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利用作者已研制成功的与 CT机配套的专用三轴加载试验设备 ,在国内外首次完成了岩石卸荷损伤断破裂坏全过程的实时 CT试验。得到了岩石卸荷损伤演化过程中从裂纹发育、扩展、贯通到断裂破坏全过程的 CT图像。通过与岩石连续加载破坏过程细观试验结果的比较发现 ,岩石卸荷破坏比连续加载情形下岩石破坏更具突发性。由静态连续加载岩石细观损伤机理出发 ,将静态岩石全过程曲线划分为 5个阶段。得到了卸荷条件下岩石损伤扩展的初步规律。
The authors completed the real-time CT test for the whole process of rock unloading damage breaking at home and abroad for the first time by using the special three-axis loading test equipment that the author has successfully developed and supporting the CT machine. The CT images of the whole course of the rock unloading damage evolution from crack development, expansion and penetration to fracture failure were obtained. Comparing with the results of meso-scale test of continuous loading and destructive process of rock, it is found that the unloading damage of rock is more sudden than that of rock under continuous loading. Based on the mechanism of meso-damage loading of rock under static loading, the whole curve of static rock is divided into five stages. The initial law of rock damage expansion under unloading condition is obtained.