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4 cards from this section. Quick, good the night before a test.
What is the unconfined compressive strength called?
Identify the term we use to represent maximum axial stress in an unconfined test.
What is the confining pressure (σ3) during the unconfined compression test?
Think about what 'unconfined' means in terms of pressure.
What does unsaturated refer to in unsaturated soils?
Consider what 'unsaturated' means in terms of water content.
The unconfined compressive strength qu is equal to what during the test?
Remember the definition of qu in the context of this test.
A soil sample shows an unconfined compressive strength of 150 kPa and is tested under increasing levels of saturation. If the saturation increases to 80%, what would you predict occurs to the strength? Explain your reasoning.
Recall the relationship between water content and soil stability.
In a field study, a retaining wall is constructed on a saturated clay layer. Using the knowledge from the unconfined compression test, outline how you would evaluate its integrity following heavy rainfall.
Investigate how the test may reveal changes in soil properties post-rainfall.
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