THE INFLUENCE OF GEOLOGICAL FEATURES OF CLAY DEPOSITS ON THE THE DESIGN AND PERFORMANCE OF SAND DRAINS

SAND DRAINS HAVE BEEN USED TO ACCELERATE THE CONSOLIDATION OF SOFT CLAY FOUNDATIONS OF EMBANKMENTS FOR OVER 30 YEARS. DURING THIS PERIOD MANY OBSERVATIONS OF FIELD RATES OF SETTLEMENT AND AN INCREASING NUMBER OF PORE PRESSURE MEASUREMENTS HAVE LED TO INCONCLUSIVE OPINIONS AS TO THE EFFICIENCY OF SAND DRAIN INSTALLATIONS. FOLLOWING A REVIEW OF THE LITERATURE, THE RESULTS OF RECENT FIELD MEASUREMENTS OF RATES OF SETTLEMENT AND PORE PRESSURE DISSIPATION OF CLAY FOUNDATION FOR EARTH EMBANKMENTS WITH AND WITHOUT SAND DRAIN INSTALLATIONS ARE COMPARED WITH PREDICTIONS BASED ON LABORATORY AND IN SITU TESTS. IT IS SHOWN THAT THE REAL DRAINAGE BEHAVIOR OF A DEPOSIT AS A WHOLE DEPENDS ON THE GEOLOGICAL DETAILS OF ITS FORMATION. QUITE SMALL LAYERS, VEINS OF SILT ALONG FISSURES, OR ORGANIC INCLUSIONS CAN TRANSFORM THE PERMEABILITY OF THE MASS COMPARED WITH THAT OF SMALL SAMPLES. /RRL/AUTHOR/

Media Info

  • Serial:
    • Issue Number: 0

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Filing Info

  • Accession Number: 00232109
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Mar 15 1971 12:00AM