00232418

Component

http://onlinepubs.trb.org...s/hrr/1968/223/223-001.pdf

METHODS OF STABILITY ANALYSIS ARE REVIEWED FOR SLOPES IN COHESIVE SOILS WHICH HAVE ATTAINED A RELATIVELY HIGH DEGREE OF REFINEMENT. SLOPE STABILITY PROBLEMS IN CLAYS ARE OF TWO GENERAL TYPES: (1) SHORT-TERM STABILITY (END-OF-CONSTRUCTION CASE), AND (2) LONG-TERM STABILITY (STEADY SEEPAGE CASE). THE CASE HISTORIES PRESENTED SHOW THAT FOR SHORT-TERM STABILITY ANALYSIS OF NON-FISSURED CLAYS, THE TOTAL STRESS METHOD IS SATISFACTORY. FOR SHORT-TERM STABILITY OF FISSURED, OVER-CONSOLIDATED CLAYS, THIS METHOD OF ANALYSIS IS NOT SAFE UNLESS A COUNT IS TAKEN OF REDUCED STRENGTH DUE TO THE PRESENCE OF FISSURES. FOR OVER-CONSOLIDATED CLAYS THE RATE AT WHICH THE UNDRAINED SHEAR TEST IS CONDUCTED HAS CONSIDERABLE EFFECT ON THE LABORATORY UNDRAINED SHEAR STRENGTH. FOR LONG-TERM STABILITY OF SLOPES IN NON-FISSURED CLAYS, ANALYSIS ON THE EFFECTIVE STRESS BASIS IS PREFERABLE TO THE TOTAL STRESS METHOD. ASSUMING USE OF THE EFFECTIVE STRESS APPROACH, THE BISHOP METHOD RESULTS IN WHAT APPEARED TO BE BETTER ANALYSES THAN THE CONVENTIONAL METHOD OF SLICES, THE METHOD OF SLICES PRODUCING FACTORS OF SAFETY FOR THE FAILURE STATE WHICH ARE 15 TO 20% TO CONSERVATIVE. EFFECTIVE STRESS METHODS OF ANALYSIS SHOULD ALSO BE USED FOR LONG-TERM STABILITY OF SLOPES IN OVERCONSOLIDATED CLAYS CONTAINING FISSURES OR OTHER DISCONTINUITIES.

Paper sponsored by Committee on Embankments and Earth Slopes and presented at the 47th Annual Meeting. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

01410169

English

pp 1-8

1968

Highway Research Record

Digital/other

Figures (4) ; References (18) ; Tables (4)

Clay; Cohesive soils; Effective stress; Method of slices; Methodology; Overconsolidation; Shear strength; Shear tests; Slope stability; Stability analysis; Structural analysis

Geotechnology; Highways

TRIS, TRB

Aug 15 2004 2:43AM

• EMBANKMENT ANALYSIS AND FIELD CORRELATION
• FURTHER MEASUREMENTS OF FOUNDATION SETTLEMENTS IN THE FT. RANDALL DAM EMBANKMENT
• LABORATORY INVESTIGATION ON THE USE OF HIGH MOISTURE CONTENT SOILS IN HIGH FILLS
• MODIFIED THEORY FOR SEEPAGE CHARACTERISTICS OF A SINGLE GRAVITY WELL
• NONDESTRUCTIVE MEASUREMENT OF SUBGRADE MOISTURE VARIATIONS
• PERMEABILITY OF ANISOTROPIC POROUS MEDIA
• SETTLEMENT OF AN EMBANKMENT RESTING ON A SEMI-INFINITE ELASTIC SOIL
• THE AXISYMMETRIC DEFORMATION OF A HOMOGENEOUS, CROSS- ANISOTROPIC ELASTIC HALF SPACE