1.2. Direct shear test in sand

Try these first

1. 1.

   What is the primary purpose of the direct shear test?

   Hint

   Think about what properties are measured during the test.

2. 2.

   What are the two types of stress measured in the direct shear test?

   Hint

   Consider the directions of forces applied to the soil.

3. 3.

   What does the direct shear test measure?

   • Friction angle
   • Compressibility
   • Permeability

   Hint

   Recall the main purpose of the test.

4. 4.

   True or False: The shear box used in the direct shear test is a solid, non-movable container.

   • True
   • False

   Hint

   Think about how the test is conducted.

5. 5.

   Calculate the shear stress if the normal stress is 120 kPa and the friction angle is 30 degrees. Use the equation: Shear stress = Normal stress * tan(friction angle).

   Hint

   Know how to use the tangent function for angles.

6. 6.

   Given a scenario where a sand sample with a stated friction angle of 28 degrees is to be used for a foundation. Discuss implications of the results for the design specifications of a multi-story building.

   Hint

   Think about engineering safety standards and how they relate to soil behavior.