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3 cards from this section. Quick, good the night before a test.
What is effective stress in soil mechanics?
Think about what portion of stress actually acts on the soil structure.
Describe what happens to soil when it is unloaded from point C.
Consider how unloading affects the soil structure.
What is the primary characteristic of the virgin compression curve?
Focus on the term 'virgin' and its meaning in this context.
True or False: Permanent strain is reversible.
Think about what happens to the soil when it unloads.
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.
Remember, permanent strain shows the irreversible change; voids increase here.
During a construction project, a site displayed signs of soil hysteresis. Describe the probable causes and how to mitigate issues.
Think about the role of past soil conditions and moisture.
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