What is Torvane shear test?
The TORVANE is a hand-held vane shear device for rapid determination of shear strength in cohesive soils either in the laboratory or the field. The TORVANE allows shear strength to be measured in the sides of test pits, trenches or excavations.
How do you perform a vane shear test?
The test starts by pushing the vane and the rod vertically into the soft soil. The vane is then rotated at a slow rate of 6° to 12° per minute. The torque is measured at regular time intervals and the test continues until a maximum torque is reached and the vane rotates rapidly for several revolutions.
What is ASTM d422?
ASTM Standards D421 Practice for Dry Preparation of Soil Samples for Particle-Size Analysis and Determination of Soil Constants.
At what rate vanes shall be rotated?
First, rate of rotation is fixed at 0.1 deg/s (6 deg/min) in accordance with Japanese Geotechnical Society Standards JGS1411: Method for field vane shear test, and ASTM D2573: Standard Test Method for Field Vane Shear Test in Cohesive Soil.
What is the purpose of vane shear test?
Vane shear test is used to determine the undrained shear strength of soils especially soft clays. This test can be done in laboratory or in the field directly on the ground. Vane shear test gives accurate results for soils of low shear strength (less than 0.3 kg/cm2).
Why vane shear test is performed?
To find shear strength of a given soil specimen. The laboratory vane shear test for the measurement of shear strength of cohesive soils, is useful for soils of low shear strength (less than 0.3 kg/cm2) for which triaxial or unconfined tests can not be performed. The test gives the undrained strength of the soil.
Why was ASTM d3080 withdrawn?
Withdrawn Rationale: The specimen is deformed at a controlled rate on or near a single shear plane determined by the configuration of the apparatus. Formerly under the jurisdiction of Committee D18 on Soil and Rock, this test method was withdrawn in April 2020 in accordance with section 10.6.
What is triaxial test of soil?
A triaxial shear test is a common method to measure the mechanical properties of many deformable solids, especially soil (e.g., sand, clay) and rock, and other granular materials or powders. The geometry of the shearing in a triaxial test typically causes the sample to become shorter while bulging out along the sides.