BACK-CALCULATED MODULI AS A FUNCTION OF THE LAYERED MODEL ASSUMPTION

The procedure of obtaining pavement-layer and subgrade moduli from deflection basin back-calculation analyses is expressed through a large variety of differing calculation programs. These programs render non-uniform solutions and in certain cases may even lead to erroneous conclusions. Moreover, for any given program, the initial input assumptions influence the moduli output. The influence of these assumptions on the output derived from the MODULUS program code is demonstrated in this paper. Two local measurements projects serve as striking proof that the nature of the derived solutions depends on the calculation assumptions. Consequently, the engineering feasibility of the obtained moduli must be checked carefully in every case. In other words, the calculation results must never be accepted as supplementary data. In addition to that, the variability of the results may prevent using them for identifying points of weakness and even for checking their actual existence. In any case, the findings clearly demonstrated the need for running statistical analyses in order to detect outlying values among the entire output of back-calculated results. Finally, the findings of the present paper are not capable of recommending a specific input for the initial assumptions discussed. In fact, no such general rule can ever be displayed, as the nature of the measured deflection bowls varies from place to place. (A) For the covering abstract see ITRD E104741.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/8390730472
• Corporate Authors:

  ROAD AND BRIDGE RESEARCH INSTITUTE

  UL JAGIELLONSKA 80
  WARSAW,   Poland  03-301
• Authors:
  • Livneh, Moshe
• Conference:
  • PROCEEDINGS OF THE DURABLE AND SAFE ROAD PAVEMENTS, V INTERNATIONAL CONFERENCE, HELD KIELCE, POLAND, 11-12 MAY 1999. VOLUME 2
• Publication Date: 1999

Language

• English

Media Info

• Features: References;
• Pagination: p. 301-9

Subject/Index Terms

• TRT Terms: Base course (Pavements); Deflection; Pavement design; Pavement layers
• ITRD Terms: 5586: Deflection; 2952: Layer; 3055: Pavement design; 2961: Roadbase
• Subject Areas: Highways; Pavements;

Filing Info

• Accession Number: 00792985
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 83-907304-7-2
• Files: ITRD
• Created Date: May 31 2000 12:00AM