China is a country with coal as its main energy source. The coal gas generated during coal mining is both a harmful gas and a clean energy source. How to effectively extract gas has become an important issue in the production of high-gas coal mines in China, and the study of the gas-solid coupling mechanism of coal and gas is an important theoretical basis for efficient gas extraction. At present, research in this area at home and abroad, in order to simplify the calculation of multi-hypothetical coal isotropic material and gas participation in the migration with isotropic percolation, in fact, coal in nature has significant anisotropic characteristics, so the above study can not be completely Reflect the coal and gas gas-solid coupling real engineering and indoor test actual conditions.
Dr. Yanxian Xian, a Ph.D. student under the guidance of Yang Diansen, a researcher at the Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, carried out a desorption-diffusion-infiltration experimental study of gas and deduced the gas-solid coupling equations of anisotropic coal under different mechanical boundaries. Model numerical verification. The results show that the proposed gas diffusion model with lag diffusion can be used to quantitatively describe the characteristics of adsorption and adsorption rates in the process of desorption of coal. The coal anisotropy permeability model is proposed and reflects the results of the coal penetration test. A coal-rock gas-solid coupling model was established to reveal the mechanism of coal deformation and infiltration during understanding, adsorption and extraction. The research results systematically studied the law of coal seam deformation and gas migration in the anisotropic gas-solid coupling process, which can provide reference and reference for the coalbed methane development project.
The above work was funded by projects of the National Basic Research Program “973†Project (2015CB057906) and the National Natural Science Foundation of China (No.51379200, 51225902).
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