郑远翔, 杜献杰(通讯作者), 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研究[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(通讯作者), 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研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2023.09.15.001
Study on uniaxial compression damage evolution of gangue cemented backfill column with different high diameter ratio based on acoustic emission characteristics[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2023.09.15.001
Citation: Study on uniaxial compression damage evolution of gangue cemented backfill column with different high diameter ratio 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研究

Study on uniaxial compression damage evolution of gangue cemented backfill column with different high diameter ratio based on acoustic emission characteristics

  • 摘要: 为研究高径比对矸石胶结充填体单轴压缩性能的影响,本实验制备了高径比为0.5~4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体的破坏特征。研究表明:矸石胶结充填体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;充填体的破坏形式在高径比大于2后从整体破坏转为局部破坏,局部应变大于16%可以导致充填体整体失稳;充填体的高径比从1升高到4,损伤程度下降到11%;充填体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体高径比的选取提供参考。

     

    Abstract: In order to study the effect of high diameter ratio on the uniaxial compression performance of gangue cemented backfill body, five groups of cylindrical specimens with high diameter ratio of 0.5, 1, 2, 3 and 4 were prepared for uniaxial compression test, and at the same time, digital image correlation technology (DIC) and acoustic emission were used to monitor, and the stress curve, strain curve, apparent strain, acoustic emission ringing, energy and impact number of the backfill body were recorded, and the obtained data were processed and corresponded with each other with time, so as to explore the failure characteristics of different high diameter ratio backfill bodies. The results show that the peak stress and peak strain of gangue cemented backfill will decrease with the increase of the high diameter ratio, and have an exponential relationship with the high diameter ratio. The failure form of the backfill body changes from global failure to local failure after the high diameter ratio is greater than 2, and the local strain of more than 16% can lead to the overall instability of the backfill body. When the height to diameter ratio of the backfill body increased from 1 to 4, the damage degree for backfill body 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 the increase of the high diameter ratio, and the proportion reached 40.9% when the high diameter ratio was greater than 2, and the rising speed accelerated, and the concentration of damage was higher. the final cumulative ringing count of acoustic emission increases with the increase of the high diameter ratio at first, then begins to decrease after the high diameter ratio is 2, and the high diameter ratio has a great influence on the position of ringing concentration. 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 the increase of the high diameter ratio, the rising speed of E/C before the peak stress begins to decrease after the high diameter ratio is greater than 2, and after the peak stress, the E/C rises faster after the high diameter ratio and the high diameter ratio is greater than 2. There is an upper limit to the intensity of the failure of the backfill body before the peak stress, which reaches the maximum when the high diameter ratio is 3, and the failure process of the backfill body with the high diameter ratio greater than 2 is more violent after the peak stress. The test results can provide a reference for the selection of the high-diameter ratio of the backfill body in structural backfill mining.

     

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