与医用CT配合使用的冻土三轴仪的研制与应用

Development and application of triaxial apparatus of frozen soil used in conjunction with medical CT

针对适用于低温环境下的配合医用CT实时扫描的冻土三轴仪的不足,研制了新的冻土三轴仪,介绍了其组成及其研发过程中需要克服的技术难点。利用该装置可以完成低温环境下试样的三轴加卸载试验,配合医用CT机时可实现整个力学过程的实时动态扫描。进行了冻结兰州黄土三轴加载实时CT扫描试验,试验结果表明,新研制仪器的各项参数均能满足冻土试样在三轴压缩和卸载过程中的实时CT扫描条件,也能够得到的不同载荷条件下的高质量细观结构CT图像,文中对试验结果进行了分析和讨论。该装置的成功研制为建立细观结构和宏观力学性质之间的联系提供一种新的技术手段。

For solving the deficiency of triaxial apparatus of frozen soil in matching the real-time scanning of medical CT in the low temperature environment, a new triaxial apparatus of frozen soils is developed successfully. The configuration of the apparatus and the technical difficulties that need to be overcome in the development process are also introduced. The apparatus can be used to complete the triaxial loading and unloading test in the low temperature environment. Meanwhile, the medical CT matched with the newly developed apparatus can realize the real-time dynamic scanning in the whole mechanical process. On this basis, the real-time CT scanning test of frozen loess under triaxial loading is conducted. The test results show that the parameters of the newly developed apparatus can meet the real-time CT scanning conditions of the frozen soil samples under triaxial loading and unloading. In addition, the high quality mesoscopic CT images of different load conditions are obtained; and then the test results are also analyzed and discussed. The development of the apparatus has provided a new technical means for establishing the relationship between the mesostructure and the macroscopic mechanical properties.