Steep mining based on the optimized width of transportation flat and economic benefit

The large width of transport flat leads to a smaller angel of end-slope than that satisfies the requirement of stability, with part of coal resources buried and not mined.For improving economic benefit, steep mining scheme based on the optimized width of transportation flat is put forward, and cost and income are analyzed.The scheme is available when the cost of transportation flat optimization is less than income of steep mining based on it.The results show that respectively using the form of main-walled and auxiliary-blocked as well as coupled pipe-drain drainage by changing remaining wall and drain reduces width of transportation flat by 30.8 m, the cost of optimization measures increases by 5.208 million yuan.Steep mining based on this scheme increases production of coal resources by 373 060 t and income by 27.661 million yuan.Steep mining based on the optimized width of transportation flat increases the economic benefit by 22.453 million yuan.The economic benefit based on the width optimization of flat plate is very significant.