| 余陶,周荣升,胡敏.保护层卸压开采回风隅角瓦斯浓度动态演化规律研究[J].安徽建筑大学学报,2025,33(6):15-20，45 |
| 保护层卸压开采回风隅角瓦斯浓度动态演化规律研究 |
| Study on the Dynamic Evolution Law of Gas Concentration in the Corner of Return Air in Pressure Relief Mining with Protective Layer |
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| DOI： |
| 中文关键词: 推进距离 推进速度 综合抽采 数值模拟 |
| 英文关键词: advance distance advance speed comprehensive extraction numerical simulation |
| 基金项目:安徽省高校省级自然科学研究项目（2022AH050253） |
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| 中文摘要: |
| 回风隅角瓦斯浓度是采煤工作面安全开采的核心监控指标，其动态演化规律受推进速度、推进距离和瓦斯抽采的共同影响。本文以朱集东煤矿11-2煤保护层卸压开采工作面为对象，基于工作面推进速度、推进距离构建了采空区变渗透率模型，模拟研究了抽采与不抽采条件下回风隅角瓦斯浓度变化规律，确定了指数衰减型动态演化关系式。研究发现抽采能力匹配工作面瓦斯涌出时，推进速度和推进距离对回风隅角瓦斯浓度影响较小，推进速度的影响小于推进距离。现场实测验证了地面钻井和顶板定向长钻孔抽采条件下，风量2 050 m3/min、平均推进速度5.6 m/d时，回风隅角的瓦斯浓度稳定在0.32%以下，为类似条件工作面瓦斯治理提供依据。 |
| 英文摘要: |
| The gas concentration at the return air corner is a critical monitoring indicator for safe coal mining. Its dynamic evolution is influenced by the advancement speed, distance, and gas extraction. This study focuses on the 11-2 coal protection layer unloading mining face at Zhuji East Coal Mine, constructing a variable permeability model for the mined-out area based on the advancement speed and distance. The study simulates the changes in gas concentration at the return air corner under conditions of gas extraction and non-extraction, determining an exponential decay dynamic evolution relationship. The findings indicate that when the gas extraction capacity matches the gas outflow from the face, the advancement speed and distance have a lesser impact on the gas concentration at the return air corner, with the advancement speed having a smaller effect than the distance. Field measurements confirm that under conditions of ground drilling and roof directional long borehole gas extraction, with a wind volume of 2 050 m3 /min and an average advancement speed of 5.6 m/d, the gas concentration at the return air corner remains below 0.32%, providing a basis for gas control in similar working faces. |
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