高温后花岗岩力学性能的试验研究

TESTING STUDY ON MECHANICAL PROPERTIES OF POST-HIGH-TEMPERATURE GRANITE

对经历不同高温后花岗岩的力学性能进行了试验研究,分析了花岗岩应力-应变曲线、峰值应力、峰值应变、弹性模量和泊松比等的变化情况。研究结果表明,经历400℃以内的高温后,温度对花岗岩的力学性能的影响不明显。但经历的温度超过400℃后,随受热温度升高花岗岩力学性能迅速劣化,花岗岩峰值应力(或强度)和弹性模量急剧降低,而峰值应变迅速增长。高温后花岗岩泊松比随经历高温的增加而呈减少趋势。

Testing study is made on the mechanical properties of granite after undergoing different high temperatures. The mechanical properties include stress-strain curve, peak stress, peak strain, modulus of elasticity and Poisson's ratio of granite. The results show that the temperature does not obviously affect the mechanical properties of granite in the temperature ranging from room temperature to 400°C. But the mechanical properties deteriorate rapidly with the increase of temperature when the temperature is above 400°C. In this case, the peak stress or the strength and modulus of elasticity decrease rapidly, the peak strain increases rapidly, and the Poisson's ratio presents a tendency of decreasing as the temperature increases.