MEASUREMENT OF RELATIVE DENSITY OF SATURATED SAND USING A PIEZOVANE . FIELD TESTING IN ENGINEERING GEOLOGY. PROCEEDINGS OF THE TWENTY-FOURTH ANNUAL CONFERENCE OF THE ENGINEERING GROUP OF THE GEOLOGICAL SOCIETY, SUNDERLAND POLYTECHNIC, SEPTEMBER 4-8 1988

This article describes laboratory model tests undertaken to investigate the potential use of the piezovane for estimating the relative density of granular soils in situ. The experiments were carried out in a sand column apparatus which consisted of a sand column approximately 200 m in diameter and 1.5 m tall, connected to a mains water supply and mounted on a spring base with a vibrator. Raising the hydraulic gradient to approximately 1.0 fluidized the whole column. Vibrating the bed produced uniformly denser sand according to the amplitude of the vibration used. Miniature pore water pressure transducers placed either in the sand or within the model piezovane instruments were monitored using a fast data logger taking a full set of readings at 1 second intervals. Model vanes and piezovanes were placed or pushed into the sand to a position near the bottom of the bed. The vanes were mounted on 16 m diameter rods which could be rotated using a lever arm thus allowing control of the rate of rotation. These model vanes were a combination of a 60 degree cone and a vane with various height to diameter ratios. Loose beds were prepared in the sand column by fluizization and re-deposition. Denser beds were formed by vibrating loose beds at different amplitudes. After preparation of the sand bed the tests consisted of a single 90 degree rotation of the vane. Measurements were made of pore pressure changes during rotation and after rotation as excess pore pressures dissipated to their steady state hydrostatic values. Tests were carried out at various sand densities with vanes and piezovanes of different dimensions and with pore pressure transducers in different locations. The vanes were also rotated at different speeds. The results were obtained as measurements of excess pore pressure with time during vane rotation and during subsequent dissipation. They showed clear relationships between relative density and pore pressures measured by the piezovane. For the covering abstract of the conference see IRRD 832042.

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    GEOLOGICAL SOCIETY PUBLISHING HOUSE

    UNIT 7, BRASSMILL ENTERPRISE CENTRE, BRASSMILL LANE
    BATH,   United Kingdom  BA1 3JN
  • Authors:
    • ATKINSON, J H
    • Jessett, C A
  • Publication Date: 1990

Language

  • English

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  • Accession Number: 00607164
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 0-903317-51-6
  • Files: ITRD, TRIS
  • Created Date: Mar 31 1991 12:00AM