CAJ | 학술논문

针对近距离煤层群高瓦斯工作面的地质及回采条件，建立采场底板卸压数值分析模型，选取膨胀量和卸压系数两个指标分析了底板煤岩层运移和应力变化特征，指出作用于底板煤岩层应力的急剧增大与减小导致出现卸压膨胀现象，随工作面推进范围扩大，最终膨胀量和卸压系数大小分布呈现马鞍型。为减少底板煤岩体内卸压瓦斯涌入工作面，采用底抽巷治理瓦斯的方案，提出了底抽巷的布置原则。工程试验中，底抽巷顺层钻孔抽采瓦斯纯量及浓度逐渐稳定在最高值7 m3/min 和50％，工作面回风流及尾巷风流瓦斯浓度稳定在0??55％及0??6％以下，实现了煤与瓦斯共采。
침대근거리매층군고와사공작면적지질급회채조건，건립채장저판사압수치분석모형，선취팽창량화사압계수량개지표분석료저판매암층운이화응력변화특정，지출작용우저판매암층응력적급극증대여감소도치출현사압팽창현상，수공작면추진범위확대，최종팽창량화사압계수대소분포정현마안형。위감소저판매암체내사압와사용입공작면，채용저추항치리와사적방안，제출료저추항적포치원칙。공정시험중，저추항순층찬공추채와사순량급농도축점은정재최고치7 m3/min 화50％，공작면회풍류급미항풍류와사농도은정재0??55％급0??6％이하，실현료매여와사공채。
In view of the geological and extraction conditions of coal seam group in close dis-tance of high gas working face,the numerical analysis model of pressure relief from stope floor was set up,and the two indexes of swelling capacity and pressure relief coefficient were selected to analyze the coal floor strata movement and the stress variation characteristics?? The results showed that the sharp increase and decrease of stress on the coal floor strata result in swelling af-ter pressure relief,with the extended swelling along with the working face advancing??And the fi-nal swelling capacity and pressure relief coefficient distribution present saddle pattern??To reduce the released gas from coal floor strata to rush in working face,the layout principles of end-located drainage roadway was put forward??In engineering practice,the gas emission and its concentra-tion were gradually up to7 m3/min and 50 % from boreholes along seam in end-located drainage roadway,and the gas concentration in air flows of return airway and tail roadway at the working face were stabilized to below 0??5 5 % and 0??6 %,achieving the coal and gas simultaneous extrac-tion.