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| 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 |
| 投稿时间：2025-06-05 修订日期：2025-06-23 |
| 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: promote distance promote 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,建立了采空区渗透率动态变化模型,确定了指数衰减型的回风隅角瓦斯浓度动态演化关系式。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下,风量2050m3/min、平均推进速度5.6m/d时回风隅角的瓦斯浓度,为确保类似条件工作面安全高效生产提供依据。 |
| 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 of Zhuji East Coal Mine, establishing a dynamic change model for the permeability of the mined-out area and determining an exponential decay relationship for the dynamic evolution of gas concentration at the return air corner. The research found 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 confirmed that under conditions of ground drilling and roof directional long borehole gas extraction, with an air volume of 2050m3/min and an average advancement speed of 5.6m/d, the gas concentration at the return air corner provides a basis for ensuring safe and efficient production in similar working faces.. |
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