Coupled thermo-mechanical constitutive damage model for sandstone

Underground rock dynamic disasters are becoming more severe due to the increasing depth of human operations underground. temperature and pressure conditions contribute significantly these disasters. Therefore, it is important understand coupled thermo-mechanical (TM) behaviour rocks for long-term safety maintenance underground tunnelling mining. Moreover, investigation damage, strength failure characteristics under triaxial stress avoid In this study, based on Weibull distribution Lemaitre’s strain equivalent principle, a statistical TM constitutive model sandstone was established high conditions. The test results different were used validate model. proposed in good agreement with experimental up 600 °C. total damage decreased temperature, while increased confining pressure. model’s parameters can be calculated using conventional laboratory results.