Tampere University of Technology

TUTCRIS Research Portal

Variation of Measured CPTu Data

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Original languageEnglish
Title of host publicationProceedings of the 7th International Symposium on Geotechnical Safety and Risk (ISGSR)
EditorsJianye Ching, Dian-Qing Li, Jie Zhang
Place of PublicationSingapore
Number of pages6
ISBN (Electronic)978-981-11-2725-0
Publication statusPublished - 11 Dec 2019
Publication typeA4 Article in a conference publication
EventInternational Symposium on Geotechnical Safety and Risk -
Duration: 1 Jan 1900 → …


ConferenceInternational Symposium on Geotechnical Safety and Risk
Period1/01/00 → …


Tampere University (TAU) has implemented an extensive research program for soil testing in Finland. This research project aims firstly to collect data from high quality in-situ and laboratory tests to form a large database on soft Finnish clays. Secondly, the focus has been to derive CPTu correlations for the strength and deformation properties specific to Finnish clays. The collected database is used in this study to investigate the variability in CPTu borings made into soft Finnish clays, in order to evaluate the measurement uncertainty in CPTu tests. Four different clay sites, each containing three CPTu borings, were chosen from the database. The variability in measured cone tip resistance and pore pressure have been analyzed for each CPTu boring. The results show that the repeatability of the CPTu is very good and the obtained coefficient of variations (COV) for separate borings as well as each site are moderately low. This indicates low measurement uncertainty in measured CPTu data, when the tests are done with care.

Publication forum classification

Field of science, Statistics Finland