Abstract: Taking raw coal as object， by using self-made “thermal-hydro-mechanical coupled with triaxial servo-controlled seepage apparatus for containing-gas coal”， the effect of temperature on the mechanical properties of containing-gas raw coal was studied under constant confining pressure and unloading confining pressure. The results showed that: 1) Under the same initial confining pressure， gas pressure and temperature， compared with the constant confining pressure， the yield stage of the coal under unloading confining pressure is shortened. Besides， its peak stress and associated axial strain decrease， the transverse strain rate increases， and the evolution processes of its lateral expansion ratio and deformation modulus are accelerated. 2) Under the same initial confining pressure and gas pressure， with the increase of temperature， the strength of coal under unloading confining pressure decreases， the axial strain at peak stress， the absolute value of the transverse strain and volumetric strain decrease， and the lateral expansion ratio and the deformation modulus increase. 3) The risk of coal unstable failure and coal and gas outburst becomes higher under high temperature environment， leading to more strict requirements for the support of coal face roadway and the control of coal and gas outburst.

Key words: mining-induced mechanics, unloading confining pressure, complete stress-strain, temperature, raw coal