Abstract:
Using self-designed CSCG-160 gravity type hydraulic dead load creep seepage system, we carry out the creep and seepage characteristic experiment of coal sample, and study deformation and seepage characteristics in coal creep process, and compare and analyze the experimental results and numerical simulation results. The results show that coal rock creep characteristics are obviously; when the creep load is small, the coal and rock shows attenuation creep, and coal and rock has three typical creep stages under high creep stress level; sample of coal and rock circumferential strain increases with the increase of axial strain, and volumetric strain shows a trend of first increase and then decrease with the increase of axial strain; the variation of coal and rock permeability with time is consistent with the change trend of coal rock creep test curve, and the permeability of coal rock increases with the increase of creep load level; the permeability of coal rock creep process increases with the increase of axial strain, and the rate of permeability increases with the increase of axial strain.