中文摘要：

The pore structure and gas adsorption property of deformed coal with different degrees of metamorphism weretested by low-temperature nitrogen adsorption and isothermal adsorption experiments. The fractal theory and the Langmuiradsorption theory were used to analyze the experimental data. The test results showed that the deformed coal had more heterogeneouspore structures and open pores, and its specific surface area （SSA） and fractal dimension （D） were higher. Thereis a polynomial relationship between D and specific surface area as well as gas adsorption capacity （VL）. The gas adsorptioncapacity of deformed coal is influenced by pore structure, coal rank, deformation and stress together, among which the porestructure is the main influencing factor for the adsorption capacity of deformed coal. The test pressure could affect the accuracyof the adsorption constants a and b, so the highest experiment pressure should be greater than the actual pressure ofcoal seam in order to reduce the deviation of adsorption constants.

英文摘要：

The pore structure and gas adsorption property of deformed coal with different degrees of metamorphism weretested by low-temperature nitrogen adsorption and isothermal adsorption experiments. The fractal theory and the Langmuiradsorption theory were used to analyze the experimental data. The test results showed that the deformed coal had more heterogeneouspore structures and open pores, and its specific surface area （SSA） and fractal dimension （D） were higher. Thereis a polynomial relationship between D and specific surface area as well as gas adsorption capacity （VL）. The gas adsorptioncapacity of deformed coal is influenced by pore structure, coal rank, deformation and stress together, among which the porestructure is the main influencing factor for the adsorption capacity of deformed coal. The test pressure could affect the accuracyof the adsorption constants a and b, so the highest experiment pressure should be greater than the actual pressure ofcoal seam in order to reduce the deviation of adsorption constants.