STABILIZATION OF SOILS SUBJECT TO HYDROCOMPACTION

TWENTY MILES OF THE 110 MILE LONG SAN LUIS CANAL, IS IN LOW DENSITY SOILS WHICH COLLAPSE WHEN WATER IS APPLIED TO THEM FOR THE FIRST TIME. THESE SOILS, HIGH IN MONTMOTILLONITE, ARE INTER-FAN DEPOSITS BETWEEN MAJOR DRAINAGES, AND HAVE NOT BEEN SATURATED SINCE DEPOSITION. TO DELINEATE THE AREAS SUBJECT TO HYDROCOMPACTION, MORE THAN 400 HOLES WERE DRILLED AND SAMPLES TAKEN FOR MOISTURE AND DENSITY DETERMINATIONS, GRADATION AND ATTERBERG LIMITS. SIX 125 FT SQ TEST PONDS WERE INSTALLED AND OBSERVED FOR PERIODS UP TO 1 YR PRIOR TO DESIGN OF THE CANAL. THOSE AREAS SUBJECT TO HYDROCOMPACTION WERE TREATED BY PONDING WATER AND SATURATING THE SOIL TO THE WATER TABLE. PRIOR TO THIS TREATMENT, THE AVERAGE SOIL DENSITIES IN THE SUBSIDABLE AREAS WERE IN THE 85-95 LB RANGE. AFTER SATURATION FOR ABOUT 1 YR, DENSITIES WERE IN THE 90-100 LB RANGE. SETTLEMENTS WERE EXTREMELY ERRATIC, RANGING UP TO 5 FT GENERALLY, AND LOCALLY TO AS MUCH AS 8 FT. THE INITIAL SUBSIDENCE RATE WAS AS MUCH AS 1.5 FT/MONTH, THEN STABILIZED AT AN AVERAGE OF ABOUT 0.10 FT/MONTH, AFTER 3-6 MONTHS. COMPLETE STABILIZATION WAS NEVER ACHIEVED, HOWEVER, THE REMAINING SUBSIDENCE IS BELIEVED TO BE OF SUCH MAGNITUDE THAT IT WILL NOT SERIOUSLY AFFECT THE CONSTRUCTION OR OPERATION OF THE CANAL. /AUTHOR/

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  • Supplemental Notes:
    • Vol2,no 2,pP 47-58, 8 FIG, 4 REF
  • Authors:
    • Hall, C E
    • Carlson, J W
  • Publication Date: 0

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  • Accession Number: 00231103
  • Record Type: Publication
  • Source Agency: Geoscience Abstracts
  • Files: TRIS
  • Created Date: Aug 15 2004 2:41AM