Numerical analysis on the factors affecting post-peak characteristics of coal under uniaxial compression

IF 6.9 1区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Science & Technology Pub Date : 2024-01-04 DOI:10.1007/s40789-023-00626-0
Zhiguo Lu, Wenjun Ju, Fuqiang Gao, Taotao Du
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Abstract

The post-peak characteristics of coal serve as a direct reflection of its failure process and are essential parameters for evaluating brittleness and bursting liability. Understanding the significant factors that influence post-peak characteristics can offer valuable insights for the prevention of coal bursts. In this study, the Synthetic Rock Mass method is employed to establish a numerical model, and the factors affecting coal post-peak characteristics are analyzed from four perspectives: coal matrix mechanical parameters, structural weak surface properties, height-to-width ratio, and loading rate. The research identifies four significant influencing factors: deformation modulus, density of discrete fracture networks, height-to-width ratio, and loading rate. The response and sensitivity of post-peak characteristics to single-factor and multi-factor interactions are assessed. The result suggested that feasible prevention and control measures for coal bursts can be formulated through four approaches: weakening the mechanical properties of coal pillars, increasing the number of structural weak surfaces in coal pillars, reducing the width of coal pillars, and optimizing mining and excavation speed. The efficacy of measures aimed at weakening the mechanical properties of coal is successfully demonstrated through a case study on coal burst prevention using large-diameter borehole drilling.

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单轴压缩条件下煤炭峰后特性影响因素的数值分析
煤炭的后峰值特征直接反映了其失效过程,是评估脆性和爆裂责任的重要参数。了解影响后峰值特征的重要因素可为预防煤炭爆裂提供有价值的见解。本研究采用合成岩体法建立数值模型,从煤基体力学参数、结构薄弱面特性、高宽比和加载速率四个方面分析了影响煤后峰特性的因素。研究发现了四个重要的影响因素:变形模量、离散断裂网络密度、高宽比和加载速率。评估了峰值后特性对单因素和多因素相互作用的响应和敏感性。结果表明,可通过削弱煤柱力学性能、增加煤柱结构薄弱面数量、减小煤柱宽度、优化开采和掘进速度等四种方法制定可行的煤爆防治措施。通过对使用大直径钻孔防止煤爆的案例研究,成功证明了旨在削弱煤炭机械性能的措施的有效性。
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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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