Practice Question: Effective Stress at Bottom of a Soil Layer
NCEES Civil PE Specification Soil Mechanics: Effective and Total Stresses
Given the soil profile pictured below, determine the effective stress at the bottom of soil layer 2. Assume groundwater table at the surface.
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Answer: D) 1833 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.