[1]梁书锋,方士正,韦贵华,等.高温作用后硅质砂岩力学性能试验[J].郑州大学学报(工学版),2021,42(03):87.
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高温作用后硅质砂岩力学性能试验()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
42
期数:
2021年03期
页码:
87
栏目:
出版日期:
2021-05-10

文章信息/Info

作者:
梁书锋 方士正 韦贵华 朱现磊 李炜煜 马健起
文献标志码:
A
摘要:
为了研究高温作用后硅质砂岩的力学性质,采用三轴压力试验机,对常温(25℃)、200℃、400℃、600℃和800℃温度作用下的硅质砂岩试件进行单轴压缩试验,同时利用声波测试仪测量不同温度作用后硅质砂岩试件的超声波波速,分析了岩石强度和变形特征及岩石波速随温度的变化规律。结果表明:高温对岩石成分有显著影响,进而导致岩石纵波波速、抗压强度及破坏形式的改变,单轴抗压强度随岩石经历温度的升高而降低,并且在400℃时发生明显的转折,呈现出折线型变化趋势,岩石的纵波波速及破坏时的峰值应变也同样在400℃时开始出现增大趋势。引入热损伤因子D1,分析得出该损伤因子与温度之间呈三次多项式函数关系。
Abstract:
To study the effect of high temperature on rock , siliceous sandstone was selected to study the physical and mechanical properties after high temperature treatment,and the high temperatures ranged from 200 ℃ to800 ℃. In addition ,samples at room temperature (25 ℃) were set as the control group. The effects of high temperature on rock were evaluated by mineral composition analysis , longitudinal wave velocity , uniaxial compressive strength change and failure morphology. It was found that high temperature had a significant effect on the rock composition,which led to changes in rock wave velocity ,strength and failure mode. The strength decreased with the temperature increased, and a tuning point occured at 400 ℃. The longitudinal wave velocity and peak strain at the rock failure also changed significantly at 400 ℃.To further study the influence of high temperature on the rock , the thermal damage factor DT , was introduced to establish the relationship of thermal damage and the rock strength. There is a three order polynomial function relationship between DT and high temperature.
更新日期/Last Update: 2021-06-24