Study On Support Technology In The Lower Seam Of Short Distance Coal Seams

In Short distance coal seam group with downward mining law, the integrity of the lowercoal seam is affected by the upper coal seam mining damage. After the upper coal seam mined,the gangue is over the roof of the lower coal seam. The stress concentration is formed in floorunder the left coal pillars after upper coal seam mined, which influenced the stress distributionin floor, Especially when the roof is a composite of the upper strata of the lower coal seamparticularly obvious, When excavation jobs, the roof of workface is easier to drop, thedeformation of roadway is large, and the mine pressure behavier is obvious, the roof extremilyfall. There are a lot of technique problems existing in the close coal seams mining.Based on the study of the closed distance coal seam group in Wuhushan Coal Mine inWuda coal area of Shenhua Group, Through Site measurement theory analysis numericalsimulation and industrial test methods, The upper coal seam of closed distance coal seammining dynamic pressure effects range and Surrounding rock in mining roadway in structuralcharacteristics and reasonable position and effect of supporting parameters doing exploratoryresearch.Using slip line field theory and the theory of elastic-plastic derived from close rangedamage of the upper coal seam floor failure depth. Through the electronic borehole observationinstrument and the geological situation awareness in wuhushan mine, analyzed12coal roofoccurrence strata, Determine the scope of surrounding rock loose circle and gained valuablemeasured data, provide a reference for selection of roadway support parameters. Select therational arrangement of coal seam roadway locations, reducing the size of coal pillar design,improved recovery rate. Reducing the stress concentrations in roadway, creating goodconditions for roadway. According to the actual situation of Wuhushan mine, finally settled on athe use of bolt and anchor combined support schemes, Based on anchoring of roof stabilitytheory, seek a bolt support parameters, taking anchor reinforcement to prevent caving archdevelopment, establishing anchor parameter. With FLAC software simulation, verify the reasonableness of proposed roadway layout and determine the bolt and anchor combinedsupport schemes. In1208face of wuhushan mine industrial test of support programmes, Resultsshow that the bolt-cable combined supporting of roadway deformation control played a goodrole, can meet the needs of actual production.