Earth Pressure at rest, Soil Mechanics

Earth Pressure at rest, Soil Mechanics Notes | Study Soil Mechanics Notes- Agricultural Engineering - Agricultural Engineering

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Earth Pressure at rest

The earth pressure at rest per unit length at a depth of z from the ground surface is expressed as:

${p_0}={K_0}\,\gamma \,z$                                                                                             (25.1)

where $\gamma$ is the unit weight of the soil, K0 is the coefficient of earth pressure at rest. Thus, the earth pressure is zero at the top of a retaining wall and at the base of the wall is K0$\gamma$ H (if H is the height of the wall). The total force per unit length at rest condition acting on a retaining wall of height H is expressed as:

${P_0}={1 \over 2}{K_0}\,\gamma \,{H^2}$                                                                  (25.2)

The force (P0) will act at a height of H/3 from the base of the wall.

For sand and normally consolidated clays, the value of K0 is determined as (Jaky, 1944):

${K_0}=1-\sin \varphi$                                                                                   (25.3)

where ø is the angle of friction of the soil. For over consolidated soil the K0 is expressed as:

${K_0}={K_{0(nc)}}\sqrt {OCR}$                                                                          (25.4)

where OCR is the over consolidation ratio.

The document Earth Pressure at rest, Soil Mechanics Notes | Study Soil Mechanics Notes- Agricultural Engineering - Agricultural Engineering is a part of the Agricultural Engineering Course Soil Mechanics Notes- Agricultural Engineering.
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