kind of bolt includes two appearances of spiral groove/rib, corresponding to variable rib face angles, and the bonding performance is unknown. To analyze the resin bonding properties of these two kinds of bolts, the Finite-discrete element method (FDEM) technology was used. Firstly, the mechanical properties of the resin were calibrated, and then the bond-slip modes of bolts corresponding to variable rib face angles were analyzed. At a small rib face angle (30°), it is difficult for the bolt to cause obvious damage to the resin. The bearing capacity comes from the sliding friction between the rib and the resin, which is a bi-linear slip mode. At the large rib face angle (45–90°), the bearing capacity comes from the damage of the resin, which is a tri-linear or quadri-linear slip mode. Subsequently, the mechanical models of three bond-slip modes were established, and the critical bonding length was analyzed. The results show that the critical bond length of the small rib face angle bolt is shorter than that of the large rib face angle bolt under the same bearing capacity demand. Finally, the pull-out test of resin bonding performance was carried out, and the spiral groove/spiral rib bolt showed different forms, which were consistent with the numerical results. The spiral groove bolt rotates during the pull-out process, and there is no resin residue on the surface; the bearing capacity comes from the sliding friction between the rib and the resin. The spiral rib bolt has no rotation, and there is obvious resin residue on the surface, indicating that the bearing capacity comes from the damage of the resin. The expansion effect of the small rib face angle bolt leads to concrete splitting failure earlier than the large rib face angle bolt. In general, the resin bonding performance of the spiral groove bolt with a small rib face angle is not as stable as that of spiral rib bolt, because its bearing capacity depends on factors such as confining pressures. Therefore, we recommend spiral rib as the appearance design for the rockbolt.