RESEARCH ON DESTROYED DEPTH OF FLOOR IN CUIZHUANG COAL MINE 23 UPPER 13 WORK FACE

摘要

Cui Zhuang coal mine carried out the job of testing the destroyed depth of the 3ed upper coal's floor, the detection used drilling answered hole of mine shaft, and the double-water shutoff observation techniques to determine the destroyed depth, and the destroyed depth of 23 upper 13 coal face's is 12.71 m. The detection results provides a reliable basis for the safety of the 3ed lower coal's mining under the ponding area in Cui Zhuang coal mine.