In this study,mercury intrusion porosimetry(MIP)and X-ray micro-computed tomography(XRµCT)were used to characterize the pore structures and investigate the permeability characteristics of clay after aging and con...In this study,mercury intrusion porosimetry(MIP)and X-ray micro-computed tomography(XRµCT)were used to characterize the pore structures and investigate the permeability characteristics of clay after aging and contamination with diesel.The results of the MIP tests showed that aging leads to reductions in porosity and average diameter,as well as an increase in tortuosity.The XRµCT analysis yielded consistent results;it showed that aging renders pores more spherical and isotropic and pore surfaces smoother.This weakens the pore connectivity.Micromorphological analysis revealed that aging led to the rearrangement of soil particles,tighter interparticle overlapping,and a reduction in pore space.The combination of MIP and XRµCT provided a comprehensive and reliable characterization of the soil pore structure.An increased diesel content increased the porosity and average diameter and reduced the tortuosity of the pores.Mechanistic analysis showed that aging weakens interparticle cohesion;this causes large agglomerates to break down into smaller agglomerates,resulting in a tighter arrangement and a subsequent reduction in porosity.An increase in diesel content increases the number of large agglomerates and pore spaces between agglomerates,resulting in increased porosity.Both aging and diesel content can weaken the permeation characteristics of soil.展开更多
Some physical properties of crystals differ in direction n because crystal lattices are often anisotropic. A polycrystal is an aggregate of numerous tiny crystallites. Unless the polycrystal is an isotropic aggregate ...Some physical properties of crystals differ in direction n because crystal lattices are often anisotropic. A polycrystal is an aggregate of numerous tiny crystallites. Unless the polycrystal is an isotropic aggregate of crystallites, the physical properties of the polycrystal vary with n. The direction-dependent functions （DDF） for crystals and polycrystals are introduced to describe the variations of the physical properties in direction n. Until now there are few papers dealing systematically with relations between the DDF and the crystalline orientation distribution. Herein we give general expressions of the DDF for crystals and polycrystals. We discuss the applications of the DDF in describing the physical properties of crystals and polycrystals.展开更多
基金the National Natural Science Foundation of China(Grant Nos.40772190 and 42067045)the Science Foundation for Distinguished Young Scholars of Guangxi(No.2017GXNSFBA198199)the Interdisciplinary Scientific Research Foundation of Guangxi University(No.2022JCC029)。
文摘In this study,mercury intrusion porosimetry(MIP)and X-ray micro-computed tomography(XRµCT)were used to characterize the pore structures and investigate the permeability characteristics of clay after aging and contamination with diesel.The results of the MIP tests showed that aging leads to reductions in porosity and average diameter,as well as an increase in tortuosity.The XRµCT analysis yielded consistent results;it showed that aging renders pores more spherical and isotropic and pore surfaces smoother.This weakens the pore connectivity.Micromorphological analysis revealed that aging led to the rearrangement of soil particles,tighter interparticle overlapping,and a reduction in pore space.The combination of MIP and XRµCT provided a comprehensive and reliable characterization of the soil pore structure.An increased diesel content increased the porosity and average diameter and reduced the tortuosity of the pores.Mechanistic analysis showed that aging weakens interparticle cohesion;this causes large agglomerates to break down into smaller agglomerates,resulting in a tighter arrangement and a subsequent reduction in porosity.An increase in diesel content increases the number of large agglomerates and pore spaces between agglomerates,resulting in increased porosity.Both aging and diesel content can weaken the permeation characteristics of soil.
基金supported by the National Natural Science Foundation of China (10562004, 10662004)the Jiangxi Project to Nurture Academic and Technical Leaders in Targeted Areas+1 种基金the Research Fund for the Docotoral Program of Higher Education (20070403003)the Natural Science Foundation of Jiangxi of China (2008GZW0005).
文摘Some physical properties of crystals differ in direction n because crystal lattices are often anisotropic. A polycrystal is an aggregate of numerous tiny crystallites. Unless the polycrystal is an isotropic aggregate of crystallites, the physical properties of the polycrystal vary with n. The direction-dependent functions （DDF） for crystals and polycrystals are introduced to describe the variations of the physical properties in direction n. Until now there are few papers dealing systematically with relations between the DDF and the crystalline orientation distribution. Herein we give general expressions of the DDF for crystals and polycrystals. We discuss the applications of the DDF in describing the physical properties of crystals and polycrystals.
