(二)回采的五项措施 1.煤壁注水 煤壁注水可以把粉尘在煤体中固结起来,不仅能消除回采工作中的粉尘飞扬,而且能防止运煤和选煤时产生粉尘,是煤矿防尘的一项重要措施。 煤壁注水是将水在相当大的压力下通过钻孔压入煤体,这时,水就沿煤体的微隙散布,润湿煤层。 根据钻孔的深度,煤 (B) of the five measures of mining 1. Coal wall water injection Coal wall water can consolidate the dust in the coal, not only to eliminate dust flying back to work, but also to prevent coal and coal dust generated when the election is Mine dust prevention is an important measure. Coal wall water injection is water under considerable pressure through the hole into the coal pressure, then the water spread along the coal’s micro-gap, wet the coal seam. Depending on the depth of the hole, coal