Safety Mining Technology And Economic Analysis Of Hard Roof Coal Seam In No.8 Mining Area Of Jinda Coal Mine

Aiming at the problem of continuous shortage of mining in Jinda coal mine,this paper adopts the method of combining technical analysis and economic analysis to study the preparation mode of eight mining areas and the layout mode of section roadway.Using the principle and method of engineering economics,this paper studies the investment risk of mining in Ba Mining area.The main contents are as follows:(1)According to the occurrence conditions of coal seams in The eight mining areas,the existing production system and the requirements of the break-even point between the mine and the group company,the production capacity,service life of the eight mining areas and the number of coal mining faces are dctermined.This paper puts forward several feasible ways of preparation for mining area,and through the comparison of technology and economy,selects the best way of preparation for mining area,and forms a scientific and reasonable plan for preparation for mining area.(2)According to the roof rock conditions of the coal seam in the 8th mining area of Jinda Coal Mine,the FLAC3D numerical model is established to conduct the stability of surrounding rock of three kinds of roadway layout:small pillar retaining roadway,gob retaining roadway with filling beside the roadway,and gob retaining roadway with pre-split arch.The analysis results show that the subsidence and stress state of the roof are the smallest among the three arrangements when using the technique of pre-split arch along gob.By using the economic method,the increased cost of the three schemes is calculated,and it is concluded that the coal cost per ton and the total investment amount of the pre-split arch gob roadway are the minimum,and the pre-split arch gob roadway technology is the optimal research conclusion from both technical and economic perspectives.(3)Using the principles and methods of engineering economics to carry out the engineering economic evaluation of the mining in The Eight mining area;A visual analysis software of investment risk based on Monte Carlo method is developed.The software is used to analyze the investment risk of baicai mining area.The analysis results show that the investment in Baicai mining area is feasible.