多裂纹岩石单轴压缩渐进破坏过程精细测试

FINE TEST ON PROGRESSIVE FRACTURING PROCESS OF MULTI-CRACK ROCK SAMPLES UNDER UNIAXIAL COMPRESSION

综合运用声发射定位技术的灵敏性以及CT技术的直观性等特点,实现对多裂纹岩石单轴压缩渐进破坏过程的精细测试。通过分析加载过程中声发射定位事件、CT扫描切片以及CT数的变化,获取多裂纹岩石裂纹扩展破坏过程。加载之初,岩石试件虽总体上表现为裂纹压密,但局部仍可追踪试件内部原生裂纹起始扩展,并随载荷增加向两端逐渐扩展、渐进破坏直至形成贯通破裂面。为探索岩石微细观破坏机制和裂纹扩展演变规律,推进岩石力学试验可视化技术的发展奠定基础。

By using integrally the sensitivity features of acoustic emission location technology and the computerized tomography（CT） technology, the fine test on progressive fracturing process of jointed rock under uniaxial compression is realized. By analyzing the positions of acoustic emission events, the CT slides and the change of CT number, the cracking propagation process is achieved. At the beginning of loading, although the whole jointed rock sample shows of crack compaction, the initial crack extension can be localized in the partial area. With the load increasing, both sides of the cracks extend gradually, and they will be destroyed progressively until to form a fracture plane finally. The results can lay the foundation for exploring micro-damage mechanism and the crack expansion discipline of rock, and it will also promote the development of visualization technology for rock mechanics test.