Study On The Stability Of Mining Roadway And Surrounding Rock Control Technology Of Ultra-close Muttiple-seams

With the increase of China’s coal mining industry gradually, the better seam closer to exhaustion.However, as the main energy of the national economy, the coal is still needed for large-scale extraction inthe future. Where conditions are relatively poor, they should be come into in sight step by step. Forexample, the exploitation of Seams at close range, that has become the subject of coal mining.Different coal forming conditions will prepare to different conditions of the coal at close range, whichmainly in the distance of the coal seam, the quality of the coal, minable thickness, and the roof and floorlithology. The mining of the coal will damage the floor of coal that is lower roof inevitably, affecting thecontinuity and integrity of the top plate, The roof is covered with waste rock which is caved by the top ofthe coal, and the coal pillar that the upper left stress the coal are mainly on the floor rock, which willchange lower coal roof structure and stress environment. Therefore compared with the single, the lowercoal seam mining has been more stress phenomenon on the new mines.It is necessary to research the stability and control technology of coal seams mining roadway, which inorder to guarantee safe and efficient production of coal enterprises, improve the recovery rate of coalresources.This paper takes Tao mine of Humeral Shanxi Energy Group Co., Ltd as research background. Thefailure characteristics of the gob Seams floor, floor strata distribution of stress in the lower coal miningroadway layout, roadway and related methods the parameters were analyzed with the methods oftheoretical analysis, numerical simulation, and verification combine instances, to solve the problems liketunnel roof will still be broken loose roof strata, poor integrity, and bearinging difficult situations when return roadway layout in reducing stress area.The conclusions in this thesis are: By theoretical analysis and calculation to determine the failurecharacteristics of Xing Tao4-1#coal mine gob floor; by theoretical analysis for the upper left seam of coalpillar stability, we find out the appropriate conditions of three arrangements that the external offset roadwaylayout type, the inner offset roadway layout type and the overlapping roadway layout type, it also gives theformula of external offset and inner offset. Combined with Xing Tao actual geological conditions, thegateway of4-2#identified within the inner offset roadway layout type. We studied the effect ofusing numerical simulation method.