Experimental Study of Mechanical Properties of Coal Rock Containing Gas Under Uniaxial Compression

Based on the design of the test plan for uniaxial compression of coal containing gas,the uniaxial compression test of coal rock containing gas is carried out by the test system of MTS 815.The results indicate that 1) the designed test plan can meet the test requirements of mechanical properties of coal rock containing gas under uniaxial compression;2) the piecewise characteristic of complete stress-strain curve is very obvious except for the situation in compression phase;the coal rock shows much more brittle failure because of gas in it;3) the relation between volumetric strain and stress is complex in uniaxial compression of coal process,contained three phases;and 4) the damage equation of coal rock sample containing gas is retrogressed and obtained on the base of test results.