温度对岩石强度及损伤特性的影响研究  

Temperature effect on strength and damage property of rock mass

作　　者：刘石[1] 许金余[1,2] 刘志群[3] 支乐鹏[1] 陈腾飞[1] 

机构地区：[1]空军工程大学机场建筑工程系,陕西西安710038 [2]西北工业大学力学与土木建筑学院,陕西西安710072 [3]空军工程大学校务部营房处,陕西西安710038

出　　处：《采矿与安全工程学报》2013年第4期583-588,共6页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51078350)

摘　　要：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。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 dif-ferent 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 fail- ure mode is the main destructive manner of marble. Meanwhile, the compressive strength of marble in- creases 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 tempera-ture 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 character-istics of rock mass.

关 键 词：岩石 高温 纵波波速 抗压强度 损伤 

分 类 号：TU452[建筑科学—岩土工程]