1.4. Shear Failure under Foundation Load

Try these first

1. 1.

   What is shear strength in soils?

   Hint

   Think about how soil behaves when pressure is applied.

2. 2.

   What is cohesion?

   Hint

   Consider how glue works to hold papers together.

3. 3.

   What is the main purpose of shear strength in soils?

   • To bind soil particles together
   • To resist sliding under stress
   • To compress the soil

   Hint

   Think about how soil holds up under heavy structures.

4. 4.

   True or False: Shear failure occurs only in saturated soil.

   • True
   • False

   Hint

   Consider different soil types and water interactions.

5. 5.

   A civil engineer needs to build a wall on sandy soil with a cohesion of 4 kPa and an internal friction angle of 25 degrees. What precautions should be considered regarding shear strength?

   Hint

   Consider how the soil might shift under pressure.

6. 6.

   Design a foundation for a structure weighing 200 kN on clay that has a cohesion of 10 kPa. Assuming an angle of internal friction of 20 degrees, calculate the required area of the foundation base to prevent shear failure.

   Hint

   Think about how applied load translates to stress over an area.