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Problems related to field vane testing in soft soil conditions and improved reliability of measurements using an innovative field vane device

Research output: Chapter in Book/Report/Conference proceedingChapterScientificpeer-review

Details

Original languageEnglish
Title of host publicationLandslides in Sensitive Clays
Subtitle of host publicationFrom Research to Implementation
PublisherSpringer
Pages121-131
Number of pages11
ISBN (Electronic)978-3-319-56487-6
ISBN (Print)978-3-319-56486-9
DOIs
Publication statusPublished - 2017
Publication typeA3 Part of a book or another research book

Publication series

NameAdvances in Natural and Technological Hazards Research
Volume46
ISSN (Print)1878-9897
ISSN (Electronic)2213-6959

Abstract

In Finland, undrained shear strength is commonly measured using the field vane shear test (FV). Currently, the most commonly used field vane testers are the Nilcon vane and the electrical vane with shear rotation and measuring systems located above the ground level. Vane testing is normally carried out using vanes equipped with slip coupling, while the use of casing for protecting the vane is not very common. Recent studies from Finland have shown that the undrained shear strength of clays can be significantly underestimated when casing is not used. Experimental observations suggest that the slip coupling might not always be sufficient to remove all of the rod friction effects that occur during testing. Tampere University of Technology has recently purchased an innovative field vane apparatus with a vane tester unit, where torque and rotations are measured right above the vane. In this way, the effect of rod friction is minimized and the measured stressrotation behavior is less biased. In this study, issues related to practical applications, testing devices and interpretationmethods are discussed. Then, a critical comparison between test results in soft clays from both the traditional and new field vane testers is performed.

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