单词broken coal
na.: 碎煤
网络: 破坏煤；煤块
碎块级无烟煤
Because of crack structure, high gas amount, concentrated stress, soft and broken coal, it"s very difficult for tunneling.
巷道在掘进时由于受断裂构造的影响，瓦斯含量大，应力集中，煤体松软、破碎，掘进困难。
Exploitation Technique of Using the Suspended Bracket to Put Down Upper Coal in the Punky and Broken Coal Bed
松软破碎煤层悬移支架放顶煤开采技术
Experimental study on the characteristics of compaction of the saturated broken coal waste
饱和煤矸石的压实特性研究
Supporting technology with meshing and bolting in high gas, inflammable, soft-broken coal seam
高瓦斯易燃松软破碎煤层锚网支护技术
Experiment Introduction of Broken Coal with High-pressure Waterflood in the Pits in Pinghu Coal Mine
坪湖矿井高压注水破煤实验简介
Study and Practice of Bolt-Beam-Mesh Support Technology for Broken Coal Roof in Steeply-tilting Coal Seam
大倾角复合破碎顶板煤层锚梁网支护技术研究与应用