Shuozhou Maohua Bailu Coal Industry Co. , Ltd.
School of Safety and Environmental Engineering, Shandong University of Science and Technology

为研究近距离煤层开采对上部工作面煤柱破坏及氧化特性的影响,以白芦煤矿74201工作面为研究背景,基于数值模拟、实验研究等手段分析近距离煤层下部工作面开采对上部煤层煤柱塑性区域分布及氧化特性的影响。FLAC3D模拟结果表明,随4-2煤层推进,上部煤层煤柱破坏变形特征近似分为三个阶段:煤柱完整;煤柱变形破损,但保持基本连续性;煤柱大范围剪切破坏,煤柱破碎。程序升温实验表明,已发生一定破碎的煤柱,其二次氧化过程中CO及C2H4临界温度点均提前10~20℃,耗氧速率最高增大2573.1×10-11mol/(cm-3·s);完好煤柱未检测到C2H2,4-1碎裂煤柱及4-1破碎煤柱分别在250℃和240℃检测到C2H2气体,分析得出煤柱破碎过程对煤二次氧化进程具有一定的促进作用,破碎煤柱相对于完好煤柱更易发生自燃反应。本研究得出了上部煤层破碎失稳煤柱自然发火危险性随着下部煤层回采进行不断增大的结论。

In order to study the influence of contiguous seams mining on the damage and oxidation characteristics of coal pillar in the upper working face, taking the working face in Bailu Coal Mine as the research background, the influence of lower working face mining on the plastic distribution and oxidation characteristics of upper seam coal pillar was analyzed by the means of numerical simulation and experimental research. FLAC3D simulation results show that, with the advance of 4 coal seam, the failure and deformation characteristics of the upper seam coal pillar can be approximately divided into three stages: intact coal pillar, fractured coal pillar with basic continuity, and broken coal pillar with large scale shear failure. According to the temperature programmed test results, the critical temperature points of CO and C2H4 are 10~20 ℃ lower during the secondary oxidation process, and the maximum oxygen consumption rate is 2573. 1×10 mol/ (cm-3·s) higher; C2H2 is not detected in intact coal pillar, while that is detected in the fractured coal pillar and broken coal pillar at ℃ and ℃ , respectively, which indicate the crushing process of coal pillar promotes the secondary oxidation of coal, and the broken coal pillar is more prone to spontaneous combustion than the intact. Finally, it was concluded that, the risk of spontaneous combustion of the broken and unstable coal pillar in the upper coal seam increases with the lower coal seam mining.

付文刚,关洪峰,石勇,等.近距离煤层上部工作面煤柱破坏及氧化特性研究[J].煤炭工程,2024,56(4):67-72.