Study On The Application Of Rock Burst Prevention And Control Under The Influence Of Overhanging Roof On Working Face In Huating Coal Mine

HuatingCoal Mining area in addition to the first 2501 mining face does not appear rock bursts,a total of five working face in mining process,due to the complicated geological conditions,mining depth increasing,the factors of adjacent working face roof hanging together,leading to a sharp rise in the working face impact ground pressure hazard,cause roadway is damaged many times,equipment,personnel losses,seriously affect the safety mining work.In view of the above problems,this paper takes Huating Coal Mine's current mining face as the research object,studies and analyses the geological conditions and geographical location of Huating Coal Mine 2501 mining area,and determines the influence of geological factors on the current mining face.According to the appraisal results of coal and rock burst tendency in 1501 mining area,it is determined that the working face has medium to strong burst risk during mining,and the dangerous area is divided.Guided by the mechanism of dynamic and static overlaying induced rock burst,combined with the actual mining situation of Huating Coal Mine,the main force source of rock burst in Huating Coal Mine is analyzed.The static load is determined to be ground pressure and abutment pressure,and the dynamic load is the basic roof pressure and overburden movement.Determine the relevant factors affecting the supporting face,combined with the actual occurrence of rock burst,determine that rock burst is roof impact type,and analysis and determination is affected by the adjacent working face goaf not caving roof,forming a combination of"cantilever beam"structure in the goaf,"secondary breakage of the adjacent working face overhanging roof,impact on the roadway in front of the working face"is the dominant factor.On the basis of the judgement results,the methods of microseismic method,acoustic emission method and drilling cuttings method are used to carry out comprehensive monitoring and prediction,and the results are tested.Finally,on the basis of the mechanism of strength weakening and scouring reduction,comprehensive treatment is carried out by means of large diameter borehole pressure relief,coal body pressure relief blasting,coal seam water injection,roof pre-splitting blasting and other methods.By comparing with adjacent working faces,it is shown that this application research has achieved good results.