Practice Question: Effective Stress on a Soil Profile
NCEES Civil PE Specification III.C.: Effective and Total Stresses
Given the following soil profile, determine the effective stress at bottom of Soil Layer 2:
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Answer: B) 2954 psf
Effective stress is calculated based on the portion of stress that may be resisted by soil contact. To calculate effective stress, first calculate total stress at the bottom of layer 2, then subtract pore water pressure. Note that the layer of water above soil layers is ignored in this calculation.