Drilling Gas And Extraction By Floor Wearing Layer In ZhangJi Coal

Drilling gas and extraction by fool wearing layer is a kind of important ways for solving the coal gas. Aiming at 13-1 coal of ZhangJi for This paper taking out the coal gas beforehand. It is analyses drilling gas and extraction by fool wearing layer from the theoretically mechanism. Tested the basic parameters of 13-1 original coal. Established the layout model for the drill hole in layer. Through the COMSOL Multiphysics simulation software to get the numerical simulationfloor for the drilling reasonable spacing of the floor wearing layer extraction gas. When the two single drilling apart 5 metre, the drainage range of the drilling just appear "tangent" state. pitch-row the most reasonable. Using gas flow method to study the extraction radius which Smoking rate gets extraction period more than 30%, and through the method of measurement field, receiving the effective extraction radius. Theory and practical combined, using borehole layout mode 5m x 10m grids for ZhangJi Coal Mine floor wearing layer drilling layout to optimization.Efficiently solve the problems of Coal roadway excavation tunneling orifices, top drilling, gas overrun. Fully explain the rationality of extraction radius and drilling spacing layout.Sampling the coal briquette from the coal seam what had taked out.It was analysed the prominent index parameters of coal for industrial. no more than the outburst provisions critical point. Proof the prevention measures effectiveness of outburst for the regional. Thus successfully coal roadway excavation, ensure the cover of safety production in coal mine.