RECENT DEVELOPMENTS IN THE CONE PRESSUREMETER

As the name implies, the Cone Pressuremeter (CPM) described in this paper consists of a pressuremeter module which is tipped with a 15CM sq cone. The instrument is pushed into soil using a cone penetrometer rig, and adds to the cone profile data for in situ stiffness and strength at chosen locations in a probing. The analysis of the test curve that the instrument produces is not yet satisfactorily resolved, but indications are that it is as good a tool as any other pressuremeter for determining soil stiffness. This paper concentrates on the measurement of stiffness from expansion tests in clay. The mechanics of the instrument which influence the measurement are assessed, and the calibration procedures in general use are critically examined. Problems with analysis are avoided by presenting the fieldwork results as visual comparisons between the measured test curves for CPM tests and self boring pressuremeter (SBP) tests at the same location. The purpose is not to quote values for strength and stiffness, but to demonstrate the degree to which the two devices plot the same curve. (A) For the covering abstract see IRRD 883023.

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 533-46

Subject/Index Terms

Filing Info

  • Accession Number: 00729286
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-7277-2513-0
  • Files: ITRD
  • Created Date: Dec 12 1996 12:00AM