Abstract: In this paper, taking coal samples in Fangshan Coal Mine, Henan as research object, the self developed “Loaded coal containing gas triaxial loading seepage experiment device” was used to conduct the loading-unloading confining pressure triaxial seepage experiments under the condition of different moisture contents, and to analyze the influence law of moisture and loading-unloading confining pressure on the seepage characteristics of coal mass containing gas. The results show that: 1) Confining pressure and moisture content of coal sample have strongly control ability to the permeability of briquette, while the permeability is correlated negatively with the moisture and confining pressure. 2) In the two loading processes, the permeability variation in the second loading process is gentler, and the relation between permeability and confining pressure curve path is different. 3) During the two unloading processes, the permeabilities increase to some extent, but can’t recover to the initial value. The higher the moisture content is, the smaller the recovery degree is. 4) During the same loading or unloading process, the permeability of coal sample with higher moisture content changes more gently. After the first loading, during the first unloading and the second loading-unloading processes, the control ability of moisture content in the permeability of coal sample is much higher than that of the confining pressure. Experimental conclusions can provide reference to the choice of the main control factors to gas permeability in coal seam under the repeated loading-unloading conditions.

Key words: seepage characteristics, coal containing gas, moisture content, permeability, loading-unloading confining pressure