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Lateral Earth Pressure

Lateral Earth Pressure is the horizontal pressure applied by or to soil when it is against standing structures like basements (buildings) and retaining walls. The lateral earth pressure (( \sigma_h' ) at any depth is a factor (K) of the vertical effective stress (\sigma_v ') and cohesion (c):

Active:

 \sigma_h' = K_a \sigma_v' - 2c \sqrt{K_a}

Passive:

 \sigma_h' = K_a \sigma_v' + 2c \sqrt{K_p}

At Rest:

 \sigma_h' = K_o \sigma_v'

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