PAVEMENT DESIGN AND PERFORMANCE STUDY - PHASE B: DEFLECTION STUDY- SUBGRADE EVALUATION BASED ON THEORETICAL

EVALUATIONS OF PAVEMENT SOIL SUBGRADES FOR DESIGN PURPOSES ARE MOSTLY BASED ON EMPIRICAL METHODS SUCH AS THE CALIFORNIA BEARING RATIO (CBR), CALIFORNIA SOIL RESISTANCE METHOD, ETC. IT IS ESSENTIAL, FOR RATIONAL DESIGN TECHNIQUES, TO APPLY THEORY AND EVALUATE SUBGRADE STRENGTH IN TERMS OF THE MODULUS OF ELASTICITY IN PLACE OF EMPIRICAL METHODS. THE MAXIMUM DEFLECTION OF THE PAVEMENT AND THE SHAPE OF THE DEFLECTED BASIN WERE UTILIZED TO DETERMINE THE MODULUS OF ELASTICITY OF THE SUBGRADE. THE SHAPE OF THE DEFLECTED BASIN CAN BE DEFINED BY "SPREADABILITY", WHICH IS DEFINED AS THE AVERAGE DEFLECTION EXPRESSED AS A PERCENTAGE OF THE MAXIMUM DEFLECTION. SPREADABILITY INDICATES WHETHER THE UPPER LAYER IS WEAKER THAN THE LOWER LAYER AND VICE VERSA. AN EVALUATION CHART WAS DEVELOPED TO DETERMINE THE MODULUS OF ELASTICITY OF THE SUBGRADE WHEN THE MAXIMUM AND FOUR OTHER DEFLECTIONS IN THE DEFLECTED BASIN ARE KNOWN. THE SAME PRINCIPLE CAN BE APPLIED TO DEVELOP A SIMILAR TYPE OF EVALUATION CHARTS. /AUTHOR/

• Supplemental Notes:
  • Interim RepORT NO 2, VHRC 70-R29, 23 PP, 8 FIG, 2 TAB, 3 REF
• Corporate Authors:

  Virginia Highway Research Council

  Charlottesville, VA  United States 
• Authors:
  • Vaswani, N K
• Publication Date: 1971-2

Subject/Index Terms

• TRT Terms: Charts; Deflection; Design; Evaluation; Modulus of elasticity; Shape; Soils; Subgrade (Pavements); Theory
• Old TRIS Terms: Basins; Layered system mechanics
• Subject Areas: Design; Geotechnology; Highways; Pavements;

Filing Info

• Accession Number: 00207276
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 22 1971 12:00AM