高温下岩石力学性质的数值试验研究

Numerical tests on mechanical properties of rock at high temperature

考虑岩石细观组构的不同,采用随机非均匀介质热弹性力学模型和有限元分析方法。进而,仅考虑热膨胀系数为随机介质,在平面应变模型下,并进行了岩石热破裂的数值试验,以花岗岩为样本,对均匀分布、正态分布、韦泊分布等三种随机分布下弹性模量和泊松比引起的岩石破裂门槛温度值的变化作了详细研究,揭示了弹性模量和泊松比对岩石热破裂门槛温度值TC的变化规律。

Considering the difference in micro-structure of rock, using random non-homogeneous thermal elastic mechanics model and FEM, and further considering thermal expansion coefficient is random media only, under plane stain model, numerical experiments are made on the rock thermal cracking. Under the three random distributions （Uniform, Gauss and Weibull ）, researches are carded out on the changing of hot cracking threshold temperature of rock with elastic modulus and Possion＇s ratio. The article shows the relationship between thermal cracking threshold temperature Tc and elastic modulus and Possion＇s ratio.