A new method of calculating gas content in coal seam influenced by in-situ stress grads and ground temperature

Considering the influence of in-situ stress grads and ground temperature on the porosity of coal and the coalbed permeability and the characteristic of adsorption parameter (b) changing with temperature in deep mining coalbed, and on the basis of the analytic formulas of calculating coalbed gas pressure in deep mining, the paper puts forward a new method of calculating gas content in coal seam. Meanwhile, the contrast and analysis of the measuring results of coalbed gas pressure and the theoretically computing results of coalbed gas pressure and gas content in coal seam indicate that the computing method can well reflect the authenticity of gas content in coal seam and further perfect the computing method of gas content in coal seam in theory, and have important value in theory on analyzing gas content in coal seam and forecasting distribution law of gas content in coal seam in deep mining.