Research On Supporting Technology Of Coal Roadway In Dynamic Pressure Under Coal Bifurcating Area Parting

When the coal mine entered into deep mining, after the up coal seam bifurcating area finished mining, the coal roadway of down parting in the tunneling process, receives the influence from up coal seam mining, it must consider the degree of up coal mining influence and the corresponding distortion, displacement, and pressure value, as rests on take the comprehensive consideration, chooses the suitable supports way and the correct parameter.The Baodian coal mine seven mining area entered into down coal seam mining, the down coal seam nearby bifurcating area, its tunnel roof are parting and up coal seam goaf, the parting is small thickness, it has already received influence from up coal seam mining,the tunnel reasonable arrangement and the reasonable supports technical question is the new technical subject meets the Baodian coal mine require.This article analyzes coal seam mining of part three, the overburden load will shift to the residual virgin coal pillar, around it fiished mining, the overburden pressure distributes again, its certain depth forms the abutment pressure area. Analyzed relation between section coal pillarthe and residual coal pillar, determined uses with crossheading both sides out malocclusion placed, guaranteed that down coal seam mining gateway under throughout the spatial release of pressure area, realized the small and narrow virgin coal pillar along to gob-side entry driving. The down coal roadway support computation, combination the roof balanced arch structure used the improvement pu's theory, analyzed the stability that combination extrusion arches, indicated after the computation, the tunnel anchor rod supports guaranteed has the enough initial assembly strength to be possible to guarantee the roof combines the 2.2m thick stable built-up beam.This article in view of the Baodian coal mine seven mining area up 3 coal seam mining actual need, uses discrete element number methods and theoretical analysis, theoretical analysis, field test research, studies the stability of gob-side entry driving determined when selects the sector virgin coal pillar size is 4m, the tunnel adjacent formation amount of deformity and the tension failure area scope is most reasonable.The analysis that parting thickness is smaller than 4m, the tunnel selection awning supports way carries on the feasibility analysis, according to the tunnel adjacent formation amount of deformity, targets and so on displacement vector has proven the awning supports and protections rationality. In the analysis that parting thickness is smaller than 4m,, supports both rationality compared with the awning supports and the anchor cable truss, had proven the truss anchor cable is more advantageous to the tunnel adjacent formation stability, is the more reasonable supports and protections way.Analyzed the truss anchor cable system supports mechanism, may see the truss anchor cable to realize the initiative supports changes the tunnel adjacent formation the stressful condition to open the limit function effectively to the vertical jointing, has controlled the tunnel roof distortion. Explained that the truss anchor cable system is supports and protects under the short distance coal bed worked-out section the coal lane's effective measure. After the scene practice, the truss anchor cable system supports and protections engineering research obtains the success, experimented tunnel length 500m, the mineral pressure observation effect is reasonable, has obtained the quite good technical security and the social economy effect.