热处理后白砂岩物理力学参数的变化规律

对热处理后的白砂岩进行了单轴压缩试验,分析了白砂岩应力峰值、纵波波速、弹性模量以及破坏形态随温度的变化规律,建立了白砂岩损伤变量与温度之间的关系式,分析了白砂岩损伤变量与物理力学参数之间的关系。研究表明:热处理后的白砂岩在某一温度范围内表现出一定的自愈性;热处理后白砂岩的物理力学参数与温度之间呈现二次非线性关系;热处理对白砂岩的破坏形态影响不大;热处理造成的损伤对白砂岩物理参数的影响大于对其力学参数的影响。研究成果对高温环境岩石工程的建设具有重要的参考价值。

Variation law of physical and mechanical parameter of white sandstone after heat treatment

The paper conducted the uniaxial compression test to white sandstone after heat treatment and analyzed the variation law of peak stress, longitudinal wave velocity, Young''s modulus and damage form of white sandstone with temperature,and established the equation between temperature and damage variables of white sandstone.It analyzed the relationship between the damage variable and mechanical parameters. The result shows that after heat treatment, white sandstone shows some self-healing within a range of temperature;the relationship between physical and mechanical parameters and temperature presents quadratic nonlinear law; the heat treatment has little effect on failure mode of white stone;the damage of heat treatment has more effect on physics parameter than that on mechanical parameter.The study results have important value for the construction of rock engineering in the circumstance of high-temperature.