Free field measurements of stresses and strains in soils

This paper describes the use of embedded soil pressure cells and strain coils to measure stresses and strains in sands. It is shown that particular attention must be given to placement and calibration techniques in order to obtain reliable results. The earth pressure cells have been previously described and further recommendations for calibration are given. Their use in measuring stresses beneath a road pavement is described. These measurements, extending over a period of many months, indicated the suitability of the cells in adverse conditions. Details of the construction of the strain coils are given. The coils, based on an overseas design, operate on a null principle by balancing the output of a pair placed within the soil mass with a reference pair mounted outside and altered in spacing by a micrometer. The various measuring circuits are described and placement procedures in granular materials outlined. Particular attention is given to sources of error (A).


  • English

Media Info

  • Pagination: 1743-60
  • Serial:
    • Volume: 4
    • Issue Number: 2

Subject/Index Terms

Filing Info

  • Accession Number: 01441608
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Aug 24 2012 11:46PM