COMPARISON OF PILE LOAD TEST- SKIN-FRICTION VALUES AND LABORATORY STRENGTH TESTS

THREE FULL-SCALE BORED CAST-IN-PLACE CONCRETE PILES CONSTRUCTED TO GIVE NO TIP RESISTANCE WERE LOADED TO FAILURE USING THE EQUILIBRIUM METHOD OF LOADING. EACH PILE WAS 24 INCHES (61 CM.) IN DIAMETER, BUT OF DIFFERENT LENGTH, STOPPING IN TURN IN STRATA OF PARTLY SATURATED HIGHLY PLASTIC CLAY, SATURATED SILTY CLAY AND TILL. ULTIMATE SKIN FRICTION VALUES WERE CALCULATED AND COMPARED TO DIRECT SHEAR TESTS, AND LABORATORY AND FIELD VANE TESTS GIVING VALUES OF UNDRAINED SHEAR STRENGTH. THERE WERE LARGE VARIATIONS IN SHEAR STRENGTH RESULTS EVEN AT THE SAME DEPTH IN ADJACENT HOLES. COMPARISON OF VANE TESTS ON SOIL SAMPLES AND ON THE SURFACE OF THE BORED HOLE SHOWED DISTURBANCE CAUSED BY DRILLING TO BE NEGLIGIBLE FOR THESE SOILS. RESULTS FROM AN INTERFACIAL FRICTION DEVICE LOWERED INTO THE HOLE INDICATED THAT THE SKIN FRICTION INCREASED WITH LATERAL STRESS AND THAT THE LATERAL PRESSURE ON THE CONCRETED PILES AT THE TIME OF TESTING WAS LESS THAN 10 POUNDS PER SQUARE INCH. /CGRA/

  • Supplemental Notes:
    • Vol 6, No 3, PP 339-352, 8 FIG, 1 TAB, 2 PHOT, 7 REF
  • Authors:
    • Watt, W G
    • Kurfurts, P J
    • Zeman, Z P
  • Publication Date: 0

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Filing Info

  • Accession Number: 00230969
  • Record Type: Publication
  • Source Agency: CANADIAN GOOD ROADS ASSOCIATION
  • Files: TRIS
  • Created Date: Nov 23 1970 12:00AM