EXTRUSION OF SOIL SAMPLES FROM THIN-WALLED TUBES

THE DESIGN AND OPERATION OF A JIG FOR USE IN EXTRUDING INTACT SOIL SAMPLES FROM TUBES, USUALLY IN THE LABORATORY, ARE DESCRIBED IN DETAIL. SAMPLE TUBES ARE ASSEMBLED IN THE JIG SO THAT SAMPLES ARE EXTRUDED IN THE SAME DIRECTION AS THEY ENTERED THE TUBE, THUS AVOIDING STRESS AND STRAIN REVERSAL. PLUNGER DIAMETER IS LESS THAN TUBE DIAMETER TO ENSURE AGAINST SCRAPING. SAMPLE LENGTH IS MEASURED TO PERMIT DETERMINATION OF DEPTH BELOW GROUND AND AMOUNT OF REMAINDER. A WOODEN DISC MAKES A FIRM FIT INSIDE THE TUBE TO DISTRIBUTE PLUNGER FORCE UNIFORMLY AND PROVIDE COMPLETE, CLEAN EXTRUSION. THE JIG CAP IS REMOVED AND THE TUBE WITH DISC IS INSERTED CUTTING EDGE DOWN, AFTER WHICH THE CAP IS SCREWED HOME. THE TWO HOLES IN THE SAMPLE TUBE ARE FILLED FLUSH TO MINIMIZE DISTURBANCE TO SAMPLE SIDES. WHEN CUTTING CYLINDRICAL TEST SPECIMENS, THE TOP SURFACE OF THE CAP CAN BE USED AS A GUIDE FOR TRIMMING ONE END OF THE SPECIMEN SQUARE.

  • Supplemental Notes:
    • Tech Memo 1, 6 PP, 2 FIG, 1 REF
  • Corporate Authors:

    Commonwealth Scientific Indus Res Org, Australia

    Division of Applied Geomechanics
    East Melbourne, Victoria,   Australia 
  • Authors:
    • Lang, J G
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00229906
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 28 1970 12:00AM