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Laboratory experiments on undisturbed specimens of a large number of soft clay deposits, as well as previous measurements

on clays and granular soils, were used to examine and explain the magnitude and behavior of the coefficient

of earth pressure at rest, KO: ( i ) after sedimentation - primary consolidation, (ii) during secondary-compression

aging, (iii) after active or passive preshearing away from the laterally constrained condition, (iv) during a decrease

in effective vertical stress, and (v) during an increase in effective vertical stress in the recompression or compression

range, in terms of K, the slope of the effective horizontal (a;) versus effective vertical (at) stress path. The behavior

of KO is explained using the concept of mobilized angle of friction in laterally constrained deformation condition.

 

The Jaky equation provides, in terms of the angle of internal. friction, a good estimate of KO of sedimented, normally

consolidated young clays and granular soils, as well as of K of presheared clays and sands, and of densified granular

soils that are subjected to laterally constrained compression from oh = a\ = 0. Empirical equations provide

reasonable estimates of KO for clays and granular soils after secondary-compression aging, after preconsolidation by

unloading, and for soft clay deposits that display a preconsolidation pressure o', greater than in situ effective vertical

stress a:,. Proposed empirical equations and methods successfully predict KO of presheared clays.

Key words: coefficient of earth pressure at rest, soft clays, granular soils, presheared soils, sampling and laboratory

testing.

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