Fuzzy comprehensive evaluation method was applied to build a fuzzy mathematic model to analyze mine coal and gas outburst hazard.
采用模糊综合评价方法建立模糊数学模型，对矿井煤与瓦斯突出危险性进行分析。
Tests show that coal with larger porosity, lower strength and higher velocity of gas desorption is more dangerous in hazard of outburst.
试验表明突出危险煤较非危险煤孔隙率大，强度小，且具有更大的瓦斯解吸速度。
The relationship between hazard of outburst and characteristic of pore-structure and velocity of gas desorption in coal seams is analyzed on basis of study in laboratory and field site.
通过试验室和现场考察，分析了煤的孔隙结构特征、瓦斯解吸速度与煤的突出危险性的关系。
There are strict regulations in top-coal caving mining with hazard of coal and gas outburst. The main reason is the problem of safety.
煤与瓦斯突出危险煤层的放顶煤开采有严格的法规限制，限制主要是从安全上考虑的。
There are strict regulations in top-coal caving mining with hazard of coal and gas outburst. The main reason is the problem of safety.
煤与瓦斯突出危险煤层的放顶煤开采有严格的法规限制，限制主要是从安全上考虑的。
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