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基于大理岩在常温至高温800℃后的力学试验结果,分析了高温后大理岩峰值强度、峰值应变、弹性模量、变形模量以及应力-应变全过程曲线等随温度的变化规律,同时采用岩石声发射仪与扫描电镜试验仪,对高温后大理岩破坏规律进行了探讨。结果表明:高温后大理岩试样高度和直径将变大,质量和密度减小,但在200℃时变化不明显;在常温至高温200℃后,大理岩的力学性质变化不大;高温400℃~800℃,大理岩峰值强度、弹性模量和变形模量随着温度的升高而减小,而峰值应变则变大,并且随着温度的升高,变化越明显;声发射试验得到的振铃计数与应力-时间曲线具有较好地对应关系,充分反映了岩石在不同阶段内的破裂演化规律;温度对大理岩的破坏规律有着显著影响,温度升高使大理岩由脆性破坏向延性破坏的方向发展。
Based on the mechanical test results of marble at 800 ℃ from room temperature to high temperature, the law of peak intensity, peak strain, elastic modulus, deformation modulus and stress-strain curve under high temperature were analyzed. Rock acoustic emission apparatus and scanning electron microscope tester, the damage of marble after high temperature was discussed. The results show that the height and diameter of the marble samples will be larger, the mass and density will decrease after high temperature, but the changes will not be obvious at 200 ℃. The mechanical properties of the marble will not change much after the temperature is up to 200 ℃. ℃ ~ 800 ℃, the marble peak strength, elastic modulus and deformation modulus decrease with the increase of temperature, but the peak strain becomes larger, and the change becomes more obvious with the increase of temperature. The acoustic emission test The ringing count and stress-time curve have a good correspondence, which fully reflects the rock's rupture evolution law in different stages; the temperature has a significant effect on the failure law of marble, and the temperature increases from brittle failure to Ductile damage in the direction of development.