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Effective Stress, is in units of pressure (Pa, , , etc) and is given by this equation:

Total stress, , is the total amount of stress due to the soil at the depth you are considering:

is the soil density (e.g. 80 lb/ft^3).

is the acceleration of gravity (e.g. 32.2 ft/s^2).

is the distance of the surface, or beginning of the soil section, to the point you are considering(e.g. 10 ft).

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