A NEW ONE-DIMENSIONAL CONSOLIDATION TEST

THE EXPERIMENTAL TECHNIQUES COMMONLY USED TO OBTAIN THE ONE-DIMENSIONAL COMPRESSION CHARACTERISTICS OF SOFT, IMPERMEABLE SOILS, SUCH AS CLAYS, ARE CRITICALLY REVIEWED. A GENERAL PURPOSE CONSOLIDOMETER HAS BEEN DESIGNED AND CONSTRUCTED FOR LABORATORY DETERMINATION OF THE STRESS- STRAIN AND TIME RATE OF CONSOLIDATION BEHAVIOR OF SOILS IN ONE-DIMENSIONAL COMPRESSION. SPECIAL FEATURES INCORPORATED IN THE DESIGN INCLUDE: (1) LOAD APPLIED INCREMENTALLY, AT A CONSTANT RATE OF STRESS AND AT A CONSTANT RATE OF STRAIN, (2) BACK PRESSURING FOR SATURATION, (3) MEASUREMENT OF RESIDUAL PORE PRESSURE AND/OR SWELL PRESSURE, (4) MEASUREMENT OF EXCESS PORE WATER PRESSURES AT THE IMPERVIOUS BASE, AND (5) FULL AUTOMATION DURING THE CONSOLIDATION PROCESS. SOLUTIONS TO THE TERZAGHI ONE-DIMENSIONAL CONSOLIDATION EQUATION ARE PRESENTED FOR THE CONDITION OF CONSTANT RATE OF STRAIN (CRS) ASSUMING THE SOIL HAS A CONSTANT COEFFICIENT OF COMPRESSIBILITY OR A CONSTANT COMPRESSION INDEX. FROM A LABORATORY TESTING PROGRAM ON ARTIFICIALLY SEDIMENTED BOSTON BLUE CLAY USING THE GENERAL PURPOSE CONSOLIDOMETER IT IS SHOWN THAT THE RESULTS OF CONSOLIDATION TESTS CONDUCTED AT (CRS) ARE USUALLY IN GOOD AGREEMENT WITH RESULTS FROM THE CONVENTIONAL INCREMENTAL TEST. IN ADDITION, THE CRS TEST IS SHOWN TO HAVE THE FOLLOWING ADVANTAGES OVER THE STANDARD INCREMENTAL TEST: (1) THE DURATION OF A TEST IS REDUCED FROM SEVERAL WEEKS TO SEVERAL DAYS, (2) THE STRESS-STRAIN AND CONSOLIDATION BEHAVIOR IS OBTAINED CONTINUOUSLY THROUGHOUT THE TEST. THE MAXIMUM PAST PRESSURE IS THEREFORE BETTER DEFINED, (3) THE CRS TEST CAN BE CONDUCTED AT SMALL HYDRAULIC GRADIENTS THAT MORE CLOSELY SIMULATE FIELD CONDITIONS, AND (4) THE CRS TEST IS READILY AUTOMATED. /AUTHOR/

• Supplemental Notes:
  • No R69-9, 161 PP, 62 FIG, 6 TAB, 1 PHOT, REFS, 5 APP
• Authors:
  • Wissa, A E
  • Heiberg, S
• Publication Date: 0

Media Info

• Serial:
  • Mass Inst Tech Dept Civ Eng Res Rept

Subject/Index Terms

• TRT Terms: Automation; Clay; Consolidation; Consolidometers; Deformation curve; Mathematical analysis; Pore pressure; Pore water pressures; Soil consolidation test; Soils; Testing equipment
• Uncontrolled Terms: Soil consolidation
• Old TRIS Terms: Consolidation rate; One dimensional consolidation
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00229714
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 15 2004 1:50AM