Detection of soil variability using CPTs

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Abstract

The variability of soil is well known to affect the geotechnical performance of structures. As probabilistic design methods become more commonly used, the ability to measure the variability of soil becomes more important. However, by using only the point statistics of soil parameters in design (e.g. the mean and standard deviation), typically an over-estimation of failure probabilities occurs, leading to over-conservative designs. By looking at the spatial correlation (e.g. scales of fluctuation) a more accurate representation can be achieved. This paper presents a method to use vertical Cone Penetration Tests (CPTs) to detect both the vertical and horizontal scales of fluctuation. An extensive numerical and experimental investigation has been undertaken to understand how spatial variation can be estimated and to quantify the accuracy in that estimation. The impact of being able to quantify the uncertainty is illustrated via a simple slope stability example.
Original languageEnglish
Title of host publicationCone Penetration Testing 2018
Subtitle of host publicationProceedings of the 4th International Symposium on Cone Penetration Testing (CPT'18), 21-22 June, 2018, Delft, The Netherlands
EditorsMichael A. Hicks, Federico Pisano, Joek Peuchen
Place of PublicationLondon
PublisherCRC Press
Pages289-294
ISBN (Electronic)978-0-429-50598-0
ISBN (Print)978-1-138-58449-5
Publication statusPublished - 21 Jun 2018
Event4th International Symposium on Cone Penetration testing - Aula Conference Centre, Delft, Netherlands
Duration: 21 Jun 201822 Jun 2018
Conference number: 4
https://www.kivi.nl/afdelingen/geotechniek/nieuws/artikel/4th-international-symposium-on-cone-penetration-testing

Conference

Conference4th International Symposium on Cone Penetration testing
Abbreviated titleCPT18
CountryNetherlands
CityDelft
Period21/06/1822/06/18
OtherCPT’18 will focus on the solution of geotechnical challenges using the cone penetration test (CPT), CPT add-on measurements and companion in-situ penetration tools (such as full flow and free fall penetrometers), with particular emphasis on practical experience and application of research findings. As CPTs play a major role in geo-engineering, CPT’18 will bring together the world’s experts who are working to improve the quality and reduce the difficulties involved. The symposium will be attended by academics, researchers, consultants, practitioners, hardware/software suppliers, certifiers and students. It will be a unique opportunity for meeting people and sharing high-level knowledge.
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    de Gast, T., Vardon, P., & Hicks, M. (2018). Detection of soil variability using CPTs. In M. A. Hicks, F. Pisano, & J. Peuchen (Eds.), Cone Penetration Testing 2018: Proceedings of the 4th International Symposium on Cone Penetration Testing (CPT'18), 21-22 June, 2018, Delft, The Netherlands (pp. 289-294). CRC Press.