岩土力学2012，Vol.33Issue(11)：3237-3242,6.
单轴压缩下高温后砂岩的声发射特征
Acoustic emission characteristics of sandstone after high temperature under uniaxial compression
摘要
Abstract
The acoustic emission evolution process of Jiaozuo sandstone with 20 ℃-1 200 ℃ temperatures is studied using acoustic emission (AE) test under uniaxial compression. By analyzing AE parameters and the mechanical properties of sandstone after high temperature, the AE characteristics of sandstone under different temperatures and different loading stages are explored. The results show that temperature has little effect on the acoustic emission of sandstone when temperature is less than 400 ℃. The AE ring-down accumulation counts change rapidly both at about 100 °C and 600 ℃ temperatures. It is shown that 100 ℃ is the threshold of crack growth for sandstone; and the internal structure composition of sandstone changes after 600 ℃; and acoustic emission phenomenon is very obvious. From 600 ℃ to 1 200 ℃, obvious brittle-plastic transition appears in sandstone. At the same time, the emergence of acoustic emission signals is delayed and the growth rate of acoustic emission signals rises because of high temperature. Sandstone releases intensive acoustic emission signals and presents plastic failure characteristics after 1 200 ℃.关键词
高温/砂岩/单轴受压/声发射Key words
high temperature/ sandstone/ uniaxial compression/ acoustic emission分类
建筑与水利引用本文复制引用
吴刚,王德咏,翟松韬..单轴压缩下高温后砂岩的声发射特征[J].岩土力学,2012,33(11):3237-3242,6.基金项目
国家自然科学基金项目(No.40872180) （No.40872180）
中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金项目(No.SKLGDU EK1004). （No.SKLGDU EK1004）
