Research On The Feasible Sequences Of Mining Multiple Seams Under Aiweiergou River Bed

Multiple coal seams or thick coal seam layering that generally are using the downward mining sequence.However,using the anti-procedure mining method of program mining and up mining could get better result in special cases.Reasonable coal seam mining sequence should be equipped with security and high efficiency,which should get the maximum recovery of coal resources.It is generally forming the water flowing fractures when coal seams were mined,this situation has an influence on mining multiple seams.The no.4,no.5 and no.6 coal seams anti-procedure mining research are essential under Aiweiergou river,which is an engineering background to study the reasonable sequence of mining multiple seams.This paper is aim to solve the mining sequence of coal seams about new river of crossing the ancient river bed in coal mine's no.4,no.5 and no.6 coal seams with theoretical analysis,field practice,UDEC simulation and so on that all methods respectively are adopted to study the mining sequence.The three-zones method,ratio criterion judging method,surrounding rock balance method and the other methods are fully summarized by adopting anti-procedure mining theory,overlying strata destruction and the law of overburden destruction and related theory that determine the feasibility of the program mining and safety from theory.And the distribution characteristics of coal seams and physical and mechanical index of coal strata,water flowing fracture zone,and the simulation on overlying strata destruction and security analysis of mining method and its protective measures were fully studied and summarized.The study results show that theoretical analysis ruled out the unreasonable program mining sequences.There are results of water flowing fracture by numerical simulation of program mining sequence and anti-procedure mining sequence of up mining and program mining.This paper get the he mining range's elevation of three coal seams under two sequences.Also assure the sequence 5?4?6 as the mining sequence of three coal seams.