Factors Affecting Coefficient of Earth Pressure Ko

by Kamal Z. Andrawes, Lect.; Civ. Engrg. Dept., Univ. of Strathclyde, Glasgow, Scotland, U.K.,
Mohamed A. El-Sohby, Lect.; Fac. of Engrg., Azhar Univ., Cairo, Egypt,

Serial Information: Journal of the Soil Mechanics and Foundations Division, 1973, Vol. 99, Issue 7, Pg. 527-539

Document Type: Journal Paper


The coefficient of earth pressure at rest can be accurately determined by conducting constant stress ratio tests in the triaxial apparatus (interpolation method). This method is stress controlled and thus the errors in strain measurements do not interfere with the test procedure and can be corrected for after the test is finished. Strains in a Ko increases with: (1) the increase in porosity, decrease in φμ, crushing; and (2) the increase in the modulus of elasticity of the particles mineral. The effects of allowing small lateral strains and the restraining direction on the value of Ko are examined.

Subject Headings: Strain | Soil pressure | Triaxial tests | Triaxial loads | Equipment and machinery | Errors (statistics) | Porosity | Elasticity

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