CT检测技术在土样初始损伤研究中的应用

Application of CT testing technology in evaluating the uniformity of soil samples

对用短时压实法制成的两种粉质粘土试样进行CT扫描,获得了两种试样中土颗粒和水的标称质量吸收系数.通过CT扫描结果,对试样的初始损伤进行评价.整体来看,试样的CT数方差不大,密度分布比较均匀,比分层击实法制成的试样的均匀性好,且粘粒含量高,用短时击实法较容易获得初始损伤较小的试样.对密度分布进行具体分析发现:轴向看,试样两端密度大,中间密度小;径向看,周边密度大,中心密度小;径向的总体均匀性比轴向的好.

Two kinds of silty clay samples made through little-pressing specimen-preparing metheod were tested by computerized tomography technology. The mass absorbing coefficient of soil grain and water were obtained and the uniformity damage to the samples was evaluated. The results show that the variance of CT value is little and the density distribution is well-proportioned. The little-pressing specimen-preparing method is better than traditional layered-bumping specimen-preparing method. Furthermore, the higher the clay grain content is., the less the initial damage to the samples is. A detailed analysis of the density distribution show that the density in the two extreme parts of the samples is greater than that in the middle part, and the density in central location is less than that in the surrounding part. Furthermore, the radial uniformity of sample is better than axial uniformity.