# Introduction of Vane Shear Test

A vane shear test is a type of soil test used to determine the soil’s shear strength. This test is performed by placing a small, cylindrical sample of soil in a shear box and applying a force to the top and bottom of the sample. The force is applied at a constant rate until the sample breaks or fails. The results of the test are used to determine the soil’s shear strength, which is a measure of the soil’s ability to resist shearing forces.

## Objectives of Vane Shear Test

• The objective of a Vane Shear Test is to determine the in-situ shear strength of a cohesionless soil mass
• This test is generally used for cohesionless soils, such as sand or gravel.

## The procedure of Vane Shear Test

• The Vane Shear Test (VST) is used to determine the in-situ shear strength of soils
• The test is performed by driving a thin-walled cylinder into the ground and measuring the torque required to rotate the cylinder
• The VST is typically performed in cohesionless soils, such as sand and gravel

• The test is not well suited for cohesive soils, such as clay, because the soil tends to flow into the cylinder as it is driven into the ground
• The VST is a quick and easy test to perform, and does not require expensive equipment

• The main disadvantage of the test is that it is a point-source test, meaning that it only provides information about the shear strength of the soil at the point where the test is performed
• To perform the VST, a thin-walled cylinder, called a vane, is driven into the ground using a hand-held torque wrench

• The torque required to rotate the vane is recorded at regular intervals as the vane is driven into the ground
• The vane is typically driven until it is half buried, at which point the torque required to rotate the vane will peak

• The peak torque is recorded and used to calculate the in-situ shear strength of the soil.

## Observations & Calculations

• In an experiment to test the effect of different types of music on plant growth, 3 identical potted plants were each exposed to a different type of music for 24 hours a day for 3 weeks
• The types of music were: classical, rock, and silence
• The plants were watered and otherwise cared for according to the instructions on the plant pots
• At the end of the 3 weeks, the plants were observed and measured
• The plant that had been exposed to classical music was the tallest, the plant that had been exposed to rock music was the shortest, and the plant that had been exposed to silence was in the middle.

These observations can be explained by the fact that plants grow best in silence, and that rock music has a negativ

## Advantages of Vane Shear Test

• Some advantages of the vane shear test are that it is a relatively simple test to perform and can be done in the field with minimal equipment
• Additionally, this test can be used to estimate the in-situ shear strength of a soil, which can be helpful in determining the stability of slopes or foundation design.

## Conclusion

The vane shear test is a simple, low-cost test that can be used to determine the shear strength of soils. This test is often used in construction projects to determine the shear strength of soil layers. The vane shear test is a good tool for determining the shear strength of soils, but it is important to understand the limitations of the test.