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

Philip J. Vardon, Dimitris Baltoukas, Joek Peuchen

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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.

Original languageEnglish
Pages (from-to)580-592
Number of pages13
Issue number7
Publication statusPublished - 1 Jul 2019


  • in situ testing
  • Penetrometers
  • Temperature effects

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  • Datasets

    Example calculation sheet for Thermal Cone Penetration Test (T-CPT)

    Vardon, P. J. (Creator), Baltoukas, D. (Creator) & Peuchen, J. (Creator), TU Delft - 4TU Centre for research data, 2018


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