大采高工作面采空区顶板垮落时岩体相互撞击摩擦产生火花已成为诱发采空区瓦斯爆炸事故的主要隐患。为研究砂岩摩擦速度、摩擦力、瓦斯体积分数、SiO₂含量等因素对砂岩摩擦诱发瓦斯爆炸的机制，采用岩石摩擦效应引燃瓦斯试验系统对各因素进行定量试验研究。结果表明：瓦斯体积分数为7.0%~11.5%时，砂岩摩擦诱发瓦斯爆炸时间随瓦斯体积分数增加先缩短后延长；砂岩摩擦高温热表面是诱发瓦斯爆炸的主要原因；摩擦诱发瓦斯爆炸分为砂岩摩擦面燃烧瓦斯与瓦斯爆炸扩散2个阶段；摩擦诱发瓦斯爆炸时间随摩擦力增大而缩短，随砂岩中SiO₂含量增大而缩短；摩擦低于最低临界速度不会诱发瓦斯爆炸，高于最低临界速度且低于最高临界速度时最大摩擦速度与摩擦诱发瓦斯爆炸时间呈负相关。

The collision and friction between the rock masses during the caving of the gob roof has become an important hidden danger to induce the gas explosion accident in the gob. In order to study the mechanism of gas explosion induced by sandstone friction by friction velocity, friction force, gas concentration, SiO₂ content and other factors, the rock friction effect igniting gas test system was used to conduct quantitative test research on each factor. The results show that when the gas concentration is 7.0%-11.5%, the gas explosion time induced by sandstone friction first decreases and then increases with the increase of gas concentration. The high friction and hot surface of sandstone is the main cause of gas explosion. Gas explosion induced by friction can be divided into two stages: gas burning on sandstone friction surface and gas explosion diffusion. The time of gas explosion induced by friction decreases with the increase of friction and the increase of SiO₂ content in sandstone. When the friction is lower than the minimum critical velocity, the gas explosion will not be induced. When the friction is higher than the minimum critical velocity and lower than the maximum critical velocity, the maximum friction velocity is negatively correlated with the gas explosion time.