Mechanical responses and fracturing behaviors of coal under complex normal and shear stresses, Part I: Experimental results

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Science & Technology Pub Date : 2024-07-17 DOI:10.1007/s40789-024-00705-w
Z. Y. Song, W. G. Dang, Z. C. Bai, Y. Zhao, P. T. Wang, Z. Yang
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Abstract

This work presents experimental tests based on coal collected from a coal mine based underground water reservoir (CMUWR). The mechanical responses of dry and water-soaked coal samples under the complex normal and shear stresses under multi-amplitude and variable frequency is investigated. The experimental results reveal the effects of stress path, water soaking and frequency on deformation, energy dissipation, secant modulus and shear failure surface roughness. The experimental results show that when normal and shear stresses are applied simultaneously, there is a significant competitive relationship between them. On the dominant side, the strain rate will be significantly increased. The sample under a loading frequency of 0.2 Hz exhibits a longer fatigue life. During the cyclic shear test, the shear strain of the water-soaked sample is higher than that of the dry samples. The average roughness coefficient of failure surface exhibits an increasing pattern with increase in shear strength, the elevated roughness of a shear surface is advantageous in constraining shear displacements of specimens, thereby lowering the energy dissipation. This study can provide theoretical and practical implications for a long-term safety evaluation of CMUWR.

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复杂法向应力和剪切应力下煤的机械响应和断裂行为,第一部分:实验结果
本研究介绍了基于煤矿地下水库(CMUWR)采集的煤炭进行的实验测试。研究了干燥和浸水煤样在多振幅、变频率的复杂法向应力和剪切应力作用下的力学响应。实验结果揭示了应力路径、水浸泡和频率对变形、能量耗散、正弦模量和剪切破坏表面粗糙度的影响。实验结果表明,当同时施加法向应力和剪切应力时,它们之间存在明显的竞争关系。在占优势的一方,应变率会明显增加。加载频率为 0.2 Hz 的样品具有更长的疲劳寿命。在循环剪切试验中,浸水样品的剪切应变高于干燥样品。破坏表面的平均粗糙度系数随剪切强度的增加而增加,剪切表面粗糙度的增加有利于限制试样的剪切位移,从而降低能量耗散。这项研究可为 CMUWR 的长期安全评估提供理论和实践意义。
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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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