1.4. Indicator for Consistency of Clays

Try these first

1. 1.

   What does the unconfined compression test measure?

   Hint

   Think about what happens when you compress soil without lateral support.

2. 2.

   What is the confining pressure (σ3) during this test?

   Hint

   Recall the definition of 'unconfined'.

3. 3.

   What is the maximum axial stress in an unconfined compression test known as?

   • Saturation Strength
   • Confining Strength
   • Unconfined Compression Strength

   Hint

   Focus on 'unconfined'.

4. 4.

   True or False: The unconfined compression test can only be performed on saturated soils.

   • True
   • False

   Hint

   Think about the flexibility of testing conditions.

5. 5.

   A new construction site shows soil with an unconfined compressive strength of only 50 kPa at a moisture level of 90%. What recommendations would you give regarding using this soil?

   Hint

   Focus on the relationship between strength and moisture levels.

6. 6.

   If Mohr's Circle indicates that the major principal stress is 150 kPa while running an unconfined compression test, what can you conclude about the soil's safety under reinforcement?

   Hint

   Consider factors of safety in your response.