KAUST DepartmentPh.D. Candidate, Dept. of Earth Science and Engineering, King Abdullah Univ. of Science and Technology, Thuwal 23955, Saudi Arabia (corresponding author). ORCID: .
Energy Resources and Petroleum Engineering Program
Ali I. Al-Naimi Petroleum Engineering Research Center (ANPERC)
Physical Science and Engineering (PSE) Division
Permanent link to this recordhttp://hdl.handle.net/10754/666430
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AbstractHeat flow controls the design and operation of a wide range of engineered geosystems. This study uses transient thermal probe measurements to determine the evolution of the thermal conductivity of air-dry and water-saturated sand–silt mixtures as a function of effective stress. Results confirm that the thermal conductivity of soils varies with state of stress, dry mass density, mineralogy, and pore fluid properties and highlight the effect of thermal contact resistance on the thermal conductivity of granular materials. Thermal conductivity follows a linear relationship with the logarithm of effective stress as a consequence of fabric compaction, increased coordination number, contact deformation, and reduced thermal contact resistance. The bulk thermal conductivity of water-saturated soils is more than seven times that of air-dry soils for the same fines content (FC) and effective stress. Pore-filling fines contribute conduction paths and interparticle coordination; the peak in thermal conductivity takes place at FC≈0.4; this mixture range corresponds to the transition from fines-controlled to coarse-controlled mechanical response (i.e., both fines and coarse grains are load bearing), in agreement with the revised soil classification system.
CitationRoshankhah, S., Garcia, A. V., & Carlos Santamarina, J. (2021). Thermal Conductivity of Sand–Silt Mixtures. Journal of Geotechnical and Geoenvironmental Engineering, 147(2), 06020031. doi:10.1061/(asce)gt.1943-5606.0002425
SponsorsSupport for this research was provided by the Goizueta Foundation at the Georgia Institute of Technology and the KAUST endowment at King Abdullah University of Science and Technology. The authors’ gratitude extends to Gabrielle E. Abelskamp, who edited the manuscript.
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