coal body is watered by deep hole high pressure above mid-hard coal seam to soften the harder coal so as to improve the working efficience. it's a new way for mechanization mining in harder seam.
在中硬以上的较坚硬煤层进行煤体深孔高压注水,从而软化煤体硬度提高破煤速度,进而提高劳动生产率。
through surmounting solves the technology knotty problem of retrieving coal column of mining area with the system mechanization mining technique. by application in mining process the effect is better.