受載含瓦斯煤滲流特性及其應(yīng)用研究
[Abstract]:Abnormal gas emission and coal and gas outburst accidents are dynamic disasters caused by instability and failure of coal body under multi-field coupling. As an index of the difficulty of gas flow in coal seam, permeability and multi-field coupling model of gas flow in coal seam are the most important and basic key issues in the study of gas migration in coal seam. In this paper, the seepage characteristics of coal samples under different pore pressures, different confining pressures, different effective stresses and different temperatures are studied by building an experimental apparatus for seepage characteristics of loaded gas-bearing coal bodies. The adsorption deformation is considered. On the basis of pore gas compression and temperature expansion change, the relationship equation between porosity and effective stress of loaded gas-bearing coal, the relation equation between permeability and effective stress, and the nonlinear seepage equation of gas in loaded coal body are established. Combining the original effective stress theory with the basic principle of damage mechanics, the deformation mechanism of loaded gas-bearing coal body is divided into three kinds under the influence of stress, pore pressure and temperature effect. According to the function of effective stress 蟽 e, the strain of coal body is the function of effective stress 蟽 e. The constitutive relation of stress-strain of gas-bearing coal is established, and the dynamic evolution model of permeability is established by combining the equation of permeability and effective stress. The stress-strain process of loaded gas-bearing coal is combined with the stress-strain process of coal around dynamic pressure roadway, and the loaded gas-bearing coal is regarded as viscoelastic-plastic softening medium. The formulas for calculating the radius of the ductile softening zone and the broken zone around the roadway are derived theoretically, and the seepage equation and fluid-solid coupling model of the coal body around the roadway considering the dynamic evolution of permeability are established. Combined with the research method of numerical simulation, the stress distribution and permeability change law of coal body around roadway under different conditions are analyzed. Through field verification, the field verification is obtained, and the theoretical analysis is basically consistent with the numerical simulation result.
【學(xué)位授予單位】:中國礦業(yè)大學(xué)(北京)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2013
【分類號(hào)】:TD712
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