1. Direct Shear Test

Try these first

1. 1.

   What is the purpose of the Direct Shear Test?

   Hint

   Think about the forces acting on the soil.

2. 2.

   What does the shear box do?

   Hint

   Consider its function in testing.

3. 3.

   What type of soil is primarily tested using the Direct Shear Test?

   • Clay
   • Silt
   • Dry sand

   Hint

   Think about the characteristics of different soil types.

4. 4.

   True or False: The friction angle (ϕ) can be determined directly from the results of the Direct Shear Test.

   • True
   • False

   Hint

   Connect it to the plot from the test procedure.

5. 5.

   A direct shear test is carried out at various normal loads: 50 kPa, 100 kPa, and 150 kPa, yielding shear stresses of 25 kPa, 45 kPa, and 75 kPa respectively. Determine the friction angle (ϕ).

   Hint

   Find the slope from the shear stress and normal stress relationship.

6. 6.

   Discuss the effects of moisture content in a Direct Shear Test on sandy soils. How might this affect results?

   Hint

   Consider how water interacts with soil grains.