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. DOI: 10.13374/j.issn2095-9389.2023.09.15.001
引用本文: 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. DOI: 10.13374/j.issn2095-9389.2023.09.15.001
ZHENG Yuanxiang, DU Xianjie, FENG Guorui, JU Feng, LI Xiaolei, WANG Guanghui. Uniaxial compression damage evolution of gangue-cemented backfill columns with different height–diameter ratios based on acoustic emission characteristics[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2023.09.15.001
Citation: ZHENG Yuanxiang, DU Xianjie, FENG Guorui, JU Feng, LI Xiaolei, WANG Guanghui. Uniaxial compression damage evolution of gangue-cemented backfill columns with different height–diameter ratios based on acoustic emission characteristics[J]. Chinese Journal of Engineering. 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: 为研究高径比对矸石胶结充填柱单轴压缩性能的影响,本实验制备了高径比为0.5~4.0的5组圆柱体试件进行单轴压缩试验,同时利用数字图像相关技术(DIC)和声发射进行监测,探讨了不同高径比充填柱的破坏特征. 研究表明:矸石胶结充填柱的峰值应力和峰值应变都会随着高径比的增大而减小,并与高径比呈指数关系;充填柱的破坏形式在高径比大于2.0后从整体破坏转为局部破坏,局部应变大于16%可以导致充填柱整体失稳;充填柱的高径比从1.0升高到4.0,损伤程度下降到11%;充填柱在累计振铃计数快速上升区中的破坏占总破坏的比例随高径比的增大从22.6%增加到72.3%,高径比大于2.0时该比例达到40.9%且上升速度加快,破坏的集中程度较高;声发射最终累积振铃计数先随着高径比增大而增大,在高径比为2.0以后开始减小,且高径比对振铃集中出现的位置有较大影响;用声发射能量与振铃计数的比值(E/C)反应能量释放剧烈程度,平均E/C随高径比增大从1.26增大到2.76,高径比大于2.0时峰后能量释放较为剧烈. 试验结果可以为结构充填开采中充填柱高径比的选取提供参考.

     

    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.

     

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