There was an inverse"C"shape crack zone ahead of mining face where methane was active.
认为工作面前方煤体存在反的＂C＂形裂隙发育带，是瓦斯流动活跃区域。
There exits bed separation zone above water-conducting crack zone overburden after coal mining.
煤层采后覆岩中的导水裂隙带之上存在离层带。
Based on the fractal characteristic of concrete material, the relation between fracture toughness and height of crack zone is analyzed.
根据混凝土材料裂纹的分形特性，分析了混凝土的断裂韧度与裂纹带高度之间的变化关系。
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