Feasibility Study On Mining Scheme Of The5^th Coal Seam In Heidaigou Surface Coal Mine

The5thcoal seam in Heidaigou surface coal mine is a thin coal seam and locallymined. It is located in the throwing rocks blasting step which is in the upper part ofthe main coal seams. Mining on the5thcoal seam will has an influence on the6thcoalseam which is under the5thcoal seam.In order to ensure a smooth mining on the6thcoal seam, the mining scheme design and feasibility assessment on the5thcoal seamis necessary.The research objectives of this paper are completed by theoretical analysis andmathematical. Firstly, previous studies in thin coal seam areas are summarized. Afeasibility analysis on the5thcoal seam is carried out from the perspective of thegeological resource conditions.Secondly, analyze the5thcoal seam mining viable process detailedly withoutconsidering the impact on the main coal seam, then a mathematical model for viableprocess evaluation is build by choosing evaluation indexes. We can use this modle toselect the viable process and recommend the surface miner semi-continuous processfinally.Thirdly, according to the geological resource conditions and production status ofHeidaigou surface coal mine, four mining schemes of the5thcoal mining are proposed,which are mining scheme based on current mining conditions, mining scheme byusing loose blasting-single buchet-truck stripping on the rock under the5thcoal seam,mining scheme by using casting blast-dragline overcast on the rock under the5thcoalseam and mining scheme by using loose blasting-dragline overcast on the rock underthe5thcoal seam respectively. Through a technical feasibility analysis on the fourmining schemes, I find that the5thcoal seam is inappropriate to be mined based oncurrent mining conditions and the mining scheme by using loose blasting-singlebuchet-truck stripping on the rock under the5thcoal seam is not recommendedbecause it changes the current process of Heidaigou surface coal mine seriously. Theremaining two mining schemes are both technically feasible. Finally, the miningscheme by using loose blasting-dragline overcast stripping on the rock between the5thand the6thcoal seam is recommoned.Last, surface miner is determined to the mining of the5thcoal seam. Otherrelated content are also included in this paper, such as working methods of the surfaceminer, operating procedure, working area parameters, accumulation process of the coal ridge and arranging of transportation system etc. Then the working characteristicof the cutting rotors in the surface miner are analyzed. The position of the seletedmining line when using suface miner is determined from the perspective of economiclosses by gangue mixing and losing of the5thcoal seam. Tiered election for the5thcoal seam is designed last.