不同应力速率下含水煤岩声发射信号特性  

Study of Acoustic Emission Signal Characteristic of Water-Containing Coal and Rock Under Different Stress Rates

作　　者：童敏明[1] 胡俊立[1] 唐守锋[1] 戴新联[1] 

机构地区：[1]中国矿业大学信息与电气工程学院,江苏徐州221116

出　　处：《采矿与安全工程学报》2009年第1期97-100,共4页Journal of Mining & Safety Engineering

基　　金：教育部科技创新工程重大项目培育资金项目(706029);国家重点基础研究发展计划(973)项目(2007CB209407)

摘　　要：对不同应力速率下含水煤岩声发射频谱特性进行了实验和分析.结果表明,在煤岩的受载变形破裂过程中声发射是阵发性的,其声发射的频率特性较为单一.煤岩含水量的不同,对其声发射特性有一定影响.具体表现为对声发射强度的影响.含水量较大的煤岩较之含水量小的在声发射强度上略低.应力速率大时,声发射主要集中在煤岩破裂前的一段时间内;应力速率小时,煤岩破裂前的声发射较应力速率大时变少.在应力速率提高后,声发射在频次和幅度上有很明显的增加.This paper analyzes acoustic emission spectrum of water-containing coal and rock under different stress rates through the experiment.The result shows that the acoustic emission of such coal and rock is paroxysmal in the process of deformation and fracture and its acoustic emission is simple.Different water content of coal and rock are different in acoustic emission characteristic,mainly in the effect on acoustic emission intensity.The more water the coal and rock contain,the lower acoustic emission intensity it will have.When the stress rate is high,acoustic emission mainly takes place before the coal and rock become ruptured;when the stress rate is low,acoustic emission became less than before;while the stress rate is high,acoustic emission increases significantly in frequency and intensity.

关 键 词：煤岩 声发射技术 频谱特性 应力速率 

分 类 号：TD74[矿业工程—矿井通风与安全]