摘要
采用清华大学带扫描电镜的岛津SEM高温疲劳试验机系统,对高温作用下石灰岩在单向压缩和单向拉伸加载的细观结构进行了实时试验研究,探讨了岩石热损伤演化过程和热裂纹扩展、破坏特征,建立了岩石热裂纹生长的损伤模型,结合试验结果和利用位错、扩散蠕变的概念,分析了岩石热损伤变形的破坏机制。结果表明在500℃范围内的温度作用下产生的热裂纹主要为晶间裂纹。
Under uniaxial compressive and tensile loading, limestone＇s meso-structure has been investigated by real-time under high temperature with advanced experiment instruments such as High Temperature Fatigue Testing System with Scanning Electron Microscope in Tsinghua University. Thermal damage evolution process, thermal crack growth and fracture characteristic of rock are discussed. The damage model of rock thermal crack growth is established. Combining test results with the concept of dislocation and diffusion creep, thermal damage deformation fracture mechanism of rock are researched. The results show that the thermal crack is intercrystalline crack mainly within the scope of 500 ℃.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2007年第5期1021-1025,共5页
Rock and Soil Mechanics
基金
国家重点基础研究发展规划973项目(No.2002CB412705)
创新群体项目(No.50221402)
关键词
石灰岩
温度
热损伤
破坏机制
limestone
temperature
thermal damage
fracture mechanism
