Studies on the blasting technology used to raise lump coal ratio of coal face

Abstract：According to the conditions of coal face in Chensilou coal mine of Yongcheng mining and electricity group, the millisecond delay blasting technology and parmeters for raising lump coal ration of coal face by blast_hole mining are studied by theoretic analysis and experiment in site.The optimized blasting parameters in the condition of soft coal mass, side fall of coal face and broken roof are determined.The lump coal ratio is raised by 6%to 10% under the condition of safety and high production.The economic benefit is obviously improved.

Keyword：coal face;delay blasting;blasting parameter;lump coal ratio;