文献类型：期刊文献

中文题名：微观负泊松比锚杆锚固结构面峰前循环剪切疲劳损伤特性研究

英文题名：Study on the pre-peak cyclic shear fatigue damage characteristics of 2G-NPR bolted rock joints

作者：黄曼[1,2];郭志炜[1,2];洪陈杰[3];陶志刚[3];黄觐[1,2];张贺[1,2]

机构：[1]绍兴文理学院土木工程学院,浙江绍兴312000;[2]绍兴文理学院浙江省岩石力学与地质灾害重点实验室,浙江绍兴312000;[3]中国矿业大学(北京)隧道工程灾变防控与智能建养全国重点实验室,北京100083

年份：2025

卷号：44

期号：3

起止页码：543

中文期刊名：岩石力学与工程学报

外文期刊名：Chinese Journal of Rock Mechanics and Engineering

收录：北大核心2023、、EI(收录号：20250917960443)、北大核心

基金：国家自然科学基金资助项目(42272333,42377154)。

语种：中文

中文关键词：岩石力学;峰前循环荷载;2G-NPR钢;锚固结构面;剪切特性;能量吸收特性

外文关键词：rock mechanics;pre-peak cyclic loading;2G-NPR steel;bolted rock joints;shear characteristics;energy absorption characteristics

中文摘要：微观负泊松比(2G-NPR)锚杆抗剪切的支护性能已得到验证,但其在疲劳荷载下的损伤行为仍需进一步研究。通过室内峰前循环试验,比较PR钢(Q235钢)和2G-NPR钢锚固结构面的剪切力学特性,并探讨不同法向应力、粗糙度、剪切幅值和速率对2G-NPR钢锚固结构面剪切疲劳损伤特性的影响。结果表明:(1)随着法向应力的增加,PR钢锚固结构面的抗剪强度在循环次数增加后显著下降,而2G-NPR钢锚固结构面的抗剪强度逐步提升,体现了负泊松比效应对提升抗剪疲劳性能的重要性;(2)2G-NPR钢锚固结构面的峰值和残余抗剪强度随剪切速率和法向应力增加显著提高,受粗糙度和剪切幅值影响较小;峰前剪切刚度随粗糙度、剪切速率和法向应力增加而增大,剪切幅值影响较小;锚杆挠曲角随粗糙度、剪切幅值和速率增加而增大;(3)2G-NPR锚杆在不同循环次数下的剪切力与轴向力比值均低于PR锚杆,表明其在抵抗剪切变形时能够有效承受轴向力,确保岩体的支护效果。上述研究可为2G-NPR锚杆在微震区岩体支护工程中的应用提供一定参考。

外文摘要：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.