摘要
采用数字化声发射系统,开展了单轴压缩条件下不同岩石损伤过程声发射实验,研究了岩石在单轴压缩过程中声发射活动与时间、载荷的相关关系,微观损伤及其扩展的机理。实验结果表明,在岩石微裂隙压密、微观损伤产生、扩展和破坏4个不同阶段,声发射事件表现出不同的分布特征,岩石声发射活动特性与所受载荷有较好的相关关系。通过对声发射事件率、事件时空分布特征、声发射波形特征等参数的变化规律研究,能有效预测岩石的破坏,为现场岩体破坏提供可靠的预测预报依据。
Through acoustic emission experiments on different rock specimens under the condition of uniaxial compression by the digital AE system,this paper studied the correlative relationship between acoustic emission with time and load in uniaxial compression,as well as microcosmic damage and its expanding mechanism.The results show that acoustic emission events appear different distribution characteristics in four stages of microfissure consolidation,as well as production,expansion and break in microcosmic damage,and the acoustic emission characteristics have good relationship with loads.Based on the researches of the changing regularities in acoustic emission activities parameters,such as frequency,space-time distribution characteristics,wave form characteristics etc,rock damage can be effectively predicted,which provides a reliable forecast basis for the failure of rock mass.
出处
《矿业研究与开发》
CAS
北大核心
2011年第6期56-59,共4页
Mining Research and Development
基金
国家高技术研究发展计划(863计划)项目(2008AA062104)
国家高技术研究发展计划(973计划)项目(2010CB735507)
关键词
岩石损伤
声发射
单轴压缩
波形识别
Rock damage
Acoustic emission
Uniaxial compression
Wave recognition
