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不同围压下煤岩声发射特征试验
引用本文:曹树刚,刘延保,李勇,张立强.不同围压下煤岩声发射特征试验[J].重庆大学学报(自然科学版),2009,32(11):1321-1327.
作者姓名:曹树刚  刘延保  李勇  张立强
作者单位:曹树刚,李勇,张立强,CAO Shu-gang,LI Yong,ZHANG Li-qiang(重庆大学西南资源开发及环境灾害控制工程教育部重点实验室,重庆,400030);刘延保,LIU Yan-bao(重庆大学西南资源开发及环境灾害控制工程教育部重点实验室,重庆400030;煤炭科学研究总院重庆研究院,重庆400037) 
摘    要:利用MTS815岩石力学试验系统对煤岩试样进行常规单轴和三轴围压下的声发射(AE)试验.对声发射信号特征进行综合分析,结果表明:常规单轴压缩和围压作用下试样的AE参数变化均具有明显的趋势性;围压的作用下,弹性阶段的声发射信号显著减少,破坏前无明显AE相对平静期现象,随时间分布的AE振幅及其包络线可以间接反映应力的变化趋势.随着振幅的增加,声发射事件数呈递减的趋势,反映累积幅度分布的m值随着围压的增加而增大.AE频率均分布在3个频域范围内,试样破坏时AE主频成分所占比例显著增加.

关 键 词:岩石力学  煤岩  声发射  振幅  频率分布
收稿时间:6/1/2009 12:00:00 AM

Experimental study on acoustic emission characteristics of coal rock at different confining pressure
CAO Shu gang,LIU Yan bao,LI Yong and ZHANG Li qiang.Experimental study on acoustic emission characteristics of coal rock at different confining pressure[J].Journal of Chongqing University(Natural Science Edition),2009,32(11):1321-1327.
Authors:CAO Shu gang  LIU Yan bao  LI Yong and ZHANG Li qiang
Institution:CAO Shu-gang1,LIU Yan-bao1,2,LI Yong1,ZHANG Li-qiang1(1.Key Laboratory for the Exploitation of Southwestern Resources and the EnvironmentalDisaster Control Engineering,Ministry of Education,Chongqingg University,Chongqing 400030,P.R.China,2.Chongqing Research Institute,China Coal Research Institute,Chongqing 400037,P.R.China)
Abstract:This paper conducts experimental investigation on acoustic emission(AE) characteristics of coal rock at uniaxial and triaxial compression by MTS815 rock mechanics test system.The results show that the variation of AE has tendency effect at uniaxial compression and confining pressure experiments. We indicate that AE signal decreases significantly in the elastic stage,and the relatively quiet period of AE before the specimens failure is not obvious under confining pressure.The AE amplitude distribution with t...
Keywords:rock mechanics  coal rock  acoustic emission  amplitude  frequency distribution
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