Study on saturated permeability coefficient of remolded coal under different pressing loads

Abstract

In order to study the permeability characteristics of coal, remolded coal samples formed under different pressing loads were used. The saturated water content and saturated permeability coefficient of remolded coal samples were measured and analyzed by self-designed constant head permeability experimental device. The results show that: with the increase of pressing load, the total pore volume of remolded coal sample decreases gradually, and the proportion of micropores and small holes in the total pore volume increases gradually; the moisture content of each remolded coal sample first increases rapidly with time, then gradually increases slowly and tends to be stable. The saturated moisture content of remolded coal sample decreases with the increase of pressing load. The relationship between saturated moisture content and pressing load conforms to monotonic decline and has an extreme value function; the saturated permeability coefficient of remolded coal decreases with the increase of compaction load.

Keywords

• remolded coal
• saturated permeability coefficient
• porosity
• coal seam water injection
• pressing load