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Acoustic emission characteristics and damage evolution process of backfilling body–coal pillar–backfilling body composite structure
Bulletin of Engineering Geology and the Environment ( IF 4.2 ) Pub Date : 2022-07-06 , DOI: 10.1007/s10064-022-02779-9
Boqiang Cui, Guorui Feng, Jinwen Bai, Kai Wang, Xudong Shi, Haotian Wu

The stability of the backfilling body–coal pillar–backfilling body (BPB) composite structure in coal mines is of great significance for the rock strata control after backfilling along both sides of the coal pillars. Uniaxial compression tests were conducted on different BPB composite samples to explore their acoustic emission (AE) characteristics and damage evolution process. The results show that the strength of the BPB composite samples is lower than that of the backfilling body sample of the same size. When increasing the coal element width, the peak stress of the BPB composite samples gradually decreases, the stress–strain curve changes from a single peak to multiple peaks, and the AE events transition from a uniform distribution to a regional concentrated distribution. The concentrated areas of AE energy during BPB composite sample failure are mainly distributed in the coal elements, and the maximum AE energy values all appear on the coal elements. The reduction of the backfilling body element width in the BPB composite sample reduces its binding force on the coal element. Larger coal element widths are thus associated with poorer sample integrity after uniaxial compression. The study of the AE ringing count clarifies the relationship between the strain and damage variable during uniaxial compression. This study provides an important foundation for understanding the disaster evolution process of BPB composite structures.



中文翻译:

充填体-煤柱-充填体复合结构声发射特性及损伤演化过程

煤矿充填体-煤柱-充填体(BPB)复合结构的稳定性对煤柱两侧充填后的岩层控制具有重要意义。对不同的BPB复合材料样品进行单轴压缩试验,探索其声发射(AE)特性和损伤演化过程。结果表明,BPB复合试样的强度低于相同尺寸的回填体试样。随着煤元宽度的增加,BPB复合样品的峰值应力逐渐减小,应力-应变曲线由单峰变为多峰,AE事件由均匀分布转变为区域集中分布。BPB复合试样破坏时声发射能量的集中区域主要分布在煤元素上,最大声发射能量值都出现在煤元素上。BPB复合样品中回填体元素宽度的减小降低了其对煤元素的结合力。因此,较大的煤元素宽度与单轴压缩后较差的样品完整性有关。AE振铃计数的研究阐明了单轴压缩过程中应变和损伤变量之间的关系。本研究为理解BPB复合结构灾害演化过程提供了重要基础。BPB复合样品中回填体元素宽度的减小降低了其对煤元素的结合力。因此,较大的煤元素宽度与单轴压缩后较差的样品完整性有关。AE振铃计数的研究阐明了单轴压缩过程中应变和损伤变量之间的关系。本研究为理解BPB复合结构灾害演化过程提供了重要基础。BPB复合样品中回填体元素宽度的减小降低了其对煤元素的结合力。因此,较大的煤元素宽度与单轴压缩后较差的样品完整性有关。AE振铃计数的研究阐明了单轴压缩过程中应变和损伤变量之间的关系。本研究为理解BPB复合结构灾害演化过程提供了重要基础。

更新日期:2022-07-06
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