高温作用下大理岩应力-应变全过程的试验研究

EXPERIMENTAL STUDY ON WHOLE STRESS-STRAIN COURSE OF MARBLE UNDER THE ACTION OF HIGH TEMPERATURE

采用液压伺服刚性岩石力学试验系统,研究了大理岩在常温至800℃高温作用下的应力-应变全过程特性,比较系统地分析了高温作用对大理岩的刚度、峰值强度、峰后特性及残余强度等的影响。试验结果表明:随着温度升高,岩石总体刚度、单轴强度降低表现出明显的软化特性,峰后特性及残余强度宏观上表现出由脆性向塑性的渐次演化。这些结果一定程度上反映了大理岩在温度作用下,其内部结构变化的基本规律,对今后高温岩体工程有一定的实用参考价值。

The stress-strain behaviors of marble, under the action of temperature from normal temperature to high temperature of 800℃ have been investigated by hydraulic pressure servo rigidity rock mechanics experiment system. Influence of the high temperature on peak strength, post-peak characteristics, residual strength of marble have been systematically studied by comparing experimental results. It is shown that the total rigidity and uniaxias strength obviously decline as temperature becomes higher, and post-peak behaviors and residual strength manifest characteristics of transforming from brittleness to plasticity. The results reflect the fundamental regulation of marble's interior structure changing under action of different temperature, which provides reference to high temperature rock project in practice hereafter.