Characterization of energy-driven damage mechanism and gas seepage in coal under mining-induced stress conditions

IF 7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL International Journal of Rock Mechanics and Mining Sciences Pub Date : 2024-07-31 DOI:10.1016/j.ijrmms.2024.105834
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Abstract

Gas seepage and progressive failure of coal are common energy-driven mining phenomena. A comprehensive understanding of the energy-driving mechanism behind the catastrophic behavior of mining-induced coal is fundamental to innovating the technology of coal and gas co-mining. Thus, this study simulated three typical mining stress evolution process in protective coal-seam mining (PCM), top-coal caving mining (TCM), and non-pillar mining (NM) to investigate the energy evolution and distribution patterns of coal. The results indicate a strong correlation between energy dissipation and gas seepage. By transitioning from PCM and TCM to NM, the peak elastic strain energy of gas-bearing coal increased by 155.92 %, and the ratio of peak dissipative energy decreased from 51 % to 41 %. Under the PCM stress path, gas seepage decreased the energy storage by 13.52 %, whereas the pre-mining pressure relief and enhanced permeability simulation increased in peak dissipation energy by 49.66 %. Using the cumulative dissipative energy as a damage variable reveals that the degree of coal damage evolution under PCM is higher than other mining methods. Based on the energy-driven damage mechanism, a new coal permeability model was established, and its comparison with classical permeability model demonstrated its excellent fitting effectiveness.

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采矿诱发应力条件下煤炭中能量驱动破坏机制和瓦斯渗流的表征
瓦斯渗漏和煤的渐进衰竭是常见的能量驱动开采现象。全面了解开采诱发煤炭灾难性行为背后的能量驱动机制,是创新煤与瓦斯共采技术的基础。因此,本研究模拟了保护煤层开采(PCM)、顶煤崩落开采(TCM)和非支柱开采(NM)三种典型的开采应力演化过程,以研究煤炭的能量演化和分布规律。结果表明,能量耗散与瓦斯渗流之间存在密切联系。从 PCM 和 TCM 过渡到 NM,含瓦斯煤的峰值弹性应变能增加了 155.92%,峰值耗散能比率从 51% 降至 41%。在 PCM 应力路径下,瓦斯渗流使储能减少了 13.52%,而开采前降压和强化渗透模拟使峰值耗散能增加了 49.66%。将累积耗散能作为破坏变量可以发现,PCM 下煤炭破坏演化程度高于其他开采方法。基于能量驱动的损伤机理,建立了新的煤炭透气性模型,并与经典透气性模型进行了对比,证明了其卓越的拟合效果。
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来源期刊
CiteScore
14.00
自引率
5.60%
发文量
196
审稿时长
18 weeks
期刊介绍: The International Journal of Rock Mechanics and Mining Sciences focuses on original research, new developments, site measurements, and case studies within the fields of rock mechanics and rock engineering. Serving as an international platform, it showcases high-quality papers addressing rock mechanics and the application of its principles and techniques in mining and civil engineering projects situated on or within rock masses. These projects encompass a wide range, including slopes, open-pit mines, quarries, shafts, tunnels, caverns, underground mines, metro systems, dams, hydro-electric stations, geothermal energy, petroleum engineering, and radioactive waste disposal. The journal welcomes submissions on various topics, with particular interest in theoretical advancements, analytical and numerical methods, rock testing, site investigation, and case studies.
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