In order to solve the problems of low coal recovery rate and poor economy that existed in the underground support program of Sihe coal mine using reserved coal pillars,an underground coal pillar-less lane-forming technology based on the"110 work method"is proposed,which integrates the use of the NPR constant-resistance anchor cable reinforcement,the roof plate directional pre-cracking and cutting slits,the stay-road gangue blocking support and the monitoring and warning technology of the mine pressure,and realizes the improvement of the coal recovery rate in the underground.It realizes the improvement of underground coal recovery rate.According to the practical application,this technology can reduce 44％of the roadway excavation,recover 180,000 tons of coal per year,and create an economic benefit of 54 million yuan.
"110 work method"coal-free pillar roadwayconstant resistance anchor cabledirectional pre-cracking
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