Pore-scale investigations of partially water-saturated granular soil
Pore-scale investigations of partially water-saturated granular soil
复制标题
DOI：
10.1016/j.mechrescom.2018.08.016
复制
发表时间：
2018-12
影响因子：
2.4
通讯作者：
Y. Higo;Ryunosuke Kido;Fukushi Takamura;Y. Fukushima
中科院分区：
文献类型：
--
作者：
Y. Higo;Ryunosuke Kido;Fukushi Takamura;Y. Fukushima
部分水饱和颗粒土是土壤颗粒、孔隙水和孔隙空气的混合物。本研究提出了在孔隙尺度上获得部分水饱和均匀砂的孔隙度、饱和度和孔隙体积等局部量的方法。采用x射线微计算机断层扫描技术对不同持水状态下的砂样进行了扫描。将得到的三维层析图像进行三分化，即分割成土壤颗粒相、水相和空气相。将三角化后的体积划分为含有单个孔隙的Voronoi细胞，计算孔隙的体积和饱和度。另外，孔隙度和饱和度是量化的立方体局部子集排列在有序的三分体。利用这两项研究的结果，讨论了孔隙特征和局部持水行为。
Partially water-saturated granular soils are mixtures of soil grains, pore water, and pore air. This study presents methodologies to obtain local quantities, such as porosity, degree of saturation, and pore volume, for partially water-saturated uniform sand at the pore scale. A sand specimen subjected to different water retention states was scanned using X-ray micro computed tomography. The obtained three-dimensional tomographic images were trinarized, i.e. segmented into soil grain, water, and air phases. The trinarized volumes were divided into Voronoi cells containing individual pores, and the volume and degree of saturation for the pores were calculated. Alternatively, the porosity and degree of saturation were quantified for cubical local subsets arranged regularly in the trinarized volumes. Pore characteristics and local water retention behavior are discussed using the results of these two investigations.