不同应力速率下含水煤岩声发射信号特性

不同应力速率下含水煤岩声发射信号特性

(中国矿业大学信息与电气工程学院，江苏徐州      221116) 

关键词：煤岩；声发射技术；频谱特性；应力速率

中图分类号：TD74 文献标识码：A 

Abstract: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 stressrate is low,acoustic emission became less than before;while the stress rate is high,acoustic emission increases significantly in frequency and intensity. 

煤层底板突水一直是威胁矿井安全生产的重大问题．在煤矿开采过程中，煤层底板突水、淹井事故时有发生，严重影响煤矿的正常生产。特别是近些年来，矿井开采深度已达千米，这样矿井突水问题就显得更加突出[1]。研究表明，煤层底板突水的主要影响因素为煤层底板含水情况，水压以及底板隔水层厚度等等。目前对于矿井突水现象的预测已经有了初步的研究，比如利用神经网络对矿井突水进行预测[2]。但目前其预测的可靠程度与生产实际还有较大的差距。