What does a hand shear vane measure?

What does a hand shear vane measure?

The shear vane test is a method of measuring the undrained shear strength of a cohesive soil. A gauge on the top of the rod measures the torque required to cause failure of the soil and provides a conversion to shear strength. The equipment has been in use since at least 1948.

What type of results you will conclude from 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).

At what rate vanes shall be rotated?

The top of the vanes should be atleast 10 mm below the top of the specimen. Note the readings of the angle of twist. 4. Rotate the vanes at an uniform rate say 0.1o/s by suitable operating the torque application handle until the specimen fails.

How do you do a vane check?

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 a hand vane?

The Hand Vane Tester is an accurate and portable instrument used for the determination of in-situ shear strength of cohesive soils, either on-site or on undisturbed or remoulded samples in the laboratory. The instrument consists of a torque head with a direct-reading scale which is turned by hand.

What is the use 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.

What is remoulded shear strength?

The magnitude of the shear stress that a disturbed soil can sustain in an undrained condition.

What causes general shear failure?

General Shear Failure In general shear failure of soil, sudden collapse occurs, accompanied by tilting of the footing. This type of failure occurs in case of dense sand or stiff cohesive soil supporting the footing.