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Earth pressure at rest (Jaky)

Coefficient of earth pressure at rest of a normally consolidated soil and the force on a stiff wall. Reference: Jaky formula; EN 1997-1 9.5.2.

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# Soil
phi := 30 deg
gamma_s := 18 kN/m^3
H_w := 5 m

# At rest
K_0 := 1 - sin(phi) =
P_0 := 0.5*K_0*gamma_s*H_w^2 = kN/m

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