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

作　　者：刘建荣 栾恒杰[2] 蒋宇静 商和福[4] 王明强 王长盛 张孙豪 LIU Jianrong;LUAN Hengjie;JIANG Yujing;SHANG Hefu;WANG Mingqiang;WANG Changsheng;ZHANG Sunhao(Academician(Expert)Workstation,Inner Mongolia Shanghaimiao Mining Co.,Ltd.,Ordos Inner Mongolia 016299,China;State Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology,Qingdao Shandong 266590,China;Graduate School of Engineering,Nagasaki University,Nagasaki 8528521,Japan;Yankuang Energy Group Company Limited,Jining Shandong 272000,China)

机构地区：[1]内蒙古上海庙矿业有限责任公司院士专家工作站,内蒙古鄂尔多斯016299 [2]山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地,山东青岛266590 [3]长崎大学工学研究科,日本长崎8528521 [4]兖矿能源集团股份有限公司,山东济宁272000

出　　处：《矿业科学学报》2025年第2期173-183,共11页Journal of Mining Science and Technology

基　　金：鄂尔多斯市标志性创新团队项目(TD20232307);国家自然科学基金(52104093);中央引导地方科技发展专项资金项目(YDZX2022141)。

摘　　要：认识锚固节理岩体剪切力学行为对岩体工程稳定性控制至关重要。通过开展恒定法向应力和恒定法向刚度边界条件下锚固和非锚固节理岩体直剪试验,并结合声发射技术,系统分析了初始法向应力、法向刚度影响下的节理岩体剪切力学特征、声发射特性及损伤破坏机制。结果表明:在CNL边界下,剪切应力-剪切位移曲线应力软化特征明显,在CNS边界下,曲线表现出由应力软化向应力硬化转变的趋势;τ_(1)和τ_(2)均随法向应力的增大而增加,法向刚度对τ_(2)的大小有显著提升;在CNS边界下,试样法向位移表现出由剪缩向剪胀转变的趋势,且非锚固节理试样剪缩和剪胀现象更为明显;锚固节理试样的AE能量和累计AE能量显著高于非锚固节理试样;AE定位点主要分布在节理面相交处及锚杆附近,CNS边界条件下AE定位点分布更集中;随着法向应力和法向刚度的增大,节理面破坏区域由孔壁附近向四周扩展,锚杆孔壁的破坏范围减小,锚杆呈现出“Z”型破坏特征。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 τ_(1) and τ_(2) increased with increasing normal stress,and the normal stiffness significantly enhanced the magnitude of τ_(2.3))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 

分 类 号：TD353[矿业工程—矿井建设]