IN SITU TESTING OF SOILS USING A SELF-BORING PRESSUREMETER

This short note describes the camkometer developed in England by Wroth and Hughes, which overcomes many of the disadvantages of other in situ soil testing devices. The instrument, a self-boring pressuremeter, is essentially a hollow tube 85 mm in diameter which is slowly pushed into the ground. The displaced soil, reduced to a slurry by a cutter inside the base of the tube, is flushed to the surface by water coming down the central rotating shaft. Around the outside of the tube is a flexible membrane 500 mm long which can be expanded under pressure against the undisturbed soil, the characteristics of which can be assessed by continuously recording the pressure and the expansion. For clays the undrained shear strength, the in situ lateral stress and in situ modulus can be measured. For sand the internal angle of friction and the amount of dilation can be determined. /TRRL/

  • Availability:
  • Corporate Authors:

    Technical Publications Limited

    C.P.O. 3047
    Wellington,   New Zealand 
  • Authors:
    • Hughes, JMO
  • Publication Date: 1978-7

Language

  • English

Media Info

  • Features: Figures; Photos; References;
  • Pagination: p. 151-152
  • Serial:
    • NEW ZEALAND ENGINEERING
    • Volume: 33
    • Issue Number: 7
    • Publisher: Institution of Professional Engineers New Zealand
    • ISSN: 0028-808X

Subject/Index Terms

Filing Info

  • Accession Number: 00189326
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Apr 12 1979 12:00AM