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以一种散碎煤瓦斯涌出规律模拟试验装置为主要研究设备,以厚煤层的瓦斯放散规律为模拟研究对象,以探究厚煤层工作面采掘空间瓦斯来源为主要目的,对厚煤层的瓦斯放散规律、瓦斯压力对厚煤层瓦斯放散特性规律进行了模拟试验研究。结果表明:微结构的参与明显改变了厚煤层的瓦斯放散规律,导致其表现出明显的瓦斯放散速度急剧减小段、似指数关系、缓慢减小段的3阶段特性;厚煤层瓦斯放散规律曲线表现出的规律和厚煤层瓦斯的绝对放散量没有随瓦斯压力的改变产生明显变化,而瓦斯压力产生的影响主要表现在瓦斯放散速度的数值大小方面;瓦斯压力固定时,厚煤层工作面采掘空间在揭露新煤壁瞬间时的瓦斯浓度激增是由煤壁涌出瓦斯主导的;而在揭露新煤壁一段时间后,煤壁涌出瓦斯是采掘空间内的瓦斯浓度增加的主要原因;瓦斯压力不同的条件下,进行厚煤层采掘空间瓦斯来源分析时,不仅需要根据煤壁揭露的时间长短,还需依据工作面的瓦斯压力做出判断。
Taking a kind of scattered gas emission law simulation test device as the main research equipment and the law of gas emission from thick coal seam as the research object, the main purpose of this paper is to explore the gas source of the mining space in thick coal seam. Regularity and gas pressure on the law of methane emission from thick coal seam were simulated. The results show that the microstructure changes obviously change the law of gas emission in thick coal seams, which leads to the obvious decrease of gas diffusion velocity and the exponential relationship, and slowly reduces the 3-stage characteristics of the coal seam. The gas drainage rule of thick coal seam The regularity and the absolute discharge of gas in thick coal seam do not change obviously with the change of gas pressure, but the influence of gas pressure mainly appears in the numerical value of gas diffusion velocity. When the gas pressure is fixed, the mining face of thick seam working face The gas concentration surge at the moment of exposing the new coal wall is dominated by the gas gushing from the coal wall. After the revelation of the new coal wall for a period of time, the gas gushed out from the coal wall is the main reason for the increase of gas concentration in the mining space. Under different conditions, when analyzing the source of gas in mining thick coal seam, it is not only necessary to judge according to the time when the coal wall is exposed, but also according to the gas pressure in the working face.