通过单轴压缩试验,对经历不同温度(25~1 000℃)后大理岩的纵波波速、抗压强度、破坏形态以及损伤特性随温度的变化规律进行研究。试验结果表明:高温后大理岩破坏时,沿轴向存在多个劈裂面,主要体现为劈裂破坏的模式;单轴抗压强度在100℃和400℃时有2次强化作用,从800℃左右,抗压强度开始急剧下降直至1 000℃时,基本失去了承载能力;随着加热温度的升高,大理岩试样的纵波波速近似线性下降,损伤因子近似线性增加,反映了大理岩经历高温作用后内部性质的变化;岩石是由不同矿物组成的多晶体,高温环境下各种矿物性质的变化,在一定程度上影响着岩石高温后的物理力学性质。 Through the uniaxial compression test, the longitudinal wave velocity, compressive strength, failure mode and damage characteristics of marble under different temperatures (25 ~ 1 000 ℃) were studied. The results show that there are multiple cleavage planes along the axial direction when the marble is destroyed at high temperature, which is mainly manifested as splitting failure mode. The uniaxial compressive strength has two strengthening effects at 100 ℃ and 400 ℃, ℃, the compressive strength began to decline sharply down to 1 000 ℃, and almost lost its bearing capacity. With the increase of heating temperature, the longitudinal wave velocity of marble samples decreased linearly and the damage factor increased approximately linearly, reflecting that the marble After experiencing high temperature, the internal property changes. Rocks are polycrystals composed of different minerals. The changes of various mineral properties under high temperature environment affect the physical and mechanical properties of rocks at high temperature to a certain extent.