What is ISO 22476‑9 about?
ISO 22476‑9 is the ninth part of the multi-series of international standard applicable to the geotechnical investigation and testing on field testing.
ISO 22476‑9 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 tests are described: the ordinary field vane test (FVT) and the fast field vane test (FVT-F).
Note: ISO 22476‑9 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: ISO 22476‑9 covers onshore and nearshore field vane testing.
Who is ISO 22476‑9 for?
ISO 22476‑9 on field testing is useful for:
- Geotechnical engineers and investigators
- Land/site-inspection agencies
- Soil probing and exploration rigs manufacturers and suppliers
- Government disaster management departments
- Regulatory bodies
- Civil engineers     
- Contractors 
Why should you use ISO 22476‑9?
Geotechnical testing is carried out by geotechnical engineers, geotechnical technicians, or engineering geologists to determine the physical attributes of a worksite.
By inserting a rectangular vane into fine-grained soil and rotating it, the test defined in ISO 22476-9 is used to determine the vane shear strength of soils in the undrained state. Before a geotechnical study, the vane shear strength determined by the test is usually rectified using local experience factors.
As a result of ISO 22476-9, identifying the right equipment and following necessary guidelines to conduct the field vane test is crucial for accuracy and efficiency. This will assist you in increasing the insertion length that can be obtained as well as reducing or measuring the system's friction.
With precise and efficient methods, equipment and reporting, you will be able to accurately assess the shear strength of the soil. These results are a crucial factor to determine the strength and sensitivity of soil, which could enable better decision making, especially with regards to disaster management activities.
