岩石高温作用后静态力学性能研究

Study on Static Mechanical Properties of Rock Subjected after High Temperature Action

本文应用静态力学试验装置及加热装置,对加热到不同温度且冷却后的岩石试件进行静态力学试验。静态力学试验分析表明,随着试件加热温度的提高,砂岩的单轴抗压强度整体呈下降趋势,400 ℃为一个转折点,400~600 ℃下降幅度较大;从砂岩抗拉强度来看,随着温度的上升,常温至400 ℃有轻微波动,同样400 ℃为转折点,400~600 ℃有明显下降。总体来看,砂岩抗拉强度及抗压强度在常温至400 ℃波动变化且变化幅度较小,400 ℃为其一转折点,抗拉强度及抗压强度均在400~600 ℃下降幅度较大,呈明显的下降趋势。

In this paper,the static mechanical test device and the heating device are used to conduct static mechanical test on the rock specimens heated to different temperatures and cooled.The static mechanical test analysis shows that with the increase of the heating temperature of the specimen,the uniaxial compressive strength of the sandstone shows a downward trend as a whole,400 ℃ is a turning point,and the decrease is larger at 400~600 ℃;from the point of view of the tensile strength of sandstone,with the increase of temperature,there is a slight fluctuation from normal temperature to 400 ℃,similarly,400 ℃ is the turning point,and there is a significant decrease at 400~600 ℃.In general,the tensile strength and compressive strength of sandstone fluctuate from room temperature to 400 ℃,and the change range is small,400 ℃ is a turning point,and the tensile strength and compressive strength both decrease greatly at 400~600 ℃,showing an obvious downward trend.