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http://onlinepubs.trb.org...rbbulletin/342/342-004.pdf

SATURATED CLAY CHARACTERIZED BY ITS DRY DENSITY AND MOISTURE CONTENT IS DISCUSSED. A CHANGE IN THE MOISTURE CONTENT GIVES ANOTHER MATERIAL WITH OTHER PROPERTIES. ON THIS MATERIAL, THE CLASSICAL LAWS OF RHEOLOGY ARE APPLIED AND THE BEHAVIOR IN SHEAR AND CONSOLIDATION ANALYZED IN THEIR LIGHT. A QUICK ANALYSIS OF THE STATE OF STRESS IN A TRIAXIAL TEST SHOWS THAT THE SHEARS DUE TO THE DEVIATOR OF STRESSES FORM A CIRCULAR CONE TANGENT TO THE OCTAHEDRAL PLANE FOR ANY SYSTEM OF AXES ROTATING AROUND THE AXIS OF THE SAMPLE. FIVE SERIES OF TESTS SHOW THAT IN SATURATED CLAY THE DIRECTIONS OF MAXIMUM SHEAR STRESSES AND STRAINS COINCIDE AND ARE INDEPENDENT OF THE STRESS AT FAILURE. THIS STRESS IS NOT INFLUENCED BY THE ISOTROPIC COMPONENT OF THE STRESS TENSOR, WHICH CAUSES THE MAJOR PART OF THE PORE PRESSURES. THE TESTS SHOW THAT THE MATERIAL HAS NO TRUE YIELD LIMIT AND THAT THE CURVATURE OF THE STRESS-STRAIN DIAGRAM IS INFLUENCED BY THE RATE OF STRAIN AT ALL STRESS LEVELS. FINALLY, CREEP TESTS SHOW THAT THE RATE OF STRAIN AT THE STEADY STAGE IS DEPENDENT ONLY ON THE VALUE OF THE STRESS AND INDEPENDENT OF THE LOAD PATH. THE PRECEDING RESULTS LEAD TO THE CONCLUSION THAT A SATURATED CLAY IS A VISCOELASTIC MATERIAL AND THAT IN ITS STEADY STATE OF CREEP THE LAWS OF THE THEORY OF ELASTICITY REGARDING THE DISTRIBUTION OF STRESSES ARE APPLICABLE. THIS OPENS THE DOOR TO THE WEALTH OF INFORMATION GATHERED IN THE STUDY OF HIGH POLYMERS. A GENERAL RHEOLOGICAL MODEL IS GIVEN AND ANALYZED, TOGETHER WITH POSSIBLE SIMPLIFICATION AND THE MEANINGS AND LIMITATIONS OF THE VARIOUS PARAMETERS. /AUTHOR/

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01410722

Schiffman, Robert L

pp 52-89

1962

Highway Research Board Bulletin

41st Annual Meeting of the Highway Research Board

Print

Appendices (1) ; Figures (23) ; References (66)

Clay; Consolidations; Deformation curve; Deviatoric stress; Dry density; Isotropic materials; Moisture content; Pore pressure; Rheology; Saturated soils; Shear strength; Shear stress; Studies; Triaxial shear tests; Viscoelasticity

Parameters

Geotechnology; Highways

TRIS, TRB, ATRI

Jul 15 1994 12:00AM

• DISTRIBUTION OF STRESSES ON AN UNYIELDING SURFACE BENEATH A PNEUMATIC TIRE
• LATERAL STABILITY OF RIGID POLES SUBJECTED TO A GROUND-LINE THRUST
• STRESS AND STRAIN FACTORS FOR THREE-LAYER ELASTIC SYSTEMS
• STRESSES IN YIELDING SOILS UNDER MOVING WHEELS AND TRACKS
• TABLES OF STRESSES IN THREE-LAYER ELASTIC SYSTEMS
• TABULATED VALUES FOR DETERMINING THE COMPLETE PATTERN OF STRESSES, STRAINS, AND DEFLECTIONS BENEATH A UNIFORM CIRCULAR LOAD ON A HOMOGENEOUS HALF SPACE
• THREE-DIMENSIONAL CONSOLIDATION
• USE OF STRESS LOCI FOR DETERMINATION OF EFFECTIVE STRESS PARAMETERS
• VERTICAL STRESSES IN SUBGRADES BENEATH STATICALLY LOADED FLEXIBLE PAVEMENTS