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DEPTH MEASUREMENTS OF THE VERTICAL DISPLACEMENT OF A SOIL SUBJECTED TO DYNAMIC LOAD

MESURE EN PROFONDEUR DU DEPLACEMENT VERTICAL D'UN SOL SOUS L'ACTION DE CHARGES DYNAMIQUES

The authors describe a simple device for introducing into and recovering from the soil sensors for measuring displacements either directly (displacement sensors, seismographs) or indirectly (geophones, accelerometers). The method consists in sinking a probe into the soil for transmitting details of the movement of the latter. The whole apparatus for direct measurements comprises a duraluminium container inserted at the chosen level, a rigid tube fixed to the container, which emerges at the surface, a displacement sensor that, gives the distance between the upper extremity of the rigid tube and a fixed base of reference, and a recorder which translates the displacement as a function of time. The apparatus for the direct measurements consists of a container partially filled with silastene before immersion of a geophone or accelerometer. The upper part is shaped so that an electric cable can be affixed for transmitting signals. A flexible steel cable fixed to the container enables the latter to be retrieved at the end of the experiment. An example is given of measurements made on a section of railway line near the town of Abbeville. The soil consisted of compressible material over a sand-gravel alluvial layer resting on chalk. /TRRL/

  • Corporate Authors:

    Laboratoire Central des Ponts et Chausees (LCPC)

    Boulevard Lefebvre 58
    Paris Cedex 15,   France  F-75732
  • Authors:
    • Fournier, A
    • Rault, G
  • Publication Date: 1975-11-12

Language

  • French

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00163132
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Analytic
  • Files: ITRD, TRIS
  • Created Date: Mar 14 1978 12:00AM