EMBANKMENT FAILURE ON ORGANIC CLAY

A TEST EMBANKMENT OF GRANULAR FILL WAS CONSTRUCTED IN A PORTLAND, MAINE TIDAL AREA UNDERLAIN BY 25 TO 30 FT OF AN ORGANIC CLAY CONTAINING SHELLS, SAND LENSES, AND WOOD CHIPS. ONE SLOPE FAILED, AND CRACKS DEVELOPED ALONG TWO OTHER SLOPES, AT A FILL HEIGHT OF 12 FT. THE AVERAGE IN SITU UNDRAINED SHEAR STRENGTH, BACK COMPUTED FROM THE FAILURE, EQUAL TO 255 PSF, WAS LESS THAN ONE HALF OF THE AVERAGE STRENGTH MEASURED BY MANY FIELD VANE TESTS. UNCONFINED COMPRESSION TESTS UNDERESTIMATED THE IN SITU STRENGTH, WHEREAS TRIAXIAL UU TESTS WERE ONLY 10% TOO HIGH. FIELD SETTLEMENT DATA WERE A GOOD INDICATIOR OF THE IMPENDING FAILURE OF AN EXTERNAL SLOPE, BUT NOT FOR AN EMBANKMENT HAVING WIDE BERMS. IN THE LATTER CASE, SLOPE INDICATORS AND ALIGNMENT STAKES PROVED MOST USEFUL. THE PIEZOMETERS WERE NOT EFFECTIVE CONTROL DEVICES FOR THIS PARTICULAR SOIL. /RRL(A)/

Media Info

  • Serial:
    • Issue Number: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00232213
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Apr 10 1971 12:00AM