【摘要】 设计基于扫描电镜(SEM)的岩石破裂全过程数字化细观损伤力学试验方案,实现了岩石破裂全过程的显微与宏观实时的数字化监测、控制、记录及分析的岩石力学试验。应用于四川锦屏大理岩预制裂纹试样中进行单轴压缩破坏全程的数字化试验,对微裂纹的萌生、生长及贯通过程进行数字化定量分析,得到试样在受荷过程中微裂纹的面积、方位角、长度、宽度和周长基本几何数据,从宏细观角度描述了岩石试样单轴压缩过程中的破坏机制,并分析得出试样单轴受压破坏过程中虽然微裂纹在某些区域集中,但在整个试样中微裂纹的统计分布依然是服从某一指数分布的这一结论。试验研究结果证明了该试验方案的科学性和先进性。更多还原

【Abstract】 A new meso-mechanical testing scheme based on SEM is developed to carry out the experiment of microfracturing process of rocks. The image of microfracturing process of the specimen can be observed and recorded digitally. The microfracturing process of Jinping marble specimen in Sichuan province under uniaxial compression is recorded by using the testing scheme. Quantitatively investigated the propagation and coalescent of cracks at meso-scale with digital technology, the basic geometric information of rock microcracks such as area, angle, length, width, perimeter, are obtained from binary images after segmentation. The failure mechanism of specimen under uniaxial compression with the quantitative information is studied from macro/micro scopic perspective. The result shows that during the damage of the specimen the distribution of microcracks in the whole specimen are still subjected to exponential distribution with some microcracks concentrated in certain regions. The conclusion indicates that the testing scheme is applicable.更多还原