DETECTION OF NEAR-SURFACE RIGID LAYER SUBGRADE WITH SPECTRAL-ANALYSIS-OF-SURFACE-WAVES METHOD . THIRD INTERNATIONAL CONFERENCE ON BEARING CAPACITY OF ROADS AND AIRFIELDS. PROCEEDINGS, NORWEGIAN INSTITUTE OF TECHNOLOGY, TRONDHEIM, NORWAY, JULY 3-5 1990. VOLUMES 1-2

This paper discusses two case studies, where the falling weight deflectometer (FWD) and spectral-analysis-of-surface-waves (SASW) method were used side-by-side and simultaneously. In each case: (1) there was a rigid layer between 2 and 5 metres from the pavement surface; (2) two pavement sections, located within a few hundred metres of each other, had identical pavement construction but different depths to rigid layers. It was therefore possible to study the effect of the depth of the rigid layer on the distribution of stresses and strains within the pavement systems and on the remaining lives of the pavements. The authors conclude from these case studies that: (1) in order to model the behaviour of pavements accurately, the location of the near-surface rigid layer should be known, especially when a FWD is used to characterise materials; (2) the strains and stresses within the pavement may be underestimated greatly if this layer is not considered; (3) the SASW method can be used effectively to determine the depth to rigid layers accurately; (4) in the presence of bedrock, the SASW method yields more consistent modulus profiles; (5) in many investigative, diagnostic and project-level studies, it may be desirable to use the SASW method. (TRRL)

  • Availability:
  • Corporate Authors:

    Tapir

    Trondheim University, Gloeshaugen
    Trondheim-NTH,   Norway 
  • Authors:
    • Nazanan, S
  • Publication Date: 1990

Language

  • English

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Filing Info

  • Accession Number: 00612262
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 82-519-1033-1
  • Files: ITRD, TRIS
  • Created Date: Aug 31 1991 12:00AM