不同高温循环次数后大理岩单轴压缩力学试验研究

采用岩石单轴压缩试验分别对经历100℃、300℃、450℃、600℃四种温度与1次、10次、20次不同温度循环次数后的的四川锦屏大理岩试样的力学性质进行了研究。试验结果表明:1100℃下高温循环次数对应力应变曲线形状的影响不大,当温度达到450℃以上时,高温循环次数对曲线曲率等参数的影响较大;2随着温度的升高和循环次数的增加,试样破坏形式逐渐由典型的脆性破坏向脆塑性破坏转变;3当温度达到600℃时,随循环次数增加,峰值应力、弹性模量表现出明显的降低趋势,峰值应变表现出明显的升高趋势。

Uniaxial compression tests on mechanical properties of marble after undergoing different numbers of temperature cycling

Uniaxial compression tests were conducted in this study to examine the mechanical properties of marble rocks that had undergone different high temperatures and different cycle numbers of temperature variation. Rock samples were taken from Jinping in Sichuan. Temperature was varied in four ranges separately with the upper bounds at 100, 300, 450, and 600 ℃, and three cycle numbers of 1, 10 and 20 were used. The results show that, for temperature cycling at the bound of 100 ℃ cycle number had little effect on the shape of stress-strain curve while the effect became significant when the temperature upper bound reaches up to 450 ℃. And, as both temperature and cycle number were increasing, damages in the samples started to shift gradually from the typical form of brittle failure to that of brittle plastic failure. For the tests after undergoing temperature cycling at the bound of 600 ℃, increasing the number of cycles resulted in a descending trend in peak stress and elastic modulus and an ascending trend in peak strain.