Mechanical properties and energy evolutions of burst-prone coal samples with holes and fillings

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Science & Technology Pub Date : 2024-05-14 DOI:10.1007/s40789-024-00675-z
Yukai Fu, Yongzheng Wu, Junchen Li, Penghe Zhou, Zhuoyue Sun, Jie He
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Abstract

During the mining process of impact-prone coal seams, drilling pressure relief can reduce the impact propensity of the coal seam, but it also reduces the integrity and strength of the coal mass at the side of the roadway. Therefore, studying the mechanical properties and energy evolution rules of coal samples containing holes and filled structures has certain practical significance for achieving coordinated control of coal mine rockburst disasters and the stability of roadway surrounding rocks. To achieve this aim, seven types of burst-prone coal samples were prepared and subject to uniaxial compression experiments with the aid of a TAW-3000 electro-hydraulic servo testing machine. Besides, the stress–strain curves, acoustic emission signals, DIC strain fields and other data were collected during the experiments. Furthermore, the failure modes and energy evolutions of samples with varying drilled hole sizes and filling materials were analyzed. The results show that the indexes related to burst propensity of the drilled coal samples decline to some extent compared with those of the intact one, and the decline is positively corelated to the diameter of the drilled hole. After hole filling, the strain concentration degree around the drilled hole is lowered to a certain degree, and polyurethane filling has a more remarkable effect than cement filling. Meanwhile, hole filling can enhance the strength and deformation resistance of coal. Hole drilling can accelerate the release of accumulated elastic strain energy, turning the acoustic emission events from low-frequency and high-energy ones to high-frequency and low-energy ones, whereas hole filling can reduce the intensity of energy release. The experimental results and theoretical derivation demonstrate that hole filling promotes coal deformability and strength mainly by weakening stress concentration surrounding the drilled holes. Moreover, the fillings can achieve a better filling effect if their elastic modulus and Poisson’s ratio are closer to those of the coal body.

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带有孔洞和填充物的易爆煤样的力学性能和能量变化
在易冲击煤层的开采过程中,钻孔卸压可以降低煤层的冲击倾向性,但同时也会降低巷道边煤块的完整性和强度。因此,研究含孔及充填结构煤样的力学性能和能量演化规律,对实现煤矿岩爆灾害的协调控制和巷道围岩的稳定具有一定的现实意义。为此,我们制备了七种易爆煤样,并利用 TAW-3000 型电液伺服试验机进行了单轴压缩试验。此外,实验过程中还采集了应力-应变曲线、声发射信号、DIC 应变场等数据。此外,还分析了不同钻孔尺寸和填充材料样品的破坏模式和能量演变。结果表明,与完整煤样相比,钻孔煤样的爆破倾向相关指标有一定程度的下降,且下降幅度与钻孔直径成正相关。钻孔充填后,钻孔周围的应变集中度有一定程度的降低,聚氨酯充填比水泥充填效果更显著。同时,钻孔填充可以提高煤的强度和抗变形能力。钻孔可以加速累积的弹性应变能量的释放,使声波发射事件从低频高能转变为高频低能,而孔洞填充则可以降低能量释放的强度。实验结果和理论推导表明,孔填充主要通过削弱钻孔周围的应力集中来提高煤的变形能力和强度。此外,如果填充物的弹性模量和泊松比更接近煤体,则填充效果会更好。
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来源期刊
CiteScore
11.40
自引率
8.40%
发文量
678
审稿时长
12 weeks
期刊介绍: The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.
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