Study Of Characteristic Of Electromagnetic Wave Field In The Coal And Gas Outburst Orientation

Coal and gas outburst is one of the main disasters in coal mines. With the mining depth increasing, the dangerous regions expand and some non-outburst mines become the outburst dangerous mines .Therefore, to forecast the coal seam outburst danger is the decisive link to guarantee outburst dangerous coal seam safe and highly effective production. Through the reliable outburst danger forecasting to differentiate the non-outburst dangerous region best, to guarantee the coal mine safe production, to guard the technical measure against the outburst a clear goal, to liberate productive forces, to save the expense as well as enhance the mine the economic efficiency ,it has the vital role and the significance.The forecasting the coal and gas outburst orientation provides an effective technology way for preventing the gas outburst. The electromagnetic propagation characteristic in coal and rock mass with gas provides the precursor information of coal and gas outburst, which may forecast the coal and gas outburst. The working face advancing arousing the stress field change in the front coal mass, which necessarily leads to changes of electrical parameter in the coal and rock mass, combining the electromagnetic wave propagation rules in coal and rock mass acted by the previous supporting press, the coal and gas outburst mechanical model was set up. Combining the geological physical and mechanical parameters about the coal and gas outburst in the specific working face, using the universal distinct element method to calculate coal and rock mass destruction spatial distribution and stress field distribution; and according to stress electricity coupling model, using electromagnetic computerized tomography technology to inverse the electromagnetic wave field characteristic in the working face with coal and gas outburst orientation.Finally, through the test of electromagnetic wave CT detecting structure coal, it further proved electromagnetic wave computerized tomography technology predicting the outburst feasibility at practice.