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工程力学  2014 

高温后大理岩力学性质及其破坏规律研究

, PP. 189-196

Keywords: 高温,大理岩,力学特性,破坏规律,振铃计数

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Abstract:

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。

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