【摘要】 采用高精度微地震监测技术,结合岩石力学理论进行分析,得到了特厚煤层综放工作面采场围岩破裂规律。根据综放采场瓦斯运移规律和工作面超前煤体的百米钻孔瓦斯自然涌出量的现场实测,确定了导致工作面超限的瓦斯主要来自于采空区,给出了可抽放瓦斯的范围。通过分析岩层运动规律与工作面瓦斯浓度变化规律,证明工作面瓦斯的涌出主要受高位岩层周期运动的影响。更多还原

【Abstract】 Using the underground high precision microseismic monitoring system,analyzed the gas emission laws,combining rock mechanics and rock pressure theory,extra-thick coal seam of the top-coal caving face rock movement and the relationship between gas emission were studied.Monitoring results show the distribution laws of three-dimensional fracture and the movement of strata,thus the reasonable scope of gas drainage can be pointed out.Meanwhile,natural gas emission measurement of the 100 meters drilling site show that a large number of overrun gas mainly transfer from the goaf area.Comparative study on rock movement and the gas concentration changes show that face gas emission is primarily affected by the periodic fracture of the high altitude roof.更多还原