Analysis of pre-blasting technology in top coal of steep seam

The weakening of top coal in steep and thick coal seam is one of the key technologies to achieve safe and efficient exploitation.Currently,the horizontal section of top coal caving as a scientific method of mining in steep seam has become the only used method in Urumqi coal region.Based on the research background of high section and mechanically caving mining problems on the process of mining in Urumqi steep and thick seam,according to a comprehensive survey of mining conditions of east No.3 face in Jian-gou mine +564mB_3+6 coal seam,analyze the source of danger that may induce danamic disaster in caving mining process,optimize and implement the advanced pre-blasting programe.Variety of fileld monitoring methods are adopted to achieve safe mining.