摘要
针对煤矿工程现场中动力灾害频发,灾害前兆信息难以预测的难题,通过室内试验,开展了不同岩性煤岩体材料声发射特征参数及破坏前兆信息的研究,揭示了不同岩性煤岩体破坏特征及声发射特征,并获得了其破坏前兆信息。结果表明:不同岩性煤岩体材料宏观破坏特征基本相似,但其破坏阶段、破坏过程和破坏特征呈现一定的差异;不同岩性煤岩体的声发射特征值大小不同,但演化规律整体上呈现一致性,具体表现为:压密阶段声发射呈"稳定增高"状态,弹性阶段声发射呈"稳定沉默"状态,弹塑性阶段声发射呈"急剧变化"状态;在弹塑性阶段,当达到应力峰值的过程中出现短暂的"声发射平静期",这显然与临界慢化理论相吻合,故将其定义为致灾"前兆信息点"。
Aiming at the frequent occurrence of dynamic disasters in coal mine engineering sites,the disaster precursor information is difficult to predict. Through the laboratory tests,studies have been conducted on the acoustic emission characteristics of different lithologic coal - rock materials,revealing the damage characteristics and acoustic emission characteristics of different lithologic coal-rock materials,and obtaining precursory information of rock destruction. The results show that the macroscopic damage characteristics of different lithologic coal - rock materials are basically similar,but the destructive stage,damage process and damage characteristics present a certain degree of differences; the acoustic emission eigenvalues of different lithologic coal-rock materials are different,but the evolution rules are roughly the same. The specific expression is that the acoustic emission in the compaction stage is“stable and increasing”. In the stress elastic phase,the acoustic emission is“stable silence”,and the acoustic emission in the stress elastoplastic stage is“rapid change”. In the process of reaching the critical point in the elastoplastic stage,the short-time“quiet period of acoustic emission”is presented, which is also consistent with the critical moderation theory and defines it as disaster“precursor information point”.
作者
李杨
袁安营
LI Yang;YUAN An-ying(China Energy Technology and Economics Research Institute,Beijing 100211,China;Anhui Province Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mine, Anhui University of Science and Technology,Huainan 232001,China)
出处
《煤炭工程》
北大核心
2018年第12期86-89,共4页
Coal Engineering
基金
国家自然科学基金资助项目(U1361208
51574008)
安徽省教育厅基金项目(KJ2018A0077)
关键词
煤岩体
破坏特征
声发射参数
前兆信息
coal and rock mass
damage characteristics
acoustic emission parameters
precursory information
