ISO 22476-9:2020
Geotechnical investigation and testing — Field testing — Part 9: Field vane test (FVT and FVT-F)
This document deals with the equipment requirements, execution and reporting of field vane tests for the measurement of peak and remoulded vane shear strength together with the sensitivity of fine-grained soils. In addition, post-peak shear strength behaviour can be evaluated. Two types of field vane test are described: the ordinary field vane test (FVT) and the fast field vane test (FVT-F).
The uncertainties of the vane test result are described in Annex D.
NOTE 1 This document fulfils the requirements for field vane tests as part of the geotechnical investigation and testing according to EN 1997-1 and EN 1997-2.
NOTE 2 This document covers onshore and nearshore field vane testing.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
4 Equipment and configurations
4.1 Test equipment
4.1.1 Vane and vane shaft
4.1.2 Friction reducer
4.1.3 Slip coupling
4.1.4 Extension rods, protective casings, protection shoe
4.1.5 Rotation unit
4.1.6 Equipment for measuring rotation and torque
4.2 Test configurations
5 Selection of equipment and test configuration
5.1 Selection of equipment
5.2 Selection of test configuration
6 Test procedure
6.1 Equipment checks and calibrations
6.2 Position and inclination of thrust machine
6.3 Test depths
6.4 Internal friction torque reading prior to testing
6.5 Methods for reaching the level for insertion of the vane
6.6 Insertion of the vane
6.7 External friction torque reading
6.8 Vane shear test
6.9 Internal friction torque reading after the test
7 Test results
8 Reporting
8.1 General
8.2 Reporting of test results
8.2.1 General information
8.2.2 Location of the test
8.2.3 Test equipment
8.2.4 Test procedure
8.2.5 Test results
8.3 Presentation of test plots
Annex A (informative) Test phases
Annex B (informative) Example of field report for field vane test
Annex C (normative) Maintenance, checks and calibration
Annex D (informative) Uncertainties in field vane testing
Annex E (normative) General interpretation and explanation for tapered and rectangular vanes with H/D ratios differing from 2
Annex F (informative) Interpretation and explanation for a rectangular vane with rounded corners
Annex G (informative) Calculation of test depth corrected for inclination
Annex H (informative) Example of estimation of post-peak behaviour
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
4 Equipment and configurations
4.1 Test equipment
4.1.1 Vane and vane shaft
4.1.2 Friction reducer
4.1.3 Slip coupling
4.1.4 Extension rods, protective casings, protection shoe
4.1.5 Rotation unit
4.1.6 Equipment for measuring rotation and torque
4.2 Test configurations
5 Selection of equipment and test configuration
5.1 Selection of equipment
5.2 Selection of test configuration
6 Test procedure
6.1 Equipment checks and calibrations
6.2 Position and inclination of thrust machine
6.3 Test depths
6.4 Internal friction torque reading prior to testing
6.5 Methods for reaching the level for insertion of the vane
6.6 Insertion of the vane
6.7 External friction torque reading
6.8 Vane shear test
6.9 Internal friction torque reading after the test
7 Test results
8 Reporting
8.1 General
8.2 Reporting of test results
8.2.1 General information
8.2.2 Location of the test
8.2.3 Test equipment
8.2.4 Test procedure
8.2.5 Test results
8.3 Presentation of test plots
Annex A (informative) Test phases
Annex B (informative) Example of field report for field vane test
Annex C (normative) Maintenance, checks and calibration
Annex D (informative) Uncertainties in field vane testing
Annex E (normative) General interpretation and explanation for tapered and rectangular vanes with H/D ratios differing from 2
Annex F (informative) Interpretation and explanation for a rectangular vane with rounded corners
Annex G (informative) Calculation of test depth corrected for inclination
Annex H (informative) Example of estimation of post-peak behaviour
Bibliography