1.4. Initial Stages of Compression

Try these first

1. 1.

   What is effective stress in soil mechanics?

   Hint

   Think about what portion of stress actually acts on the soil structure.

2. 2.

   Describe what happens to soil when it is unloaded from point C.

   Hint

   Consider how unloading affects the soil structure.

3. 3.

   What is the primary characteristic of the virgin compression curve?

   • It shows initial minor compression
   • It represents maximum compression under normal conditions
   • It shows no compression effects

   Hint

   Focus on the term 'virgin' and its meaning in this context.

4. 4.

   True or False: Permanent strain is reversible.

   • True
   • False

   Hint

   Think about what happens to the soil when it unloads.

5. 5.

   A soil sample undergoes a loading test where it initially maintains a void ratio of 0.5. After reaching peak stress, it unloads and takes on a new void ratio of 0.6. Calculate the permanent strain.

   Hint

   Remember, permanent strain shows the irreversible change; voids increase here.

6. 6.

   During a construction project, a site displayed signs of soil hysteresis. Describe the probable causes and how to mitigate issues.

   Hint

   Think about the role of past soil conditions and moisture.