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利用CT技术可以在不破坏土体结构的情况下,连续不间断的观测到土体试样内各局部区域参数的变化.研究了两种粉质黏土试样分别以不同冻结方式进行冻结,并对试样进行了无损CT扫描,比较了冻结前后的CT数变化,由此定量得到试样内部各区域含水量和干密度的变化程度.结果表明:对于初始均匀的试样而言,不同冻结方式,对试样冻结后其内部含水量和干密度的变化的影响程度及趋势是不同的,比较而言,轴向冻结方式对冻土试样内部含水量的变化影响要小于径向冻结方式.
By using the CT technology, the local area parameters in the soil samples can be continuously and uninterruptedly observed without destroying the structure of the soil.The two samples of silty clay were frozen by different freezing methods The nondestructive CT scanning of the sample was carried out and the changes of CT number before and after freezing were compared to obtain quantitatively the degree of change of water content and dry density in each region of the sample.The results showed that for the initial uniform sample, Way, the impact of the internal moisture content and dry density of the sample after freezing changes the extent and trends are different, in contrast, the axial freezing method changes in the frozen soil moisture content less than the radial freezing method .