岩石卸荷损伤演化机理CT 实时分析初探

 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。

PRIMARY STUDY OF REAL-TIME CTTE STING OF UNLOADING DAMAGE EVOLUTION LAW OF ROCK

It is the first time in rock mechanics field to make real-time CT testing of the meso-damage evolution law of the whole failure process of rock in unloading condition using the specified loading equipment corresponding to the CT machine developed by the authors.Through the CT testing,the clear CT images are obtained to include the whole process from the microcrack growth,propagation,penetration and failure of rock sample in unloading condiction.Comparing to the testing results of rock failure under the succesive loading and unloading condition,it is clear that it is easy for failure phenomenon to happen suddenly in the process of unloading condition of rock.For the static rock failure,the whole process curve is divided into five stages based on the meso-damage evolution law of rock in the successive loading condition.The initial unloading meso-damage evolution law is given.