【摘要】 针对切顶留巷无煤柱开采下采空区留巷的侧帮段漏风面积大、漏风通道广等特点,以杜儿坪煤矿切顶留巷工作面Y型通风为例,运用CFD软件对留巷侧帮段堵漏风材料不同孔隙率的漏风流场、漏风量和漏风氧浓度进行数值模拟研究。研究结果表明:工作面漏向采空区方向随多孔介质孔隙变大而漏风量也变大,且漏风量随至下隅角距离增大,呈现急剧减少→抛物线上升→线性减少→在靠近留巷处又急剧增大;随着多孔介质孔隙率增大,留巷向采空区的漏风量也越大,且沿工作面走向长度的增大,留巷向采空区漏风量逐渐减少;随着孔隙率变大,漏风氧浓度也逐渐变大。更多还原

【Abstract】 Aiming at the characteristics of large air leakage area and wide air leakage channels in the side section of the goaf in the goaf under the no-pillar mining in the cut-top stayed roadway,taking the Y type ventilation in the cut-top stayed roadway in Duerping coal mine as an example.The CFD software is used to numerically study the air leakage flow field,air leakage volume and air leakage oxygen concentration of different porosity of the air leakage material in the side lane of the retaining lane.The research results show that the leakage of the working face towards the goaf will increase with the increase in the porosity of the porous medium,and the amount of air leakage will increase.As the distance to the lower corner increases,the amount of air leakage will decrease sharply→parabolic rise→linear decrease→approaching the retaining lanes increased sharply again;as the porosity of the porous medium increase,the leakage from the retaining lanes to the goaf became larger,and the length along the working face increase,and the leakage from the retaining lanes to the goaf gradually decrease;as the porosity increases,the leakage oxygen concentration also gradually increases.更多还原