Field Test Evaluation of Effect on Cone Resistance Caused by Change in Penetration Rate

Rikke Poulsen, Benjaminn Nordahl Nielsen, Lars Bo Ibsen

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

Abstract

This paper presents how a change in cone penetration rate affects the measured cone resistance during cone penetration testing in silty soils. Regardless of soil, type the standard rate of penetration is 20 mm/s and it is generally accepted that undrained penetration occurs in clay while drained penetration occurs in sand. In intermediate soils such as silty soils, the standard cone penetration rate may result in drainage conditions varying from undrained to partially or fully drained conditions. Field cone penetrations tests have been conducted with different penetration rates on a test site in Dronninglund where the subsoil primary consists of sandy silt. A total of 15 cone penetration tests with penetration rates varying from 60 to 0.5 mm/s and two geotechnical borings were conducted at the test site. Large soil samples were also collected from the test site in order to determine soil properties in the laboratory. A change in the measured cone resistance occurs by lowering the penetration rate. This is caused by the changes in drainage conditions. Compared to the normal penetration rate of 20 mm/s, this paper illustrates that lowering the penetration rate leads to an increase in the cone resistance from 1.0 – 1.7 depending on the initial drainage condition. This can be important if a project requires knowledge of the drained soil parameters in silt.
Original languageEnglish
Title of host publicationNGM 2012 Proceedings : Proceedings of the 16th Nordic Geotechnical Meeting
Number of pages8
Volume1
PublisherDansk Geoteknisk Forening
Publication date2012
Pages191-198
ISBN (Print)978-87-89833-27-9
Publication statusPublished - 2012
EventThe Nordic Geotechnical Meeting - Copenhagen, Denmark
Duration: 9 May 201212 May 2012
Conference number: 16

Conference

ConferenceThe Nordic Geotechnical Meeting
Number16
CountryDenmark
CityCopenhagen
Period09/05/201212/05/2012

Bibliographical note

Proceedings published in 2 volumes

Keywords

  • Silts
  • Drainage
  • In Situ Testing
  • Site Investigation

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