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An approach to characterisation of multi-scale pore geometry and correlation with moisture storage and transport coefficients in cement-stabilised soils

Micromechanical assessment of an internal stability criterion

Stress-induced evolution of anisotropic thermal conductivity of dry granular materials

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Stress-induced evolution of anisotropic thermal conductivity of dry granular materials

Content Provider	Springer Nature Link
Author	Choo, Jinhyun Kim, Young Jin Lee, Jung Hwoon Yun, Tae Sup Lee, Jangguen Kim, Young Seok
Copyright Year	2012
Abstract	Various factors, such as the volumetric fraction of constituents, mineralogy, and pore fluids, affect heat flow in granular materials. Although the stress applied on granular materials controls the formation of major pathways for heat flow, few studies have focused on a detailed investigation of its significance with regard to the thermal conductivity and anisotropy of the materials. This paper presents a numerical investigation of the stress-induced evolution of anisotropic thermal conductivity of dry granular materials with supplementary experimental results. Granular materials under a variety of stress conditions in element testing are analyzed by the three-dimensional discrete element method, and quantitative variations in their anisotropic effective thermal conductivity are calculated via the network model and conductivity tensor measurements. Results show that the directional development of contact area and fabric under anisotropic stress conditions leads to the evolution of anisotropy in thermal conductivity. The anisotropy induced in thermal conductivity by shear stress is higher than that induced by compressive stress because shear stress causes more significant changes in microstructural configurations and boundary conditions. The shear-stress-induced evolution of anisotropy between principal thermal conductivities depends on dilatancy as well as shearing mode, and the shear-driven discontinuity localizes the conductivity. Factors involved in the stress-induced evolution and their implications on the thermal conductivity characterization are discussed.
Starting Page	91
Ending Page	106
Page Count	16
File Format	PDF
ISSN	18611125
Journal	Acta Geotechnica
Volume Number	8
Issue Number	1
e-ISSN	18611133
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-06-08
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Anisotropy DEM Network model Stress dependence Thermal conductivity Geoengineering, Foundations, Hydraulics Continuum Mechanics and Mechanics of Materials Geotechnical Engineering & Applied Earth Sciences Soil Science & Conservation Soft and Granular Matter, Complex Fluids and Microfluidics Structural Mechanics
Content Type	Text
Resource Type	Article
Subject	Geotechnical Engineering and Engineering Geology

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