不同初始损伤白砂岩高温处理后的力学性能研究

通过进行不同初始损伤程度白砂岩在不同等级高温处理后的力学试验,分析了温度和初始损伤对白砂岩的杨氏模量、峰值应力和显微结构等方面的影响。试验结果表明:随着温度的升高,受到初始损伤的白砂岩试件的杨氏模量和抗压强度都呈下降的趋势,初始损伤越大,高温对白砂岩造成的影响越大。通过显微镜观察到随着温度的升高,试块的晶体变小,颗粒的破坏更为破碎,岩屑更多。此外,通过对试验数据的整理,建立了不同初始损伤等级和不同温度等级下白砂岩的本构关系曲线。

Study on mechanical property of white sandstone with different initial damages after treatment of high temperature

Through the mechanical test of white sandstone with various degrees of initial damage after treatment of different high temperatures,the paper analyzed the influence of different target temperatures and initial damage on elastic modulus, peak stress and microscopic structure.The results show that elastic modulus and compressive strength of white sandstone affected by initial damage decrease with the increase of temperature.The greater the initial damage, the severer the impact of high temperature on white sandstone.Through the observation by using microscope,the crystal of specimen becomes smaller and incomplete,cuttings is more.In addition,the paper set up the stress-strain curves of white sandstone with different initial damages and temperatures.