关键词: 岩石, 高温, 纵波波速, 抗压强度, 损伤

Abstract: Based on the uniaxial compressive test, the variation laws of longitudinal wave velocity, failure modes, compressive strength and damage property of marble specimens while experiencing different temperatures among 25~1 000 ℃ were studied in this paper. The test results show that there are multiple splitting surfaces along the axial direction of marble after high temperatures, and the split failure mode is the main destructive manner of marble. Meanwhile, the compressive strength of marble increases visibly at 100 ℃and 400 ℃, and then presents deterioration with the increase of temperature after 800 ℃. When the temperature reaches to 1 000 ℃, the marble nearly losses bearing capacity. Moreover, the longitudinal wave velocity declines linearly and the damage increases linearly with the increase of temperature, which reflects the changes to internal nature of marble after the high temperature effects. Rock mass is aggregated with mineral components together, thus, the changes of mineral components under high temperatures, to some extent, can affect the physical and mechanical characteristics of rock mass.

Key words: rock mass, high temperature, longitudinal wave velocity, compressive strength, damage