How do you perform a vane shear test?

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 the purpose 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.

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 vane shear strength?

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.

How plate load test is conducted?

The plate load test, which is used to determine bearing capacity and settlement, may be carried out by either using a gravity loading or truss loading method. A test pit of the same depth as the foundation and width equal to five times the size of bearing plate is dug in the ground.

Why plate load test is done?

The Plate Bearing Test (or Plate Loading Test) is an insitu load bearing test of soil used for determining the ultimate bearing capacity of the ground and the likely settlement under a given load. The Plate Bearing Test is normally carried out at foundation level, either on the surface or in a shallow pit.

How is shear strength calculated using vane shear test?

Shear strength of given soil sample is calculated from below observations.

1. Diameter of vane, D = ___ cm.
2. Height of vane, H = ____ cm.
3. Torque, T = (Spring constant /180)*(initial reading-final reading)

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 a plate test?

The Plate Bearing Test (or Plate Loading Test) is an insitu load bearing test of soil used for determining the ultimate bearing capacity of the ground and the likely settlement under a given load. The test load is gradually increased till the plate starts to settle at a rapid rate.

When do you use a vane shear test?

What is Vane Shear Test? 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/cml . This test gives the undrained strength of the soil and the undisturbed and rernoulded strengths obtained are used for evaluating the sensitivity of the soil.

How big should the hole be for a shear vane?

If the specimen container is closed at one end it should be provided at the bottom with a hole of about I mm diameter. Lower the shear vanes into the specimen to their full length gradually with minimum disturbance of the soil specimen so that the top of the vane is at least 10 mm below the top of the specimen.

How are the blades of a vane sharpened?

Vane – The vane shall consist of four blades each fixed at 90° . The vane should not deform under the maximum torque for which it is designed. The penetrating edge of the vane blades shall be sharpened having an included angle of 90°.