EARTH458 Lecture Notes - Lecture 6: Effective Stress, Landslide, Hydrogeology
16 Jul 2020
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Week 4: flow nets, aquifer stress, and storage. Change is effective stress is a change in dp. If there is a change in total stress the pressure and e stredd also change. Dsigma t = d sigma e + d p. Extreme cases: effective stress goes to zero: essentially no forces holding grains together, soil mass acts as a liquid and has no strength to it, slope failures. In your own words, describe what happens as a load is added to sealed container containing a spring and water, and then what happens once the seal is removed. Initially the spring supports the overburden/ total stress, when water is added it is under pressure due to its own weight. When it is sealed the spring is not able to compress and causes an increase in water pressure. When unsealed the water escapes the cylinder, and the spring compresses, the pressure decreases, the effective stress increases.
