RESULTS OF A LOADING TEST ON QUICK CLAY AT MASTEMYR, OSLO /IN NORWEGIAN/

IN ORDER TO STUDY IN DETAIL THE MECHANISM OF FAILURE IN QUICK CLAY, A LARGE LOADING TEST WAS CARRIED OUT DURING THE AUTUMN OF 1968. THE TEST FILL CONSISTING OF SAND HAD A BASE DIAMETER OF 20 M AND SLOPE ANGLES OF 45 DEGREES. SUBSURFACE CONDITIONS CONSISTED OF 2 M OF PEAT OVERLYING 15-20 M OF QUICK CLAY WITH A VANE SHEAR STRENGTH OF 0.9-1.5 T/SQ. M. FAILURE OCCURRED BELOW THE FILL 18 DAYS AFTER THE START OF THE TEST WHEN THE LOAD HAD REACHED A VALUE OF 4.3 T/SQ. M. DURING LOADING ONLY SMALL DEFORMATIONS WERE OBSERVED ALTHOUGH THE FIRST LOCAL FAILURE OCCURRED IN THE CLAY AT A LOAD EQUIVALENT TO HALF THE ULTIMATE LOAD. HOWEVER, IMMEDIATELY AFTER THE APPEARANCE OF PLASTIC DEFORMATIONS, THE CLAY BEGAN TO SETTLE. THE SAFETY FACTOR AT FAILURE WAS 1.14 IF CALCULATIONS WERE BASED ON THE VANE SHEAR STRENGTH AND A BEARING CAPACITY FACTOR CORRESPONDING TO FLEXIBLE CIRCULAR FOUNDATIONS. BELOW THE CENTRE OF THE FILL, PORE PRESSURE MEASUREMENTS CORRESPONDED TO THOSE CALCULATED FOR AN ISOTROPIC ELASTIC MATERIAL, WHEREAS THE PORE PRESSURES BELOW THE PERIPHERY WERE 30-40% HIGHER THAN EXPECTED FROM THEORY. /SVV/TRRL/

  • Authors:
    • Clausen, C J
  • Publication Date: 1970

Language

  • English

Media Info

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Filing Info

  • Accession Number: 00235278
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: Jun 11 1972 12:00AM