With the increase of mining depth , the gas content of coal seam increases constantly , and gas emission in goaf rises,too.The problems of gas emission beyond the limit in upper corner easily arise under U -shaped venti-lation mode ,and it affects safety production of coalmine seriously .However , under U+L-shaped ventilation mode , it can solve the problem of gas emission beyond the limit in upper corner and has obvious effect on gas prevention of working face by using hysteretic cross-openings and gas drainage .According to the principles that the gas concen-tration in tail lane , cross-openings and upper corner should be up to regulations , and the furthest distance between cross-openings should be economic and reasonable possibly .Based on the actual situation of penta 8-22310 working face of PingDingshan Mining six ore , the distribution regularity of gas in the golf under the two situations of extrac-ting gas or not in tail lane was simulated by Fluent , and the furthest distance between cross-openings was obtained . The results have a guiding significance to the determination of distance between cross-openings and gas prevention of working face under U+L-shaped ventilation mode .%随着煤层开采深度的增加，煤层瓦斯含量不断增加，采空区瓦斯涌出量也随之上升，“U”型通风方式容易出现上隅角瓦斯超限等问题，影响煤矿安全生产，而“U＋L”型通风方式中滞后横川和瓦斯抽放的运用对消除上隅角瓦斯超限和工作面瓦斯防治具有明显的作用。根据尾巷、横川及上隅角处瓦斯浓度符合规程且工作面横川间距最远时最经济合理的原则，针对平煤六矿戊8-22310工作面实际情况，利用Fluent软件模拟了尾巷有、无抽放时采空区瓦斯分布规律，得出了尾巷有抽放时和无抽放时最远横川间距。研究成果对“U＋L”型工作面横川间距确定及工作面瓦斯防治提供了理论指导。
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