Thermal Resistivity of Soils

Salomone, Lawrence A.; Kovacs, William D.

doi:10.1061/(asce)0733-9410(1984)110:3(375)

Cited by 60 publications

(11 citation statements)

References 14 publications

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“…Factors affecting soil thermal conductivity include moisture content, dry density, mineral composition and temperature [1][2][3][4][5]. Moisture content, by far, has the greatest impact upon soil thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…This "bridging" increases the effective contact area between the soil particles, which increases the heat flow and results in higher thermal conductivity. As the voids between the soil particles become completely filled with moisture, the soil thermal conductivity no longer increases with increasing moisture content [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…With an increase in soil dry density, more soil particles are packed into a unit volume and the number of contact points between the particles increases. This increase in contact points provides a larger heat flow path and, thus, increases the soil thermal conductivity [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Development of correlations for soil thermal conductivity

Becker

Misra

Fricke

1992

International Communications in Heat and Mass Transfer

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-Soil thermal conductivity is significantly influenced by saturation and dry density. In this paper, a family of empirical correlations are presented which relate soil thermal conductivity to saturation for five soil types, namely, gravel, sand, silt, clay and peat, in both the frozen and unfrozen states. These correlations were developed from a soil thermal conductivity database which was constructed from measured data available in the literature. The effects of dry density are also examined.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of correlations for soil thermal conductivity

Becker

Misra

Fricke

1992

International Communications in Heat and Mass Transfer

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“…An experienced researcher can recognise the subsurface conditions, where the embedded structures have been implanted. Surface contamination tends to concentrate on existing ditches with surface runoff, then, by lowering the resistivity below the natural level [34]. Besides that, contamination evaluation will be affected when a new route is evaluated, and soil samples can be retrieved at crossings of the existing pipeline and cables by using soil augers.…”

Section: Wenner Soilmentioning

confidence: 99%

Measurement of Peat Soil Shear Strength Using Wenner Four-Point Probes and Vane Shear Strength Methods

Afip

Taib

Jusoff

et al. 2019

International Journal of Geophysics

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The general objective of this research was to measure the peat soil shear strength using Wenner four-point probes and vane shear strength methods. Specifically, the objective of this study was two-fold, namely, (a) investigating the relationship between laboratory soil resistivity and undrained shear strength and (b) determineing the relationship between in-situ soil resistivity and undrained shear strength. Data were randomly collected over six locations in Meranek, Sarawak, for in-situ test and three repetitions for each data were set based on three parameters. The selected parameters were soil density, moisture content, and salinity for both laboratory and in-situ test using Wenner four-point probes and vane shear method. The soil resistivity and vane shear strength readings for laboratory test were correlated with soil salinity, moisture content, and density. The R2 values showed a good correlation for soil salinity (R2 =0.8468) and density (R2 =0.9475), respectively. However, a weak correlation of R2 =0.1205 was observed for soil moisture. The R2 value for in-situ correlation between soil resistivity and three parameters (soil salinity, moisture content, and density) was R2 =0.8916. It can be concluded that the peat soil shear strengths of the study area using Wenner four-point probes from in-situ were (4.38 ohm.m) and laboratory was (2.47 ohm.m) and when using the vane shear strength method, in-situ was (23 kPA) and laboratory was (5 kPA). This study implies that the peat soil of the study area can be categorized as texture (soft loamy soil) and it is suitable for agriculture instead of construction. The relationship established between Wenner four-point probes and vane shear method can be beneficial for ground engineering design to enhance investigation on site suitability. Future work on DUALEM-421 technique should be emphasised for better subsurface exploration accuracy and resolve peat depth for an in-situ test.

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“…In general, wetter and more dense soil has lower and more stable ρ T while looser and drier soil has higher ρ T . Critical moisture content, θ crit , defined as the θ below which ρ T increases rapidly with small reduction in θ, is located at the "knee" of a TRDC, as highlighted in Figure 1 (Radhakrishna et al 1980, Salomone & Kovacs 1984. Measurement of ρ T is a standard test method for the Institute of Electrical and Electronics Engineers (IEEE 442-1981).…”

Section: Introductionmentioning

confidence: 99%

Impact of Moisture Migration on Thermal Resistivity Testing in Unsaturated Soil

Woodward¹,

Tinjum²

2012

GeoCongress 2012

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This study investigates the impact of moisture redistribution during the measurement of the thermal dry-out curve (i.e., soil thermal resistivity, ρ T , versus moisture content, θ). Thermal dry-out curves are used in energy geotechnics (e.g., geothermal heating and cooling, collector systems at wind energy sites) to quantify the capacity of a soil to store or dissipate heat. Although there is not a standard method for measurement of the ρ T -θ relationship, curves are typically generated by measuring ρ T of remolded or undisturbed specimens at varying water contents, typically with incremental measurements as the specimen is dried. However, drying within a specimen may not be uniform, even in a controlled, low-temperature, drying environment. In this study, a thermal properties probe was used to measure ρ T of remolded cylindrical specimens as the soil was dried in a low-temperature oven. Three horizontal sensor locations (top, middle, and bottom) were used to measure ρ T across the specimen. Water content at the sensor locations was measured and compared to the corresponding ρ T measurement. Thermal resistivity tests were performed at various drying times for three soils: Poorly Graded Sand (SP), Silty Sand (SM), and Sand with Silt (SP-SM). Tests on SM remolded at 95% maximum dry density revealed θ up to nine times higher in the bottom sensor location than in the top sensor location. The test results indicate a need for modification of the standard thermal resistivity testing procedure such that moisture migration within a specimen during drying does not impact the testing accuracy.

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Thermal Resistivity of Soils

Cited by 60 publications

References 14 publications

Development of correlations for soil thermal conductivity

Development of correlations for soil thermal conductivity

Measurement of Peat Soil Shear Strength Using Wenner Four-Point Probes and Vane Shear Strength Methods

Impact of Moisture Migration on Thermal Resistivity Testing in Unsaturated Soil

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