REPORT OF COMMITTEE ON FLEXIBLE TYPE SURFACES, WHAT WE KNOW ABOUT THE DESIGN OF PAVEMENTS OF THE FLEXIBLE TYPE

A DIGEST AND DISCUSSION OF PUBLISHED MATERIAL ON FLEXIBLE PAVEMENT DESIGN WAS PRESENTED. IT WAS FELT THAT ADEQUATE INFORMATION WAS LACKING CONCERNING THE QUANTITATIVE BEARING CAPACITY OF SUBGRADES, AT LEAST THE TYPE OF INFORMATION SUITABLE FOR USE IN DESIGN FORMULAS. THE FORMULAS WERE BASED ON THE STATIC APPROACH ALTHOUGH PRESSURES IMPOSED ON SUBGRADES ARE SELDOM PURELY STATIC. PRESSURE DISTRIBUTION MAY NOT ONLY DEPEND UPON THE CHARACTER OF THE SUBGRADE SOIL BUT TO A MARKED EXTEND UPON THE DEGREE OF FLEXIBILITY OF THE ROAD SURFACE. THE MORE THE FACTOR OF SUBGRADE SUPPORT ENTERS INTO THE PERFORMANCE OF A ROAD SURFACE THE MORE NECESSARY IT BECOMES TO TAKE INTO ACCOUNT THE DYNAMIC PROPERTIES OF THE SUBGRADE SOIL. A GERMAN OSCILLATOR METHOD OF TESTING APPEARED TO HAVE POSSIBILITIES FOR STUDYING THE DYNAMIC PROPERTIES OF SOILS AND ROAD SURFACES. METHODS OF DESIGN OF FLEXIBLE PAVEMENTS WERE CONSIDERED AS PREMISED MORE UPON THEORETICAL CONCEPTIONS OF SOIL RESISTANCE AND PRESSURE DISTRIBUTION THAN UPON PERTINENT OR COMPREHENSIVE TEST DATA. MAJOR PARTS OF THE GENERAL PROBLEM THAT NEEDED ATTENTION WERE ITEMIZED. THEY INCLUDE: (1) A STUDY OF THE LOAD SUPPORTING AND PRESSURE-DISTRIBUTING ABILITY OF TYPICAL SURFACES OF THE NONRIGID TYPE, (2) THE DEVELOPMENT OF DATA THAT INDICATED MORE DIRECTLY THE SAFE LOAD-SUPPORTING VALUE OF SOILS WHEN SUBJECT TO FORCES AND DISPLACEMENTS SUCH AS OBTAINED UNDER ROAD SURFACES OF THE NON-RIGID TYPE, AND (3) THE DETERMINATION OF THE RELATIVE EFFECTS OF SLOWLY APPLIED AND SUDDENLY APPLIED FORCES IN ORDER THAT THE CRITICAL LOAD FOR DESIGN PURPOSES MAY BE KNOWN.

  • Supplemental Notes:
    • Vol 17, ParT I, PP 144-148; part of Report of Department of Design
  • Authors:
    • Benkelman, A C
    • Krynine, D P
    • Buchanan, J A
    • Smith, R
  • Publication Date: 1938

Media Info

  • Monograph Title: Proceedings of the Seventeenth Annual Meeting of the Highway Research Board Held at Washington, D.C. November 30, December 1, 2, 3, 1937. Part I
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00205826
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 1971 12:00AM