Abstract：
Based on laboratory tests, the variation laws of several mechanical factors of rock specimens (sandstone) from the Shihuoshan tunnel of Xinjiang were studied, including the wave velocity, mass, triaxial compressive strength, uniaxial compressive strength and elasticity modulus with burning temperatures of 400℃ , 600℃ , 800℃ and 1 000℃. The results show that: 1) the wave velocity changes little for temperatures less than 400℃, while it decreases under temperatures more than 400℃, especially between 400℃ and 600℃; 2) the relationship between the triaxial compressive strength and burning temperature/confining pressure is complex and the variation laws of the triaxial compressive strength and its relevant parameters are different under the critical temperatures just below or above 800℃; 3) the uniaxial compressive strength increases with an increase of temperature when the temperature is below 600℃, while it decreases when the temperature exceeds 600℃.
2016, Vol. 53 