College of Safety Science and Engineering, Xi’an University of Science & Technology
Key Laboratory of Western Mine Exploitation and Hazard Prevention Ministry of Education, Xi’an University of Science and Technology
Western Engineering Research Center of Mine Gas Intelligent Drainage for Coal Industry
Xinjiang Uygur Autonomous Region Coal Science Research Institute
Liuhuanggou Coal Mine, Yankuang Xinjiang Mining Co., Ltd.
Xinjiang Coal and CBM Engineering Technology Research Center

倾角煤层的开采，常伴随输送机上窜、下滑问题。一般通过增加伪斜长度来确保液压支架的正常移动，并为机头机位提供更多作业空间，但伪斜长度增加会影响架间和上隅角瓦斯变化，导致工作面出现瓦斯浓度异常现象。针对倾斜厚煤层开采中容易出现上隅角瓦斯超限的问题，应用Fluent数值模拟软件，分析不同伪斜长度下采空区瓦斯浓度分布规律，确定最优伪斜长度。为研究采空区瓦斯运移规律，应用Fluent数值模拟软件，在伪斜长度分别为20、25、30、35 m条件下对“ U” 型通风方式下的采空区瓦斯分布及流场情况进行研究。模拟发现：伪斜长度在一定程度上影响采空区内的风流，使得采空区内风流紊乱，瓦斯局部地区集聚严重，进而对采空区内的瓦斯分布及运移造成一定的影响。研究结果表明：工作面伪斜长度对于采空区瓦斯浓度分布有显影响，随着伪斜长度的增加，采空区内风流发生提前转向，导致采空区瓦斯提前向工作面涌出，瓦斯异常区从上隅角处逐渐向工作面偏移，上隅角瓦斯浓度逐渐降低。通过模拟结果对现场伪斜长度优化应用后，试验工作面在伪斜长度25 m左右时，上隅角、回风巷最大瓦斯体积分数均控制在1%以内，工作面未出现瓦斯异常积聚现象。模拟结果与现场观测结果吻合，得到最优伪斜长度为25 m。

The mining of inclined coal seams is often accompanied by the problem of conveyor upward and downward movement. Generally, the pseudo-slope lengths (PSLs) were increased to ensure the normal movement of the hydraulic support and to provide more working space for the headstock. The increase of PSLs would affect the change of gas in the inter-frame and upper corner, resulting in abnormal gas concentration at the working face. To address the problem of gas exceedance in the upper corner of inclined thick coal seam mining, Fluent numerical simulation software was applied to study the gas distribution and flow field in the U-shaped ventilation method from the PSLs of 20 m, 25 m, 30 m, and 35 m respectively. The simulation found that the PSL, to a certain extent, affects the wind flow in the mining area, making the wind flow in the mining area disorderly, and the gas collects seriously in local areas, which in turn has a certain influence on the gas distribution and transportation in the mining area. The research results showed that: the PSLs had a significant influence on the gas concentration distribution in the mining area, with the increase of PSLs, the wind flow in the mining area would turn in advance, resulting in the gas in the mining area gushing out to the working face in advance, and the gas abnormal area will gradually shift from the upper corner to the working face, and the gas concentration in the upper corner will gradually decrease. After optimizing the application of the simulation results to the PSLs in the field, the maximum gas concentration in the upper corner and backwind tunnel was controlled within 1% at the PSLs of about 25m in the test working face, and there was no abnormal gas accumulation in the working face. The simulation results match the field observation, and the optimal PSL is 25 m.

国家自然科学基金面上资助项目（51974237，52174205）；新疆自然科学基金资助项目（2019D01B42）

赵鹏翔，安星虣，李树刚，等. 倾斜厚煤层综放工作面伪斜长度与上隅角瓦斯浓度耦合机制研究[J]. 煤炭科学技术，2023，51（S1）：73−85.

ZHAO Pengxiang，AN Xingbao，LI Shugang，et al. Coupling mechanism of pseudo-slope length change and gas concentration in upper corner of fully mechanized caving surface of inclined thick coal seam in Xinjiang[J]. Coal Science and Technology，2023，51（S1）：73−85.