Lateral Earth Pressure “At Rest”

Abstract

Under conditions where there is no lateral strain within the ground mass, the value of the lateral soil pressure is commonly called the lateral earth pressure at rest (K₀). Sometimes it is also defined as the neutral lateral earth pressure or the lateral earth pressure at consolidated equilibrium. The ratio of lateral to vertical earth pressure in this “no lateral strain” condition is termed the coefficient of earth pressure at rest, K₀ = σ₃/σ₁. Here σ₃ is the principal horizontal stress and σ₁ is the principal vertical stress, both in a soil mass having a cylindrical form of test apparatus.

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