CLOSURE ON ELECTRO-OSMOTIC STABILIZATION OF WEST BRANCH DAM

DISCUSSIONS BY CASAGRANDE AND FUQUAY ADDED VALUABLE INFORMATION CONCERNING ELECTRO-OSMOTIC STABILIZATION AND THE SAMPLING AND TESTING OF THE FOUNDATION. AS SUGGESTED BY CASAGRANDE, A STUDY WAS MADE TO DETERMINE THE VARIANTS IN THE ATTERBERG LIMITS AND MOISTURE CONTENTS BETWEEN THE ANODES AND CATHODES. HOWEVER, THERE WERE INSUFFICIENT DATA TO DETERMINE THE VARIANTS BETWEEN ELECTRODES. AS DISCUSSED BY FUQUAY, SAMPLING OF THE FOUNDATION THROUGH THE FILL AND AT DEPTHS UP TO 130 FEET PROVED TO BE VERY DIFFICULT, SLOW, AND EXPENSIVE. MEASUREMENTS OF PORE PRESSURES, SETTLEMENTS, AND MOVEMENTS HAVE CONTINUED SINCE THE EMBANKMENT WAS COMPLETED. THE EXTENSION OF PIEZOMETER 3-DC WHICH IS TYPICAL OF PIEZOMETERS ALONG THE CREST IS PRESENTED IN A FIGURE, AS WELL AS THE PLOT OF THE PIEZOMETRIC LEVELS IN PIEZOMETER 45-AC. THESE DATA INDICATE, AS SUGGESTED BY FUQUAY, THAT A 4-YEAR TO 5-YEAR DELAY WOULD HAVE BEEN REQUIRED BEFORE RAISING THE EMBANKMENT HAD NOT THE REDUCTION IN PORE PRESSURES BEEN ARTIFICIALLY ACCELERATED. A REVIEW OF THE DATA OBTAINED SINCE THE CLOSURE SECTION WAS COMPLETE INDICATES THAT THE MOVEMENTS ARE MUCH LESS THAN ANTICIPATED AND THAT THE PIEZOMETRIC LEVELS HAVE HAD ONLY A NORMAL INCREASE FROM THE RAISING OF THE RESERVOIR POOL. THE PORE PRESSURES WERE GREATLY REDUCED AND THE FOUNDATION STRENGHTS WERE APPRECIABLY INCREASED, THUS ENABLING THE EMBANKMENT TO BE COMPLETED IN TIME TO RAISE THE RESERVOIR POOL ON THE ORIGINAL SCHEDULE. REFERENCES: ELECTRO-OSMOTIC STABILIZATION OF WEST BRANCH DAM, C. A. FETZER, JOURNAL OF THE SOIL MECHANICS AND FOUNDATIONS DIVISION, PROCEEDINGS OF THE AMERICAN SOCIETY OF CIVIL ENGINEERS, PROCEEDINGS PAPER 5309, JULY 1967.

  • Supplemental Notes:
    • Vol 94, No SM 6, PP 1372-1373, 2 FIG
  • Corporate Authors:

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    ,   United States 
  • Authors:
    • Fetzer, C A
  • Publication Date: 0

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  • Accession Number: 00232596
  • Record Type: Publication
  • Report/Paper Numbers: No SM5, Proc Paper 490
  • Files: TRIS
  • Created Date: Aug 15 2004 2:44AM