温度对砂岩损伤影响试验研究

 以砂岩试件为研究对象，研究该批试件高温前后的均匀性、高温后的超声波传播规律及孔隙率变化规律。通过研究高温后砂岩的超声波速变化、孔隙率变化规律，得到了温度对砂岩损伤的影响规律。结果表明，除温度为200 ℃时，超声波速略有升高外，随着砂岩经历温度的升高，超声波在其内部的传播速度逐渐降低，孔隙率随经历温度的升高而逐渐变大；这两个事实都说明砂岩经历高温后内部产生了损伤。建立了超声波速与损伤因子的关系，并且得到该砂岩随经历温度的升高损伤因子逐渐增大的规律。

EXPERIMENTAL STUDY ON EFFECT OF TEMPERATURE ON SANDSTONE DAMAGE

Sandstone specimen is adopted to conduct test，and all of the homogeneity of specimen and the law of ultrasonic wave and porosity are studied before and after high temperature. Through the experimental study on the law of ultrasonic wave and porosity，the law of effect of temperature on sandstone damage is obtained. The result shows that the ultrasonic velocity increases except when the temperature is 200 ℃；the ultrasonic velocity will decrease when the temperature increases；the porosity will increase as the temperature increases. The two facts show that sandstone specimen is damaged after high temperature. The relation between ultrasonic velocity and damage factor is obtained，and the damage factor will increase as the temperature increases.