Characterization of macropore structure of remolded loess and analysis of hydraulic conductivity anisotropy using X-ray computed tomography technology

被引：0
作者：
Haike Wang
Hui Qian
Yanyan Gao
机构：
[1] Chang’an University,School of Environmental Science and Engineering
[2] Chang’an University,Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education
来源：
Environmental Earth Sciences | 2021年 / 80卷
关键词：
Hydraulic conductivity; Anisotropy; Image segmentation; Remolded loess; Kozeny–Carman equation; X-ray CT;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The pore structure of loess is crucial for understanding the transport of water in soil and affects soil permeability. In this study, X-ray computed tomography (X-ray CT) technology was used to establish the macropore structure of remolded loess, and analyze the influence of macropore on permeability. A new specific and efficient workflow for constructing macropore structure of loess samples was established. The workflow improves the precision of image segmentation and provides a new method for creating 3D soil macropore structure. The macropore structure showed that the macro-porosity variation of loess sample was clearly anisotropic. Based on the macropore structure model, a modified Kozeny–Carman equation was suggested to investigate the hydraulic conductivity anisotropy of the loess sample. Subsequently, permeability test was used to verify the results calculated by equation. Both the results showed that hydraulic conductivity was positively correlated with the uniformity of the porosity changes in each direction. It provides a new method to estimate the anisotropy of hydraulic conductivity based on macropore structure model.
引用
收藏
相关论文
共 187 条
  • [11] Huang R(2019)Temporal variation in the permeability anisotropy behavior of the Malan loess in northern Shaanxi Province, China: an experimental study Environ Earth Sci 181 249-45
  • [12] Gao Q-F(2014)Structural characterization of natural loess and remolded loess under triaxial tests Eng Geol 29 273-1274
  • [13] Elliot TR(1985)A new method for gray-level picture thresholding using the entropy of the histogram Comput Vis Gr Image Process 27 381-368
  • [14] Reynolds WD(2001)Acquisition, optimization and interpretation of X-ray computed tomographic imagery: applications to the geosciences Comput Geosci 175 34-10
  • [15] Heck RJ(2012)Gas diffusivity in soils compared to ideal isotropic porous media J Plant Nutr Soil Sci 79 1267-198
  • [16] Ferreira TR(2015)Anisotropy of transport properties of a remolded Compact Andisol 178 359-31
  • [17] Pires LF(2013)X-ray CT and laboratory measurements on glacial till subsoil cores Soil Sci 236 4-279
  • [18] Wildenschild D(2018)A review of shear and tensile strengths of the Malan Loess in China Eng Geol 123 193-88
  • [19] Heck RJ(2014)Experimental investigation on compaction properties of solid backfill materials Min Technol 510 29-102
  • [20] Antonino ACD(2014)Accelerate research on land creation Nature 154 271-64
12345678910