(1. School of Civil Engineering，Shaoxing University，Shaoxing，Zhejiang 312000，China；2. Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province，Shaoxing University，Shaoxing，Zhejiang 312000，China；3. State Key Laboratory for Tunnel Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China)
Abstract：The shear support performance of 2G-NPR bolts has been verified; however，their damage behavior under fatigue loading remains to be further explored. Through laboratory pre-peak cyclic loading tests，the shear mechanical properties of PR steel(Q235 steel) and 2G-NPR steel bolted rock joints were compared，exploring the effects of different normal stresses，roughness，shear amplitudes，and rates on the shear fatigue damage characteristics of 2G-NPR steel bolted rock joints. The results show that：(1) As the normal stress increases，the shear strength of PR steel bolted rock joints exhibits a marked decrease after an initial increase in the number of cycles，whereas the shear strength of 2G-NPR steel bolted rock joints gradually increases. This trend underscores the significant role of the negative Poisson?s ratio effect in enhancing the shear fatigue performance of the 2G-NPR steel bolts. (2) The peak and residual shear strengths of 2G-NPR steel bolted rock joints significantly increase with higher shear rates and normal stresses，but are less affected by changes in joint surface roughness and shear amplitude. Additionally，the pre-peak shear stiffness of these joints increases with roughness，shear rate，and normal stress，while shear amplitude has only a minor effect. The flexural angle of the anchor rod increases with the roughness，shear amplitude，and shear rate. (3) The ratio of shear force to axial force of 2G-NPR anchor bolts is consistently lower than that of PR anchor bolts under different cyclic loading conditions，indicating that the 2G-NPR bolts can effectively withstand axial force during shear deformation，thus maintaining the stability and support effectiveness of the rock mass. This research offers a valuable reference for the application of 2G-NPR anchor bolts in rock mass support engineering，particularly in regions prone to microseismic activity.
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2025, Vol. 44 
