1) Crack of top coal
顶煤裂隙
3) fissures of coal
煤体裂隙
1.
The main geological factors which influenced top coal caving and broken characteristic contain:the strength of coal,the mining depth of coal seams,the features of coal seams with middle band,the thickness of coal seam,the fissures of coal,the roof features of coal-bed,etc.
影响顶煤垮落和破碎特性的主要地质因素有煤体强度、煤层采深、夹矸层特征、煤层厚度、煤体裂隙、煤层顶板特征等。
4) issured coall
裂隙煤体
5) fractures in coal
煤中裂隙
1.
According to the literature,the technique,mechansim and the foundation(fractures in coal)will be discussed.
本文将对裸眼洞穴法完井的工艺、机理及其先决条件———煤中裂隙进行综述,为该技术在我国煤层气开发中的应用和推广提供参考。
6) type of coal fissure
煤裂隙型
补充资料:综采放顶煤
综采放顶煤:厚煤层煤炭开采技术之一。把原来分层开采的煤炭,一次采完。方法是,在煤层底部按传统方法开采,使上面的煤炭在矿压的作用下,自动落下来。
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条