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采用MTS 810电液伺服材料试验系统对常温~800℃高温作用下大理岩的力学性能进行了研究,考察了大理岩的全应力-应变曲线、峰值应力、弹性模量等量的变化特征.结果表明:随受热温度升高大理岩的峰值强度和弹性模量不同程度上渐次降低,尤其是在不同温度段岩石强度降低具有突变性,800℃时大理岩的延性明显增强.基于岩石的应变强度理论和岩石强度的随机统计分布假设,采用损伤力学理论,考虑微元体破坏及弹性模量与温度之间的非线性关系,建立了单轴压缩下的大理岩损伤统计本构模型,给出了考虑温度效应大理岩损伤统计本构模型参数.通过与高温状态下单轴压缩实验结果相比较,显示了所建模型的合理性。最后探讨了温度对大理岩损伤特性的演化规律.
The MTS 810 electro-hydraulic servo material test system was used to study the mechanical properties of marble under normal temperature ~ 800 ℃, and the variation characteristics of marble, such as total stress-strain curve, peak stress and elastic modulus, were investigated. The results show that the peak strength and elastic modulus of marble decrease gradually with the increase of heating temperature, especially in the different temperature range, the ductility of marble increases obviously.According to the strain intensity of rock Theoretical and rock strength random statistical distribution hypothesis, using damage mechanics theory, taking into account the destruction of micro-bodies and nonlinear relationship between elastic modulus and temperature, established under uniaxial compression of marble damage statistical constitutive model, given The parameter of constitutive model of marble damage considering temperature effect is compared with that of uniaxial compression experiment at high temperature, which shows the rationality of the model. Finally, the evolution of the damage characteristics of marble is discussed.