MAINE INTERSTATE PROJECT TESTS VERTICAL SAND DRAINS

SOILS UNDERLYING THE TIDAL FLATS AND SURROUNDING LAND AREAS OF PORTLAND, MAINE, ARE DEEP, WEAK, COMPRESSIBLE DEPOSITS OF SILT-CLAYS, SOME OF WHICH LOSE STRENGTH SHARPLY WHEN THEY ARE REMOLDED. INTERSTATE 295 HAD TO BE DESIGNED OVER THIS TYPES OF SENSITIVE CLAY. A PLAN WAS DEVELOPED FOR ELABORATE EXPERIMENTAL VERTICAL SAND DRAIN INSTALLATIONS IN THE CRITICAL AREAS. HUNDREDS OF SAND DRAINS WERE INSTALLED AT THE TEST SITES, USING THREE DIFFERENT METHODS: (1) DRIVING WITH A CLOSED-END MANDREL, (2) JETTING AN OPEN-END MANDREL, AND (3) AUGERING. VARIOUS TEST DEVICES WERE INSTALLED IN THE SAND DRAIN AREAS TO PROVIDE INFORMATION THAT WAS NEEDED TO CONTROL FILL PLACEMENT AND EVALUATE DRAIN PERFORMANCE. THE DEVICES INCLUDE SETTLEMENT PLATFORMS, CONVENTIONAL AND VIBRATING-WIRE PIEZOMETERS, SLOPE INDICATORS AND ALIGNMENT STAKES. A HIGH-PRESSURE OIL PIPELINE MUST BE RELOCATED REQUIRING A HIGH EMBANKMENT TO STABILIZE THE FOUNDATION FOR THE PLANNED PIPELINE CROSSING. THE STABILIZATION FILL FOR THE PIPELINE CROSSING IS ABOUT 450 FT LONG, 250 FT WIDE. ONE SECTION OF IT RISES TO ELEVATION PLUS 40. ALL THE SAND DRAINS UNDER THIS FILL WERE FORMED WITH A DRIVEN, CLOSED-END MANDREL. DATA FROM THESE VERTICAL SAND DRAIN TESTS ARE NOW BEING ANALYZED.

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  • Supplemental Notes:
    • Vol 180, No 15, PP 102-103, 4 PHOT
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  • Accession Number: 00232423
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 15 2004 2:43AM