Pan Yidong Coal Mine Of High Gas Coal Seam Coal Face Gas Source And Gas Governance Research

Huainan Mining Group Panyi Eastern1252(1) is the first mining face in the West face a panel seam11-2,13-1seam also face under a protective layer. Found a huge field of production of gas emission in the face, to110m3/min. In order to find a large amount of gas emission face reasons, to ensure1252(1) Face safe and efficient production, in-depth study of the face gas source, and then develop appropriate gas control program.In this paper, taking the theoretical analysis, laboratory experiments and field research methods industrial experiment of combining. The scene of the basic parameters11-213-1coal and coal seam gas were estimated gas content was measured and found11-2and13-1coal seam high pressure gas, coal seam permeability poor, highlighting the danger of two coal seams are high. On this basis, the use of source prediction method for1252(1) Gas Emission mechanized mining face to predict gas emission in case done on the face of macro control. In order to study1252(1) the process of face advance, roof fractured situation is similar in the laboratory simulation experiments, taken on an empty area overburden caving zone and fractured zone height, It was found along a fissure in the overburden has been developed to13-1seam roof, this separation fissure cracks in the main role of13-1in favor of unloading coal seams. At the scene, using the element method and the statistical method of gas emission face gas constitute estimates and analysis showed that face the wall and the gas comes mainly from coal mined-out area (including13-1relief seam gas), which accounted for gas Emission average ratio of75%down, close to the influx of pressure relief gas layer is a huge amount of gas emission face an important reason. Finally, according to the results of a similar simulation and research face gas sources, to develop the coal seam and goaf gas extraction while governance program, In addition to VAM back outside, take a rail transport layer Borehole cis eliminate sudden, ground drilling, pumping Lane Borehole bottom, roof to drilling, gas control means combining the filling pipe wall, pumping mining rate of88%, back to the romantic in gas concentration remained at around0.35percent, face and upper corner overrun completely eliminate the phenomenon of gas concentration, gas control effect is remarkable. After1252(1) first mining face exploitation, within the scope of protection of the coal seam near13-1residual gas pressure0.47Mpa, the residual gas content of3.81m3/1, highlighting significant reduction in risk of first face exploitation as a protective layer made good effect.