单轴压缩岩石损伤扩展细观机理CT实时试验

CT Real－time testing on damage propagation microscopic mechanism of rock under uniaxial compression

利用最新研制的CT机专用加载设备，完成了单轴压缩荷载作用下岩石细观损伤扩展特性CT实时试验。得到了清晰的岩石破坏全过程中微孔洞被压密，微裂纹萌生、发展、贯通破坏和卸荷等不同发展阶段的CT图像。基于岩石损伤扩展的细观机理，将岩石应力－应变全过程曲线分为5段，为岩石损伤本构模型的建立提供了重要基础。结果表明，利用这套设备进行岩石细观损伤力学特性的研究是可行的。

The computerized tomography(CT) real-time testing of rock microscopic damage propagation using the newest special purpose loading epuipment for the CT machine under uniaxial compression loading was accomplished. Through CT scanning, clear CT images were obtained. The images include the whole process of rock failure from the micro-hole compaction, growth, bifurcation, development, fracture, rock failure to unloading stage under the different stress states. Based on the microscopic mechanism of damage propagation of rock, the stress-strain complete process curve is divided into 5 sections, which provides an important base for establishment of the damage constitutive model of rock. Using this equipment to study the characteristics of rock microscopic damage mechanics is feasible.