In order to improve the anchorage bearing capacity of hollow grouting anchor rods and effectively overcome the issue of foundation deformation caused by groundwater buoyancy, a novel multi-purpose prefabricated hollow grouting anchor rod with dense holes and branching grouting was developed. An orthogonal experimental method was used to design the anchor rod pull-out test scheme. Using numerical calculation methods, the response relationship between different design parameters (i.e., circumferential grouting hole number, axial grouting hole distance, hole diameter, and the offset angle between adjacent grouting holes, abbreviated as hole number, hole distance, hole diameter, and hole offset angle) and the anchor rod's tensile strength was studied. The optimal factor-level combination was obtained, and the real stress-displacement analysis was conducted on the anchor rod with the optimal factor-level combination. The results show that: The influence factors on the tensile strength of the anchor rod body follow the order: hole distance > hole number > hole offset angle > hole diameter, with the hole distance factor contributing the most (69.65%). The effect of the hole distance factor on the tensile strength of the rod is proportional. The anchor rod's pull-out anchorage deformation undergoes four stages: elastic bonding, plastic deformation, plastic failure, and slippage debonding. These results indicate that the bonding failure between the anchor rod and the concrete is the primary cause of the reduction in anchorage performance.
Huang Jinkun
,
Jin Rencai
,
Zhang Peng
,
Jiang Pingwei
,
Liu Ying
. Research on the Bearing Performance of a New Type of Prefabricated Dense Hole Belt Bifurcated Grouting Anchor Rod[J]. Chinese Journal of Underground Space and Engineering, 2025
, 21(S2)
: 683
-689
.
DOI: 10.20174/j.JUSE.2025.S2.18
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