The author suggests that in looking back at the last 10 years of research at the Transport and Road Research Laboratory, and in contemplating the next 10, the most consistent thread is likely to be the importance attached to the realities of the construction site. It is suggested that although the priorities in terms of research subjects will change, realistic assessment of site conditions related to construction processes and site control will still remain a principal factor influencing both cost and structural performance. Illustrated examples, based on past and present research at TRRL are presented in support of this contention. Research in predicting the performance of earth embankments constructed on compressible sub-soils is described. It is suggested that the use of in situ permeability testing to derive a partially 'in situ' value of the coefficient of consolidation has made a major contribution to improved prediction of the rate of settlement on alluvial deposits. Reference is made to methods of analysis and the importance of the dissipation of excess pore-water pressure. A diagram presents a simplified summary of the results of a pilot-scale earth retaining wall study in which a uniformly graded sand was compacted against a 2 M high concrete wall using a 1.3 mg twin-roll vibrating roller. The results are discussed in relation to the compaction process and application to higher walls. The development of methods of classifying fill materials for highway construction purposes is described. Examples are presented and discussed to support the suggestions that (A) a material which is suitable prior to excavation in the cut area, can be rendered unsuitable by the time it is placed in the fill area as a result of the method of handling it and (b) whether or not it will be economical to use a particular soil can be vitally dependent upon the feasible methods available to handle it. The structural performance of buried flexible pipelines is briefly discussed in reference to test pit and field experiments. /TRRL/

  • Availability:
  • Supplemental Notes:
    • Celebration Issue.
  • Corporate Authors:

    Foundation Publications Limited

    7 Ongar Road
    Brentwood CM15 9AU, Essex,   England 
  • Authors:
    • Boden, J B
  • Publication Date: 1978

Media Info

  • Features: Figures; Photos; References;
  • Pagination: p. 47
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00194440
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Jul 11 1979 12:00AM