EVALUATION OF SURFACE SHEAR STRENGTH MEASUREMENTS FOR USE IN LABORATORY MOBILITY STUDIES

LABORATORY TESTS WERE CONDUCTED TO DETERMINE WHICH METHOD OF OBTAINING FIVE DIFFERENT SOIL-TO-RUBBER SHEAR MEASUREMENTS WITH TWO ROTARY-SHEAR DEVICES, A COHRON SHEARGRAPH AND A SPLINE SHEAR DEVICE, WOULD PRODUCE THE MOST CONSISTENT MEASUREMENTS OR QUALITATIVE INDEXES OF SURFACE SOIL STRENGTH. THE TESTS WERE MADE AT 34.5-, 68.9-, AND 103.4-KN/M2 NORMAL PRESSURES PRESSURES ON A FAT CLAY WHOSE SURFACE MOISTURE CONTENT RANGED FROM 26.5 TO 45.9 PERCENT. IT WAS FOUND THAT PEAK SHEAR MEASUREMENTS FOR THE FULL RANGE OF SOIL STRENGTHS USED COULD BE OBTAINED ONLY AT THE NORMAL PRESSURE OF 34.5 KN/(M)2 BECAUSE OF EXCESSIVE SINKAGE OF THE SHEAR HEAD AT THE HIGHER NORMAL PRESSURES OF THE SOFTER SOIL. THE PEAK SHEAR MEASUREMENTS WITH THE COHRON SHEARGRAPH, WITH AN IN-AIR CALIBRATION, AT A NORMAL PRESSURE OF 34.5 KN./(M)2 WERE THE MOST CONSISTENT AND ARE RECOMMENDED FOR FURTHER STUDY TO DETERMINE THEIR VALIDITY IN SURFACE CONDITION-VEHICLE PERFORMANCE RESEARCH. /AUTHOR/

  • Supplemental Notes:
    • MISC PAPER M-72-5
  • Authors:
    • Patin, T R
  • Publication Date: 1972-5

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Filing Info

  • Accession Number: 00236388
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 3 1972 12:00AM