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| 煤矿采空区—上隅角O2/CO/CO2运移积聚规律数值模拟研究 |
| Numerical Simulation Study on Migration and Accumulation Laws of O2/CO/CO2 in Coal Mine Goaf and Upper Corner |
| 投稿时间：2025-12-05 修订日期：2026-01-14 |
| DOI： |
| 中文关键词: 上隅角 有毒有害气体 气体运移 数值模拟 |
| 英文关键词: Upper corner Toxic and harmful gases Gas migration Numerical simulation |
| 基金项目:国家重点研发计划(2021YFC3100304)；陕西省科技成果转化引导专项计划(202404021301020)；中央高校基本科研业务费(2023KYJD1002) |
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| 中文摘要: |
| 针对我国西部浅埋煤层高强度开采下工作面上隅角有毒有害气体超限的突出问题，以柠条塔煤矿S1233工作面为工程背景，通过COMSOL数值模拟的方法，系统研究了上隅角有毒有害气体（以CO为主）的来源与多组分气体运移与积聚规律。结果表明:构建的采空区动态推进气体运移模型可以匹配现场数据，模拟结果显示采空区温度及有毒有害气体浓度随推进距离的增加而升高。CO/CO2向采空区深部积聚且部分随回风涌向上隅角，分析表明，遗煤厚度增加显著加剧氧化，2 m的遗煤厚度下CO最大涌出量是1 m的2.6倍；增大采高可有效降低采空区最高温度，7m采高时温度较5m采高降低约28℃，并能减少CO/CO?涌出量；送风量增加会扩大氧化带宽度并提升气体涌出量。 |
| 英文摘要: |
| Aiming at the prominent problem of excessive toxic and harmful gases in the upper corner of the working face under high-intensity mining of shallow coal seams in western China, this study takes the S1233 working face of Ningtiaota Coal Mine as the engineering background. Using the COMSOL numerical simulation method, it systematically investigates the sources of toxic and harmful gases (mainly CO) in the upper corner, as well as the laws of multi-component gas migration and accumulation. The results show that the constructed dynamic advancement gas migration model of the goaf can match the field data. The simulation results indicate that the temperature and concentration of toxic and harmful gases in the goaf increase with the increase of advancement distance. CO and CO2 accumulate in the deep part of the goaf, and part of them surge into the upper corner with the return air. Analysis shows that the increase in remaining coal thickness significantly intensifies oxidation—the maximum CO emission under 2 m remaining coal thickness is 2.6 times that under 1 m. Increasing the mining height can effectively reduce the maximum temperature of the goaf: the temperature at 7 m mining height is about 28℃ lower than that at 5 m, and it can reduce the emission of CO and CO2. An increase in air supply volume expands the width of the oxidation zone and increases gas emission. |
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