切顶沿空留巷无煤柱开采能够显著减少巷道掘进量，提升煤炭资源的采收效率，但由于相邻采空区间缺少隔离煤柱，切顶留巷接顶不严，导致采空区漏风严重，由此造成的采空区自燃“三带”的分布规律不明，使得切顶沿空留巷采空区在煤自燃防治工作缺少针对性，存在采空区自燃隐患。为此，以东荣二矿南二采区17202工作面为背景，通过理论分析、实验测试、数值模拟、现场试验等方法，研究切顶沿空留巷采空区内的漏风运移规律，并基于煤自燃特性参数研究了封堵前后采空区自燃“三带”的演化规律，提出了漏风封堵技术并进行了工程试验和效果分析。主要结论如下：

（1）通过释放SF₆示踪气体，得到了切顶沿空留巷工作面采空区内风流运移路线。采空区内的风流主要由主进风巷流入工作面后漏入采空区，到达采空区一定深度处向切顶沿空留巷侧偏转，最后从切顶留巷巷帮的空隙中漏入回风巷流出。通过数值模拟与现场实测结果进行对比验证，掌握了切顶沿空留巷采空区的漏风规律。

（2）通过对17202工作面煤样开展煤自燃程序升温实验，以不同粒径和不同供风量为实验条件，测得煤样在升温过程中煤自燃指标气体的变化规律、耗氧速率和放热强度等煤自燃特性参数，确定了东荣二矿南二采区17号煤层的临界温度为60℃~70℃，干裂温度为110℃~120℃。

（3）通过在17202工作面主进风巷和切顶沿空留巷侧布设气体观测点，得到了切顶沿空留巷采空区两侧不同深度处的氧气浓度变化情况，采用数值模拟得到了切顶沿空留巷采空区内氧浓度分布情况，并结合煤自燃特性参数综合判定了切顶留巷采空区煤自燃危险区域及自燃“三带”分布范围，确定了工作面的最小推进速度为1.7 m/d。

（4）通过数值模拟对17202工作面切顶沿空留巷侧重点漏风区域封堵，封堵后采空区内的风流运移路线及自燃“三带”的分布变化情况进行了分析，确定了阶段式封堵减少采空区漏风的实施方案。通过17202工作面切顶沿空留巷侧现场喷涂封堵，发现喷涂封堵前后切顶沿空留巷侧的漏风量明显降低。

Cutting the top along the empty stay lane without coal pillar mining can significantly reduce the amount of roadway excavation and improve the recovery efficiency of coal resources, but due to the lack of isolation coal pillars between adjacent mining areas, cutting the top of the stay lane with poor roof jointing, resulting in serious air leakage in the mining area, the resulting spontaneous combustion in the mining area "three zones" distribution law is unknown, making cutting the top along the empty stay lane mining area in the coal Spontaneous combustion prevention and control work lacks target, there is a hidden danger of spontaneous combustion in the mining area. To this end, the 17202 working face in the south second mining area of Dongrong Second Mine is used as the background to study the law of wind leakage and transportation in the mining area along the top-cut hollow stay lane through theoretical analysis, experimental test, numerical simulation and field test, and the evolution law of the "three zones" of spontaneous combustion in the mining area before and after blocking is studied based on the parameters of coal spontaneous combustion characteristics, and the wind leakage blocking technology is proposed and tested in engineering. The leakage plugging technology was proposed and engineering tests and effect analysis were carried out. The main conclusions are as follows:

By releasing SF₆ tracer gas, we got the route of wind flow transportation in the mining area of the working face along the cut-top stay-alley. The wind flow in the mining area mainly flows into the working face from the main air inlet lane and then leaks into the mining area, reaches a certain depth in the mining area and deflects to the side of the cutting top along the empty stay lane, and finally leaks into the return lane from the gap of the cutting top stay lane lane gang. Through numerical simulation and field measurement results for comparison and validation, the air leakage law of the cutting top along the hollow stay roadway mining void area is mastered.

By carrying out the coal spontaneous combustion procedure warming experiment on the coal sample of 17202 working face, with different particle size and different air supply as the experimental conditions, the parameters of coal spontaneous combustion characteristics such as the change law of coal spontaneous combustion index gas, oxygen consumption rate and exothermic intensity during the warming process were measured, and the critical temperature of coal seam 17 in the south second mining area of Dongrong Second Mine was determined to be 60℃~70℃ and the dry cracking temperature was 110℃~120℃.

By placing gas observation points in the main air inlet lane of 17202 working face and the side of the cut top along the empty stay lane, the oxygen concentration changes at different depths on both sides of the cut top along the empty stay lane mining area were obtained, and the distribution of oxygen concentration in the mining area of the cut top along the empty stay lane was obtained by numerical simulation, and the spontaneous combustion risk area of coal in the mining area of the cut top stay lane and the spontaneous combustion "three zones" distribution range were determined comprehensively by combining the parameters of coal spontaneous combustion characteristics. The minimum advance speed of the working face was determined to be 1.7 m/d.

Through numerical simulation, the key wind leakage area of 17202 working face cut top along the side of the empty stay lane was sealed, and the change of wind flow transportation route and distribution of spontaneous combustion "three belts" in the mining area after sealing was analyzed, and the implementation plan of phased sealing to reduce wind leakage in the mining area was determined. Through the spraying and plugging of 17202 working face cutting roof along the side of the empty stay lane, it was found that the amount of air leakage from the cutting roof along the side of the empty stay lane before and after spraying and plugging was significantly reduced.