Interpreting and validating the thermal cone penetration test (T-CPT)

The thermal cone penetration test (T-CPT) allows in situ measurement of the thermal properties of soil during a CPT – that is without withdrawing the CPT tool and introducing another tool such as a thermal needle probe. An interpretation method is presented based on one-dimensional axisymmetric anal...

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Bibliographic Details
Published in:Géotechnique 2019-07, Vol.69 (7), p.580-592
Main Authors: Vardon, Philip J., Baltoukas, Dimitris, Peuchen, Joek
Format: Article
Language:English
Subjects:
Computer simulation
Cone penetration tests
Dimensional analysis
Exact solutions
In situ measurement
Laboratory tests
Mathematical models
Penetration tests
Penetrometers
Soil
Soil properties
Temperature requirements
Temperature sensors
Thermal conductivity
Thermal properties
Thermodynamic properties
Two dimensional models
Voids
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Summary:The thermal cone penetration test (T-CPT) allows in situ measurement of the thermal properties of soil during a CPT – that is without withdrawing the CPT tool and introducing another tool such as a thermal needle probe. An interpretation method is presented based on one-dimensional axisymmetric analytical solutions. Numerical verification of the method is given and numerical simulations are presented to derive a calibration factor required for the interpretation model. This factor accounts for the temperature sensor location and two-dimensional geometric effects, particularly internal voids and end effects for the cone penetrometer. Finally field data are presented for the T-CPT and compared with results from in situ needle probe tests and laboratory tests on sampled material. The interpretation model is able to provide thermal conductivity values robustly.
ISSN:0016-8505
1751-7656
DOI:10.1680/jgeot.17.P.214