At-Rest Lateral Earth Pressure of Consolidating Clay

by Mohamed Salah Abdelhamid, (A.M.ASCE), Staff Engr.; Dames and Moore, Cranford, N.J.; formerly, Grad. Student, Dept. of Civ. Engrg., Technological Inst., Northwestern Univ., Evanston, Ill.,
Raymond J. Krizek, (M.ASCE), Prof.; Dept. of Civ. Engrg., Technological Inst., Northwestern Univ., Evanston, Ill.,

Serial Information: Journal of the Geotechnical Engineering Division, 1976, Vol. 102, Issue 7, Pg. 721-738

Document Type: Journal Paper


Two clay slurries with different controlled chemistries (flocculated and dispersed) were consolidated in large-diameter rigid cylindrical slurry consolidometers. During two cycles of consolidation and rebound, the axial deformations, pore pressure, and both axial and radial stresses were measured directly, thereby providing a continuous record of the stress and strain history of each sample. The coefficient of lateral earth pressure at-rest, Ko, was found to remain essentially constant during the loading phase of a loading-unloading cycle, but its value increased gradually during unloading until it exceeded unity when the overconsolidation ratio was about 2. Several indirect approaches were used to compute Ko from shear strength parameters determined from triaxial compression tests on specimens trimmed from block samples of the same two clays for which direct measurements were obtained, and the results were found to be in good agreement. Within the scope of the test data, neither pore fluid chemistry nor the associated clay fabric exerted much influence of the measured (during loading) values of Ko, which were in the range of 0.70 ±0.05.

Subject Headings: Soil pressure | Consolidated soils | Axial forces | Load factors | Triaxial tests | Lateral pressure | Clays | Slurries

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