摘要
为揭示加锚板裂化岩体失稳破坏的前兆特征及其演化规律,采用轴力传感器与声发射系统对加锚板裂试件单轴加载过程声-力多参量进行实时监测,结合临界慢化理论构建前兆信息识别体系,系统研究了声发射能率、累计能量与锚索轴力时序信号的阶段演化特征及其失稳前兆响应规律。研究结果表明:试件破坏前呈现显著的时序特征异变:锚索轴力、声发射能率与累计能量的前兆响应时序依次滞后,其中锚索轴力失稳前兆较声发射参数提前10 s响应;基于临界慢化理论的方差分析显示,锚索轴力方差在塑性阶段末最先出现失稳前兆,较声发射能率方差和累计能量方差分别提前8 s,且三者方差前兆均较原始参数提前4 s;将锚索轴力原始时序参数及其方差作为主判据,声发射参数方差作为次判据。这一研究有助于揭示加锚板裂化围岩失稳破坏前兆信息,为矿山工程突发性破坏失稳破坏预警提供理论参考。
To investigate the precursor characteristics and evolution mechanisms of anchor-platecracked rock mass instability,this study conducts real-time monitoring of acoustic-mechanical multiparameters during uniaxial compression tests on anchor-plate-cracked specimens using axial force sensors and acoustic emission(AE)monitoring system.A precursor identification framework is established based on critical slowing-down theory,systematically investigating the stage evolution characteristics and precursor response patterns of AE energy rate,cumulative energy,and anchor cable axial force time-series signals.The results demonstrate significant temporal characteristic anomalies prior to specimen failure:sequential hysteresis occurs in precursor responses among anchor force,AE energy rate,and cumulative energy,with anchor force precursors responding 10 seconds earlier than AE parameters.Variance analysis through critical slowing-down theory reveals that anchor force variance first exhibits instability precursors at the end of plastic stage,8 seconds ahead of AE energy rate variance and cumulative energy variance.All variance-based precursors precede their original parameters by 4 seconds.Consequently,the original anchor force time-series parameters and their variances are proposed as primary criteria,with AE parameter variances serving as secondary criteria.This research provides theoretical references for revealing precursor information of anchor-platecracked surrounding rock instability and early warning of sudden instability failures in mining engineering.
作者
刘嘉成
于光远
韩强
梁鹏
张艳博
刘天一
王金松
LIU Jiacheng;YU Guangyuan;HAN Qiang;LIANG Peng;ZHANG Yanbo;LIU Tianyi;WANG Jinsong(School of Mining Engineering,North China University of Science and Technology,Tangshan 063210,China;Yisheng College/College of Iron&Steel Carbon Neutrality,North China University of Science and Technology,Tangshan 063210,China;Mine Green Intelligent Mining Technology Innovation Center of Hebei Province,Tangshan 063210,China)
出处
《中国矿业》
北大核心
2025年第S1期373-378,共6页
China Mining Magazine
基金
国家自然科学基金项目资助(编号:52474098)
河北省教育厅科技项目资助(编号:QN2024243)
大学生创新创业训练计划项目资助(编号:202410081076)。
关键词
加锚
板裂化
临界慢化
声发射
锚索轴力
anchoring
plate-cracking
critical slowing-down
acoustic emission
anchor cable axial force
