摘要
为完善冲击地压灾害预测判据,通过试验研究煤、岩石和组合煤岩3类试样的声发射(AE)特性及冲击倾向性规律。结果表明:组合结构中的岩体对煤体的力学性质和冲击倾向性有显著影响。试样的载荷-冲击倾向-声信号变化具有一致性,随着冲击倾向从弱至强变化,AE信号分布呈密集连续-脉冲连续-瞬时脉冲的特征。分析大量不同冲击倾向性试样的AE量化数据发现,试样冲击倾向性越强,其峰后AE振铃计数和能量变化率越高,由此可将峰后AE振铃计数和能量变化率作为冲击倾向性判据。
In order to improve the prediction criterion of coal burst, both the outburst-proneness and the AE characteristic were studied experimentally for coal,rock and coal-rock combinations. The results show that the rock of the combined structure has a significant impact on the mechanical properties and the outburstproneness of coal mass, that there is similarity between change in stress, that in outburst-proneness and that in AE-signals of coal-rock, with the outburst-proneness changes from weak to strong, AE-signals show the character of dense continuous, continuous pulse and instantaneous pulse. Analysis of the AE quantitative data on different outburst-proneness samples indicates that the stronger impact tendency of sample, the higher the change rate of both the stress post-peak AE counts and energy will be, and that the change rate of the stress post-peak AE counts and that of energy can be used as the criteria for assessing the outburst-proneness.
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2016年第4期102-107,共6页
China Safety Science Journal
基金
国家自然科学基金面上项目资助(51374123
11172121)
国家自然科学基金青年科学基金资助(51504122)
2014年辽宁省优秀人才支持计划(LJQ2014043)
关键词
声发射(AE)
组合煤岩
力学性质
冲击倾向性
振铃计数变化率
能量变化率
acoustic emission（AE）
coal-rock combinations
mechanical properties
outburst-proneness
ringing count rate
energy change rate
