三轴压缩下含瓦斯煤样破坏过程的声发射特性  

Study of acoustic emission characteristics of coal containing gas under triaxial compression

作　　者：肖福坤[1] 樊慧强[1] 刘刚[1] 孟祥廪 

机构地区：[1]黑龙江省煤矿深部开采地压控制与瓦斯治理重点实验室(黑龙江科技学院),哈尔滨150027 [2]吉林省金力实验技术有限公司,长春130012

出　　处：《黑龙江科技学院学报》2013年第1期10-15,共6页Journal of Heilongjiang Institute of Science and Technology

基　　金：教育部科学技术研究重点项目(210064)

摘　　要：为找到含瓦斯煤样破坏过程与声发射特性之间的关系,以曾经发生过煤与瓦斯突出事故且依然存在突出危险的煤样为研究对象,对其在饱和瓦斯、不同瓦斯压力和不同围压作用下的声发射特性进行研究。结果表明:含饱和瓦斯煤样随着破坏程度的加剧声发射事件振幅增多且增大,声发射事件撞击数呈增长趋势,声发射事件能量增加;随着瓦斯压力的增加,煤样破坏过程中的AE事件的幅值减小、AE事件撞击的总数减少、AE事件的平均能量降低;随着围压的增加,AE事件的幅值呈现减小、能量呈现上升、撞击数呈减少的趋势。该结论可以为预测煤与瓦斯突出提供参考。Aimed at identifying the relationship between the failure process of the gas-containing coal samples and the characteristics of acoustic emission, this paper builds on the study of coal samples still vulnerable to prominent dangers following coal and gas outburst and describes a study of characteristics of acoustic emission, acted on by pressure of saturated gas and different gas and confining pressure. The exper- imental results suggest that saturated gas-containing coal samples shows an increasing amplitude of acoustic emission events along with the increasing degree of damage, accompanied by an increasingly greater impact number and energy of acoustic emission events. The increase of gas pressure is followed by reduction in the amplitude of AE events in damaging process of coal samples, in the total number of AE events impact, and in the average energy of acoustic emission. Along with the increase of confining pressure comes decrease in the amplitude of the AE event, rising trend in its energy, and decreasing trend in acoustic emission events number. This conclusion serves as a reference for prediction of gas and coal outburst.

关 键 词：瓦斯煤样 声发射撞击 声发射能量 声发射幅值 

分 类 号：TD315[矿业工程—矿井建设]