矿业科学学报2025，Vol.10Issue(2)：173-183,11.DOI:10.19606/j.cnki.jmst.2024928
法向边界条件对锚固节理岩体剪切力学及声发射特征的影响研究
Effect of normal boundary conditions on the shear mechanics and acoustic emission characteristics of anchored rock joints
摘要
Abstract
Understanding the shear mechanical behavior of anchored rock joints is crucial for controlling of the stability of rock engineering structures.This study conducted direct shear tests on anchored and unanchored rock joints under constant normal load(CNL)and constant normal stiffness(CNS)bound-ary conditions.We also adopted the acoustic emission(AE)technology to analyze the shear mechanical characteristics,AE characteristics,damage and failure mechanisms of jointed rock mass under initial normal stress and normal stiffness.Results show that 1)under the CNL boundary,the shear stress-shear displacement curve exhibited explicit stress softening,while under the CNS boundary,the curve showed transition from stress softening to stress hardening.2)both τ1 and τ2 increased with increasing normal stress,and the normal stiffness significantly enhanced the magnitude of τ2.3)Under the CNS boundary,the normal displacement of the sample showed transition from shear contraction to shear ex-pansion,and the shear contraction and expansion were more pronounced in unanchored joint samples.4)The AE energy and cumulative AE energy of the anchored joint samples were significantly higher than those of the unanchored joint samples.5)AE localization points were mainly distributed at the intersections of the joint surfaces and near the anchor bars,and the distribution of AE points was more concentrated under the CNS boundary conditions.6)As the normal stress and normal stiffness in-creased,the damage area of the joint surface expanded from the vicinity of the hole wall to the sur-rounding area,the damage range of the anchor hole wall decreased,and the anchor bars exhibited"Z"type failure.关键词
恒定法向应力/恒定法向刚度/锚固节理/剪切特性/声发射Key words
constant normal load/constant normal stiffness/anchored joint/shear characteristics/a-coustic emission分类
矿山工程引用本文复制引用
刘建荣,栾恒杰,蒋宇静,商和福,王明强,王长盛,张孙豪..法向边界条件对锚固节理岩体剪切力学及声发射特征的影响研究[J].矿业科学学报,2025,10(2):173-183,11.基金项目
鄂尔多斯市标志性创新团队项目(TD20232307) （TD20232307）
国家自然科学基金(52104093) （52104093）
中央引导地方科技发展专项资金项目(YDZX2022141) （YDZX2022141）
