煤岩体岩爆模拟试验中声发射时频演化规律分析  

Analysis of Time Frequency Evolution of Acoustic Emission during Coal Rockburst Simulation Test

作　　者：赵菲[1] 王洪建[1] 袁广祥[1] 任富强[2] 

机构地区：[1]华北水利水电大学资源与环境学院,河南郑州450045 [2]中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室,北京100083

出　　处：《华北水利水电大学学报（自然科学版）》2017年第5期82-87,共6页Journal of North China University of Water Resources and Electric Power：Natural Science Edition

基　　金：国家自然科学基金资助项目(41402269);深部岩石力学与地下工程国家重点实验室开放基金项目(SKLGDUEK1524);华北水利水电大学高层次人才启动经费资助项目(40583;40467);河南省高等学校重点科研项目(18A170008)

摘　　要：为了研究深部煤炭开采过程中煤岩体岩爆破坏过程声发射随应力演化的特性,对鹤岗矿区南山煤矿软岩巷道的煤岩体进行真三轴卸载岩爆试验,实时记录三向应力演化过程,并采集试验过程中的声发射信号进行参数和波形时频分析。结果表明:南山矿煤岩体岩爆临界破坏强度为17.8 MPa,是其单轴破坏强度的1.19倍,声发射累计释放能量达到(1.83E+5)mv·ms。采用快速傅里叶变换,对选取的加载和卸载岩爆典型阶段声发射数据进行波形分析,得到频率-幅值密度分布。发现加载阶段破裂源相似,产生的信号特征较为接近,都是低幅值、低频率的,而煤爆时产生高频、高幅和低频、高幅多种成分的破裂源,预示着能量在不断地加大。In order to investigate acoustic emission（ AE） features of coal rockburst with stress during deep mining process,the true traxial unloading test was performed on coal sample cored from Hegang Nanshan Coal Mine. During the test,the evolution process of three-dimensional stress was recorded in real time,and both of parameter and time-frequency analysis were conducted to process the acoustic emission waveform signals. The obtained results indicate that Nanshan coal sample has the critical burst failure strength of17. 8 MPa which is 1. 19 times of its uniaxial compression strength and the total AE energy reaches（ 1. 83 E ＋ 5） mv·ms. Singles generated from typical loading stages and unloading stage as well as final burst time were extracted and processed by Fast Fourier Transform（ FFT） to get density distribution of frequency-amplitude. It can be clearly observed that similar rupture sources generate at the initial loading stages with signals of low frequency and low amplitude. However,at the coal burst time,AE signals of both high and low frequency and high amplitude appear in the rock which indicates complex rupture sources and large energy release continually.

关 键 词：岩爆试验 声发射特性 能量 时频演化 

分 类 号：TV223.1[水利工程—水工结构工程] TU45[建筑科学—岩土工程]