RESEARCH IN EARTHWORK SPECIFICATION AND CONSTRUCTION

The article describes research projects on specification and control of earthworks and on new methods of earthmoving, carried out by the Transport and Road Research Laboratory over the last fifteen years. Early work showed that statistically a larger number of sand replacement tests would be required for improvement in the accuracy of control. This led to an examination of back-scatter gamma radiation devices in the search for greater speed and repeatability. The article gives the data which led to a rejection of these devices as being both inaccurate and costly. This led to the recent work on an 'end-product' specification. The laboratory's extensive background of testing compaction devices was drawn upon to produce a specification for the control of compaction in terms of the number of passes of compaction equipment required, and this is now in general use. A complete change from traditional earthmoving methods was pioneered by the Laboratory in the form of the author's work on the excavation of cuttings as a 'face' operation, with transport to the fill site by conveyor. The aim of this new system was to reduce to a minimum the exposure of the earth to the elements, leading to a longer working period and less material deemed 'unsuitable' because of excessive moisture content. The article describes the first full scale trial of the system, now in progress on a motorway contract in Hampshire. Four million cubic metres of chalk are being moved an average distance of five kilometres. Before the project was started, an exhaustive study demonstrated its feasibility. /TRRL/

  • Availability:
  • Corporate Authors:

    Foundation Publications Limited

    33 Short Croft
    Doddinghurst, Essex,   England 
  • Authors:
    • PARSONS, A W
  • Publication Date: 1973-11

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 42-50
  • Serial:
    • GROUND ENGINEERING
    • Volume: 6
    • Issue Number: 6
    • Publisher: EMAP CONSTRUCT LIMITED
    • ISSN: 0017-4653

Subject/Index Terms

Filing Info

  • Accession Number: 00083194
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jul 2 1975 12:00AM