Cyclic CPT Measurements of Disturbed Soil State

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review


Disturbed soil states in geotechnical problems occurs together with large uncertainties. During earthquake, disturbed sand can become either more or less resistant to liquefaction. Due to the cyclic loading, offshore wind turbine foundations can episodically loose or recover the stiffness. In both cases, the initial in-situ soil state is lost, as disturbed soil state evolves during cyclic loading. Thus, it is important to develop a testing procedure that combines observations of both the initial condition and the long-term disturbed soil state.
This paper presents the results of cone penetration tests (CPT-s). A conventional use of CPT leads to undisturbed soil results. However, the paper describe a non-conventional use of this method, where CPT is performed multiple times in the same location. The first penetration measures the undisturbed sand strength and stiffness, whereas the second and later penetrations observe evolving disturbed state of sand. The ‘cyclic CPT’ curve of cone resistance qc converges while repeating the test, resulting in a final disturbed soil profile for initial sand state.
Original languageEnglish
Title of host publication7th International Symposium on Geotechnical Safety and Risk (ISGSR 2019) : State-of-the-Practice in Geotechnical Safety and Risk
PublisherResearch Publishing
Publication date2019
ISBN (Electronic)978-981-11-2725-0
Publication statusPublished - 2019
Event7th International Symposium on Geotechnical Safety and Risk - National Taiwan University of Science and Technology, Taipei, Taiwan, Province of China
Duration: 11 Dec 201913 Dec 2019
Conference number: 7


Conference7th International Symposium on Geotechnical Safety and Risk
LocationNational Taiwan University of Science and Technology
CountryTaiwan, Province of China
Internet address


  • Sand
  • Disturbed Soil
  • CPT
  • Cyclic Behaviour

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