水-热-力作用下千枚岩力学特性的试验研究

onventional triaxial compression test is the main means of understanding the mechanical properties of rocks in a complex environment. The study is phyllite samples from Gaoligongshan tunnel triaxial compression test under different conditions (confining pressure 20MPa, water pressure range from 4MPa to 10MPa, temperature range from 20 ℃ to 80 ℃). It is shown in this study that in the function of THM coupling, as the temperature increases, the triaxial compressive strength of phyllite reduce and elastic modulus increase; as the pore water pressure increases, the peak strength and elastic modulus decreases, the stress-strain curve have long plastic deformation stage behind yield point under high pressure conditions, which shows the apparent dilatancy behavior and the samples tend to ductile failure. It gets multiple strain-permeability curves by the permeability test in each set of tests complete stress-strain process so that recognizes the evolution of permeability of phyllite in process of deformation and failure. It is suggested that the micro-cracking mechanism of phyllite is dilative shear failure under the function of THM coupling by SEM analysis of typical fracture of failure samples.