摘要
为研究Talbol级配下矸石压缩过程中破碎变形特征及声发射响应规律,采用岩石力学伺服液压试验系统与声发射监测系统,开展了Talbol指数(n=0.2,n=0.5,n=0.8)和轴向应力(2.5、5.0、7.5、10.0 MPa)影响下矸石侧限压缩试验。研究了矸石压缩变形破坏与粒径分形特征,建立了矸石应力应变与AE事件、AE能量等声发射参数之间的关系。实验结果表明:n=0.5时,Talbol级配理论公式符合W.B.Fuller理论理想公式,矸石体系具有最大干密度,抵抗变形能力较强;同一轴向应力下,前期小颗粒粒径占比大,抵抗变形能力较强,Talbol指数n由0.2增大至0.8,矸石分形维数D由2.82减小至2.41,矸石体系较稳定,不易发生破碎;具有连续性小粒径级配的矸石体系具有较好的压实特性,能量—应变曲线呈相关系数达0.99以上的y=ax关系模型,矸石声发射能量分布形式的阶段性变化与前期研究相比,显著性较低。
To study the crushing deformation characteristics and acoustic emission response law of gangue under Talbol gradation during compression,the rock mechanics servo-hydraulic test system and acoustic emission monitoring system were used to carry out the confined compression test of gangue under the influence of the Talbol index(n=0.2,n=0.5,n=0.8)and axial stress(2.5,5.0,7.5,10.0 MPa).The compression deformation failure and particle size fractal characteristics of gangue were studied in experiments.The relationship between the stress-strain of gangue and acoustic emission parameters such as AE events and AE energy was established.The experimental results show that:when n=0.5,the Talbol gradation theory formula is W.B.Fuller ideal theory formula,the gangue system has the maximum dry density and strong resistance to deformation;under the same axial stress,the small particle size occupies a large proportion in the early stage,and the resistance to deformation is strong,the Talbol index n increases from 0.2 to 0.8,and the fractal dimension D of gangue decreases from 2.82 to 2.41,the gangue system is stable and not easy to be broken;the gangue system with continuous small particle size gradation has good compaction characteristics,the strain-energy curve shows a linear function y=ax relationship model,and the correlation coefficient is above 0.99,the periodic change of the acoustic emission energy distribution form of gangue is lower than that of the previous research.
作者
罗肖龙
何祥
杨科
尹满
何淑欣
文志强
LUO Xiaolong;HE Xiang;YANG Ke;YIN Man;HE Shuxin;WEN Zhiqiang(College of Mining Engineering,Anhui University of Science and Technology,Huainan 232001,China;Institute of Energy(Anhui Energy Laboratory),Hefei Comprehensive National Science Center,Hefei 230031,China;Safety Supervision Bureau of China Coal Xinji Energy Co.,Ltd.,Huainan 232001,China)
出处
《煤炭技术》
CAS
北大核心
2023年第12期27-31,共5页
Coal Technology
基金
国家自然科学基金重点项目(52130402)
国家重点研发计划专项资助项目(2019YFC1904304)
安徽理工大学高层次引进人才科研启动基金(2021yjrc11)。
关键词
矸石压缩
Talbol级配
声发射
分形维数
gangue compression
Talbol grading
acoustic emission
fractal dimension
