Sensitivity Test Study on Influencing Factors of Coal Containing Methane Permeability

The seepage test of coal containing methane with different moisture content is carried out by the triaxial methane seepage test device. It reveals some new insights into the permeable rate of methane that has been affected by many factors. Under different conditions, the permeability of coal containing methane with axial pressure increases with the increase of axial compression. At the same time, it is found that the permeability of coal with lower moisture content is stronger with the change of axial pressure. The influence law of temperature on the permeability of coal containing methane is associated with peripheral restraint stress (confining pressure). When the external constraint stress is small, the thermal stress caused by temperature is dominant, and the permeability of coal expands with the increase of temperature; on the contrary, the external constraint stress is dominant, and the coal body is compacted inward, and its permeability decreases with the increase of temperature. When the external constraint stress is small, the higher the water content, the more sensitive the permeability is to temperature.