Strength and deformation behaviors of veined marble specimens after vacuum heat treatment under conventional triaxial compression

摘要

The mechanical behaviors of rocks affected by high temperature and stress are generally believed to be significant for the stability of certain projects involving rocks,such as nuclear waste storage and geothermal resource exploitation. In this paper, veined marble specimens were treated to high temperature treatment and then used in con-ventional triaxial compression tests to investigate the effect of temperature,confining pressure,and vein angle on strength and deformation behaviors.The results show that the strength and deformation parameters of the veined marble specimens changed with the temperature, presenting a critical tem-perature of 600?C. The triaxial compression strength of a horizontal vein(β =90?)is obviously larger than that of a vertical vein (β = 0?). The triaxial compression strength, elasticity modulus, and secant modulus have an approx-imately linear relation to the confining pressure. Finally, Mohr–Coulomb and Hoek–Brown criteria were respectively used to analyze the effect of confining pressure on triaxial compression strength.