Abstract Accurate calculation of the amounts of lost gas from coal are of great importance in underground mining. In this study, the effects of pore structure and the gas diffusion properties on the lost gas from tectonic and intact coals were investigated by the mercury intrusion porosimetry method (MIP), N2 (77 K) and CO2 (273 K) adsorption methods, and gas adsorption equilibrium/desorption tests. The results indicated that mesopore and macropore volumes increased after tectonic damage, as did the specific surface areas (SSA) and porosities. However, there was little change for the micropore volumes. Additionally, the desorption experiments indicated that the initial desorption and gas flow capacities of tectonic coal were greater than those of intact coal. Both laboratory and field results demonstrate that there is more higher lost gas for tectonic coal, which is directly influenced by the developed mesopore and macropore structure and by the initial gas desorption capacity. The logarithmic function method is a relatively better choice. When the gas content is determined in coal mines, the sampling exposure times should be kept as short as possible. From the perspective of engineering, this study provides a reference for the calculation of lost gas in tectonic coals.

中文翻译：

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构造煤和完整煤的孔隙结构特征和气体扩散特性：对失气计算的影响

摘要 准确计算煤的瓦斯损失量在地下开采中具有重要意义。在本研究中，通过压汞孔隙率法 (MIP)、N2 (77 K) 和 CO2 (273 K) 吸附方法研究了孔隙结构和气体扩散特性对构造煤和完整煤损失气的影响，以及气体吸附平衡/解吸测试。结果表明，构造破坏后中孔和大孔体积增加，比表面积 (SSA) 和孔隙度也增加。然而，微孔体积几乎没有变化。此外，解吸实验表明构造煤的初始解吸能力和气体流动能力大于完整煤的初始解吸能力和气体流动能力。实验室和现场结果表明，构造煤具有更高的损失气体，这直接受发达的中孔和大孔结构以及初始气体解吸能力的影响。对数函数法是相对较好的选择。煤矿瓦斯含量测定时，采样暴露时间应尽可能短。本研究从工程角度为构造煤中的失气计算提供了参考。