冻结裂隙岩石加卸载破坏机理CT实时试验

Real-time CT test of damage failure mechanism of frozen cracked rock in loading and unloading condition

利用自制的岩石力学三轴CT加载系统 ,完成了具有单一裂纹的裂隙岩石在负温条件下的加卸载损伤破坏机理CT实时对比试验研究。分析了冻结裂隙岩石加卸载损伤全过程的CT图像和CT数的演化规律。结果表明 ,与连续加载情况下相比 ,冻结裂隙岩石的卸围压破坏突发性强 。

Using the specified triaxial loading equipment corresponding to the CT machine, the comparison of real-time computerized tomography testing of damage failure mechanism of cracked rock in cold region under successive triaxial loading and unloading has been accomplished .The evolution law of CT number and CT images in the complete process of damage failure of frozen cracked rock is studied. It shows that it is easy for failure phenomenon to happen suddenly in the process of unloading of frozen cracked rock compared to the successive triaxial loading .The size of volume expansion of frozen cracked rock in unloading condition is larger than that in successive loading condition.