The Soft-Oedometer: A Simple Test to Calibrate Advanced Constitutive Models for CPT Simulations in Soft Rocks

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Axial pile design approaches based on CPT data have recently been developed for low-medium density chalk ground conditions, while numerical modelling of similar boundary value problems has proved useful in understanding better pile behavior and aiding the interpretation of field and physical tests. In this paper a simple method to calibrate an advanced constitutive model for soft rocks is presented. To this end a newly developed soft oedometer apparatus able to measure both axial and radial stresses is used to perform 1D compression tests of low-medium density chalk samples. The calibrated large strain constitutive model is then used to perform a numerical simulation of a CPT installation in chalk. The results are compared to field data, showcasing the models’ capabilities, and highlighting the potential of the soft oedometer for the calibration of constitutive models without the need of triaxial test data.
Original languageEnglish
Title of host publicationGeotechnical Engineering in the Digital and Technological Innovation Era
EditorsAlessio Ferrari, Marco Rosone, Maurizio Ziccarelli, Guido Gottardi
Place of PublicationSwitzerland
Number of pages8
ISBN (Electronic)9783031347610
ISBN (Print)9783031347603 (hbk), 9783031347634 (pbk)
Publication statusPublished - 2023
EventVIII Convegno Nazionale dei Ricercatori di Ingegneria Geotecnica: 8th Italian Conference of Researchers in Geotechnical Engineering - Università degli Studi di Palermo, Palermo, Italy
Duration: 5 Jul 20237 Jul 2023

Publication series

NameSpringer Series in Geomechanics and Geoengineering (SSGG)
ISSN (Print)1866-8755
ISSN (Electronic)1866-8763


ConferenceVIII Convegno Nazionale dei Ricercatori di Ingegneria Geotecnica
Abbreviated titleCNRIG 2023
Internet address


  • Soft rock
  • chalk
  • element testing
  • constitutive modelling
  • CPT


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