单轴压缩下基于全局应变场分析的岩石裂纹扩展及其损伤演化特性研究

 采用自主开发的图像分析软件结合数字图像相关技术对含预制单裂纹的类岩石材料在单轴压缩下的变形破坏特性进行试验研究。基于试件全局应变场角度从细观层次量化分析、总结裂纹起裂、扩展的规律及岩石变形损伤演化特征。并采用断裂分析软件FRANC2D/L对相似模型进行数值模拟，分析在加载全程不同阶段的裂纹扩展路径及其应力场分布特征。结合试验与数值研究结果，细致地探讨裂隙岩石的细观力学机制与宏观力学响应之间的内在联系，该研究有助于提升人们对节理岩体工程灾变机制的认识。

STUDY ON THE CRACK PROPAGATION AND DAMAGE EVOLUTION CHARACTERISTCIS OF ROCK BASED ON THE GLOBAL STRAIN FIELD UNDER UNIAXIAL COMPRESSION

Based on the self-developed digital image analysis software and the digital image correlation method，the deformation and failure characteristics of rock-like materials with pre-existing single flaw is experimentally studied under uniaxial compression. The law of crack initiation and propagation and the evolution properties of rock damage are analyzed and summed up quantitatively on meso-level from the perspective of the global strain field on the surface of specimen. Besides，FRANC2D/L，a fructure analysis software，is applied to a numerical model corresponding to the experimental specimen to simulate the path of crack growth and the corresponding distribution of stress field at different stages in the whole process of loading. Combining the results of experiment and simulation，the inner link between microscopic mechanical mechanism and macroscopic mechanical response of flawed rock is discussed，which provides a deeper understanding to the disaster mechanism of jointed rock mass engineering.