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 does a Torvane measure?

Description. 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.

For which type of soil vane shear test is used?

clay soils
The shear vane is a simple and portable piece of equipment. The test is suitable for clay soils classified as soft to firm. By remoulding the sample and retesting an indication of the sensitivity of the clay can also be found.

Is 2720 a vane shear test?

The Vane Shear Test is carried out in accordance with IS : 2720 (part XXX) – 1980. This test is useful for determining the undrained shear strength (S) of clay and can be performed both in the lab and in the field. A four-bladed vane on the end of a rod makes up the apparatus.

What is the purpose of vane shear test?

It is used to determine the undrained shear strength of soils, especially very soft and sensitive clays. This test can be done in a laboratory or in the field directly on the ground. Vane shear test gives accurate results for soils of low shear strength.

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 vane shear test is done?

Is code for vane shear test?

IS 4434: Code of practice for in-situ vane shear test for soils.

What is the objective of vane shear test?

Objective The laboratory vane shear test for the measurement of shear strength of cohesive soils, is useful for soils of low shear strength of less than about 0.5 kgf/cm2). This test gives the undrained strength of the soil, in undisturbed as well as remoulded conditions both.

How would you conduct an in-situ vane shear test?

The tip has a diameter of 7.5cm and a height of 11.2cm. Typically the ration of height to diameter should be 2. The Vane is introduced into the borehole to the depth where the measurement of the undrained shear strength is required. Then it is rotated and the torsional force required to cause shearing is calculated.

What is pocket test?

General The Pocket Penetrometer is designed as a lightweight instrument for use by field personnel to check visual classification of soils. It can be used to verify whether excavation side walls require shoring, based on OSHA cohesive soils classifications.