Research Of Uphill Roadway Reasonable Arrangement And Support In The Gently Inclined Coal Seam Group Cross Mining

With the gradual reduction of coal resources, coal mines uses generally mining of spanning entry for floor uphill roadway maintenance in our country to enhance the coal resources recovery, increasing economic benefits. its advantage has reduced roadway excavation rate, rational exploitation of mining resources, improving the mine's technical and economic indexes, the floor uphill roadway to be in release of pressure area after mining of spanning entry and so on.However, the original support roadway maintenance status is still good before affected by cross-mining, but roadway maintenance becomes quite difficult by the strong pressure effect in cross mining process. Therefore, the stability control problem of floor uphill roadway by cross-mining becomes urgent to solve in the production process.Based on the geological condition of Lubanshan north mine, the floor roadway deformation regularity in the process of coal seams cross mining was exposed, the reasonable position of uphill roadway and the rational arrangement of stop coal pillars was analyzed, the rational and effective support was posed by using combined research of the theoretical analysis, the numerical analysis and the field measurement.There main search aehievements are as follows:( 1 ) The surrounding rock loose circle of uphill roadway before and after affected by cross-mining in Lubanshan north mine was measured by using GPR(Ground Penetrating Radar). And cross mining influence coefficient was confirmed by calculating.( 2 ) Based on the field situation of Lubanshan north mine, the numerical models were set up by numerical analyses software UDEC which is suited to analyses rock stratum rupture and collapse. The stope stress distribution rule of coal seams group were analyzed, the reasonable position of floor uphill roadway and the rational arrangement of stop coal pillars were posed.( 3 ) Based on numerical analyses results of the stress,displacement and plastic zone distribution evolution courses of floor uphill roadway in the process of coal seams cross mining, the deformation regularity and failure mechanism is posed.( 4 ) Based on the surrounding rock control theory, the root deformation and failure causes of uphill roadway by using anchor net spray and arch centering to support was analyzed. Reinforced scheme of uphill roadway by using combined anchorage and cable reinforced supporting was proposed, which effectively control surrounding rock stability of uphill roadway .