近距离煤层采空区气体分布特征及运移规律研究

张鹏明; 张玉龙; 王大鹏; 韩昌江; 王俊峰; 郝子靖; 周春山

近距离煤层采空区气体分布特征及运移规律研究

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出版历程
- 发布日期: 2023-01-19

Static and dynamic distribution characteristics and migration law of gas in goaf of short distance coal seams

摘要

摘要: 为了防治近距离煤层采空区有毒有害气体的涌出，研究其分布以及运移行为具有重要意义。以山西晋神沙坪煤矿1818工作面为例，布置束管监测系统，以人工采样的方法，获取采空区及工作面相等间隔测点气体成分及体积分数；通过研究下煤层实体煤采动前后上下煤层采空区气体在空间上的分布情况，分别得出上、下采空区气体在采空区前方90 m、后方180 m范围内静态、动态分布规律；基于上、下采空区气体时空分布特征，探讨了近距离煤层开采采空区气体的4个方面的运移机制。研究发现：在采动过程中，近距离采空区有毒有害气体受漏风扩散现象、上下采空区气体运移效应和煤氧反应等多重影响而呈现出向回风侧集聚的显著时空分布规律。
- 近距离煤层 /
- 气体防治 /
- 静态分布 /
- 动态分布 /
- 瓦斯运移规律
Abstract: In order to prevent and control the emission of toxic and harmful gases in the goaf of close coal seams, it is of great significance to study its distribution and migration behavior. Taking 1818 working face of Jinshen Shaping Coal Mine in Shanxi Province as an example, the gas composition and volume fraction of equal interval measuring points in goaf and working face are obtained by arranging beam tube monitoring system and manual sampling method. By studying the spatial distribution of the gas in the upper and lower coal seams before and after the solid coal mining of the lower coal seam, the static and dynamic distribution laws of the gas in the upper and lower goafs within the range of 90 m in front of the goaf and 180 m behind the goaf are obtained respectively. Based on the spatial and temporal distribution characteristics of the gas in the upper and lower goafs, the four aspects of the migration mechanism of the gas in the goaf of the close-distance coal seam mining are discussed. It is found that during the mining process, the toxic and harmful gases in the close-distance goaf show a significant spatial and temporal distribution law of agglomeration to the return air side due to the multiple effects of air leakage diffusion, gas migration effect in the upper and lower goaf and coal-oxygen reaction.
- close coal seams /
- gas prevention and control /
- static distribution /
- dynamic distribution /
- gas migration law

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