岩石の圧縮破壊過程とそのメカニズムに関する研究

a .对岩石在压缩条件下的断裂过程和机理进行了一系列理论和实验研究。首先，采用位移不连续法分析了岩石在压缩作用下的破坏后行为，阐明了岩石的裂纹扩展过程。研究结果表明，裂缝剪切位移临界值是控制岩石断裂过程的主导因素。在CSD临界值较小的情况下，裂纹以I和II的复模态扩展，此时出现II类行为。另一方面，在临界值较大的情况下，II型裂纹扩展，然后出现I类行为。其次，利用可视化和图像处理技术对裂纹扩展过程进行了观察。研究表明，在ⅰ型和ⅱ型复合模态裂纹在岩石试件中扩展时，存在ⅱ类行为。这一结果与数值模拟结果相吻合。研究结果表明，裂纹的模态是控制岩石压缩破坏后行为的重要因素，岩石的II类行为以具有I型和II型的复杂模态裂纹为特征。

A.series of theoretical and experimental studies on the fracture process and mechanism of rock in compression has been carried out.Firstly, the post failure behavior of rock in compression has been analyzed by the Displacement Discontinuity Method and the process of crack propagation has been clarified. From this result, it is made clear that the critical value of Crack shear Displacement (CSD) is a dominant factor in contoroling the fracture process of rock. The crack propagate with the complex modes of I and II in the case that the critical value of CSD is relatively small and then class II behavior is cbserved. On the other hand, the mode II cracks growth in the case that the critical value is relatively large and then class I behavior is observed.Secondary, the crack propagation process has been observed by the visualization and image processing techniques. It is made clear that class II behavior is observed in the case that the complex mode crack with mode I and mode II propagates in rock specimen. This result agree with that estimated by the numerical simulation.It is conclude that mode of crack is an important factor in contoroling the post failure behavior of rock in compression and that the class II behavior of rock is characterized by the complex mode crack with mode I and II.