mined roof

英 美
  • 顶部回采
  • mined adj.开采的动词mine的过去式和过去分词形式.
  • roof n.屋顶;顶vt.覆盖;给...覆以屋顶
    1. With the increase of the depth of coal seams mined, rock bursts will easily occur in gateways with fully-mechanized sublevel caving mining.
      摘要随着煤矿开采深度增加,综放开采回采巷道易发生冲击地压危害。