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为了解决长钻孔取样暴露时间长、损失瓦斯量推算误差偏大的问题,采用自主研发的试验系统对煤屑暴露初期长时间段内的瓦斯解吸规律进行试验研究,找出了极限瓦斯解吸量与吸附平衡压力的关系,并对Qt=K t和Qt=Q∞(1-eλt+A)两个理论公式在不同时间段内的拟合效果和损失量推算误差进行对比。结果表明,两公式在不同时间段内的拟合效果显著,决定系数均在0.94以上。从损失瓦斯量的推算误差来看,前者在30 min内的推算误差较小,相对误差最大值小于7%,但随拟合时间段的向后推移,推算误差越来越大,最小值在40%以上;后者在30 min内的推算误差较大,相对误差都在24%以上,而在30~70 min和70~120 min内的推算误差较小,相对误差都在11%以下。因此,前者适合煤样暴露短时间内损失瓦斯量的推算,后者则适用于暴露长时间后的损失瓦斯量推算,联合两个公式,按时间段推算损失瓦斯量,就可以减少长时间段内的计算误差。
In order to solve the problem of long drilling sampling exposure time and large loss estimation error of gas loss, a self-developed test system was used to study the gas desorption regularity during the initial period of coal chip exposure for a long period of time, and the ultimate desorption amount And the equilibrium pressure of adsorption, and the fitting effect and the error of estimating the amount of loss for two theoretical formulas of Qt = K t and Qt = Q∞ (1-eλt + A) are compared in different time periods. The results show that the fitting results of the two formulas in different time periods are significant and the coefficient of determination is above 0.94. Judging from the estimation errors of the lost gas volume, the former has a smaller estimation error within 30 min and a maximum relative error less than 7%. However, with the backward fitting of the fitting time interval, the estimation error is getting larger and larger, 40%, respectively. The latter has a larger estimation error within 30 min with a relative error of more than 24%, while the estimation error is small within 30-70 min and 70-120 min, with relative errors below 11%. Therefore, the former is suitable for estimating the amount of gas lost in a short period of time when coal samples are exposed, while the latter is suitable for estimating the amount of gas lost after a long time of exposure. Combining the two formulas and calculating the amount of gas lost in a time period can reduce the long- Calculation error within.