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为准确计算煤炭开采过程中回采工作面采空区瓦斯封存量,基于采空区上覆煤岩层运移及裂隙分布发育规律,分析回采工作面采空区瓦斯封存量主要影响因素,建立回采工作面采空区瓦斯封存量计算模型,并对其进行计算验证。结果表明:回采工作面采空区封存瓦斯量主要受煤岩瓦斯赋存地质条件和开采技术条件2个方面因素影响;根据采空区上覆煤岩层垮落规律,采空区瓦斯封存量可分为压实稳定区瓦斯封存量、自然堆积区瓦斯封存量、承压影响区瓦斯封存量和采空区内遗煤瓦斯残存量4部分;用建立的模型计算某煤矿N2413综采工作面采空区瓦斯封存量,计算结果与实际结果之间相差13.5%,误差在合理范围之内。
In order to accurately calculate the gas storage in the goaf in the coal mining face, based on the rule of the coal bed strata movement and the distribution of fractures in the goaf, the main influencing factors of gas storage in the goaf are analyzed, and the recovery work Surface gob gas storage capacity calculation model, and its calculation and verification. The results show that the amount of sequestrated gas in the goaf is mainly affected by the geological conditions of the coal and the technical conditions of mining. According to the caving law of overlying coal bed, the gas storage in the goaf can be It is divided into four parts: gas storage in compaction and stability area, gas storage in natural accumulation area, gas storage in pressure-affected area and gas remaining in coal mined-out area. Using the established model to calculate N2413 fully mechanized mining face Gas storage area, the difference between the calculated results and the actual results of 13.5%, the error within a reasonable range.