CLOSURE ON STATIC CONE TO COMPUTE STATIC SETTLEMENT OVER SAND

USE OF A FLAT-ENDED PENETROMETER, AS SUGGESTED BY RANANATHAN, RUNS INTO PRACTICAL DIFFICULTIES. WITHOUT THE POSITIVE GUIDE OF THE CONE POINT, THE TIP MAY DRIFT UNPREDICTABLY, A SERIOUS PROBLEM AT SOUNDINGS IN EXCESS OF ABOUT 50 FEET. FURTHERMORE, THE FLAT TIP, INSTEAD OF SHEDDING SOIL DURING ITS ADVANCE, AS DOES THE CONE TIP, TENDS TO TRAP AND CARRY DOWN ITS OWN SOIL PLUG. THE RESEARCH OF GIELLY, LAREAL, AND SANGLERAT INTO PREDICTING THE COMPRESSIBILITY OF COHESIVE SOILS USING STATIC CONE PENTROMETER DATA SUGGESTS THAT THE DRAINED COMPRESSIBILITY OF COHESIVE SOILS MAY RELATE TO THE UNDRAINED STRENGTH CHARACTERISTICS OF SUCH SOILS. THE ENERGY EXPENDED TO ADVANCE THE CONE PENETROMETER, RESULTING IN RADIAL EXPANSION OF A CYLINDER EQUAL TO THE DIAMETER OF THE PENETROMETER TIP, MAY HAVE A FUNDAMENTAL RELATIONSHIP TO THE DISRUPTION AND COMPRESSIBILITY OF THE STRUCTURE OF ANY SOIL. THE CASE STUDIES PRESENTED BY WEBB AND MELVILL ARE A VALUABLE CONTRIBUTION. A MODEL STUDY MADE IN 1968 BY ANNE TOPSHOJ AND SUPERVISED BY THE AUTHOR INVESTIGATED THE RATIO OF EDGE/CENTER SETTLEMENT FOR A FLEXIBLE, UNIFORMLY LOADED, CIRCULAR AREA OF 4.1 INCHES DIAMETER PLACED ON THE SURFACE OF A DRY, UNIFORM, MEDIUM QUARTZ SAND AT A RELATIVE DENSITY OF ABOUT 25%. SHE ALSO TESTED A RIGID PLATE OF THE SAME DIAMETER PLACED ON A LATEX SHEET ON THE SURFACE OF THE SAME SAND IN THE SAME CONDITION AND LOADED TO THE SAME TOTAL LOAD. THE BEARING OF THIS WORK ON THE RESEARCH OF WEBB AND MELVILL IS ILLUSTRATED AND DISCUSSED.

  • Supplemental Notes:
    • Vol 97, No. SM12, PP 1703-1706, 2 FIG, 1 TAB
  • Authors:
    • Schmertmann, J H
  • Publication Date: 1971-12

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Filing Info

  • Accession Number: 00236314
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 2 1972 12:00AM