工程科学学报2024，Vol.46Issue(8)：1370-1380,11.DOI:10.13374/j.issn2095-9389.2023.09.15.001
基于声发射特征的不同高径比矸石胶结充填柱单轴压缩损伤演化
Uniaxial compression damage evolution of gangue-cemented backfill columns with different height-diameter ratios based on acoustic emission characteristics
摘要
Abstract
To study the effect of height-diameter ratio on the uniaxial compression performance of gangue-cemented backfill columns,five groups of cylindrical specimens with height-diameter ratios of 0.5,1.0,2.0,3.0,and 4.0 were prepared for uniaxial compression tests.At the same time,digital image correlation technology and acoustic emission were used for monitoring,and the stress curve,strain curve,apparent strain,acoustic emission ringing,energy,and impact number of the backfill column were recorded.The obtained data were processed and corresponded with each other with time to explore the failure characteristics of different height-diameter ratio backfill bodies.The results show that the peak stress and peak strain of gangue-cemented backfill decrease exponentially with increasing height-diameter ratio.The failure form of the backfill column changes from global failure to local failure when the height-diameter ratio is greater than 2.0,and a local strain of more than 16%can lead to the overall instability of the backfill column.When the height-to-diameter ratio of the backfill column increased from 1.0 to 4.0,the damage degree for the backfill column decreased to 11%.The proportion of damage of backfill bodies in the cumulative ringing count rapid rise region increased from 22.6%to 72.3%with increasing height-diameter ratio and reached 40.9%when the height-diameter ratio was greater than 2.0.The rising speed accelerated,and the concentration of damage was higher.The final cumulative ringing count of acoustic emission reached a maximum at a height-diameter ratio of 2.0,and the position of ringing concentration was greatly influenced by this ratio.The ratio of acoustic emission energy-to-ringing count(E/C)reacts to the intensity of energy release.The average E/C increases from 1.26 to 2.76 with increasing height-diameter ratio.Before the peak stress,the rising speed of E/C decreases above a height-diameter ratio of 2.0,and after the peak stress,the E/C rises faster above a height-diameter ratio of 2.0.Before the peak stress,the intensity of the failure of the backfill column reaches a maximum when the height-diameter ratio is 3.0,and after the peak stress,the failure process is more violent for the backfill column with a height-diameter ratio greater than 2.0.The test results provide a reference for selecting the height-diameter ratio of the backfill column in structural backfill mining.关键词
矸石胶结充填柱/高径比/表观应变/累计振铃计数/声发射能量Key words
cemented gangue backfill column/height-diameter ratios/apparent strain/cumulative ring count/acoustic emission energy分类
矿业与冶金引用本文复制引用
郑远翔,杜献杰,冯国瑞,巨峰,李晓磊,王广辉..基于声发射特征的不同高径比矸石胶结充填柱单轴压缩损伤演化[J].工程科学学报,2024,46(8):1370-1380,11.基金项目
国家自然科学基金资助项目(52004173,51925402,52334005) （52004173,51925402,52334005）
山西浙大新材料与化工研究院科研项目(2022SX-TD008,2021SX-TD001) （2022SX-TD008,2021SX-TD001）
中国博士后科学基金(2022M712922) （2022M712922）
山西省科技重大专项项目(20201102004) （20201102004）
