SHAPE FACTORS OF CYLINDRICAL PIEZOMETERS

This paper describes a liquid electric analogue model and a finite difference model used to establish reliable values for the shape factors of cylindrical piezometers with length/diameter ratios of up to 15. For piezometers with length/diameter ratios greater than 4, it was found that the shape factor is given with negligible error by the relationship: F = 7D + 1.65l. An examination of the effect on the shape factor of piezometer proximity to the water-table showed this to be negligible for practical purposes, except where the piezometer is within a few piezometer lengths of the water-table. Shape factors were also established for cylindrical piezometers embedded in cylindrical soil specimens subjected to all five possible boundary conditions. The measured shape factors were higher or lower than the infinite values depending upon the boundary conditions and the proximity of the boundaries to the piezometer. These data give some guidance to the performance of pore pressure probes used in laboratory specimens, and they are useful in the analysis of steady state flow conditions and for the assessment of response studies of piezometer systems. (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00168505
• Corporate Authors:

  Institution of Civil Engineers

  One Great George Street, Westminster
  London,   United Kingdom  SW1P 3AA
• Authors:
  • Brand, E W
  • Premchitt, J
• Publication Date: 1980-12

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 369-384
• Serial:
  • GEOTECHNIQUE
  • Volume: 30
  • Issue Number: 4
  • Publisher: Thomas Telford Limited
  • ISSN: 0016-8505

Subject/Index Terms

• TRT Terms: Analog simulation; Cylinders (Geometry); Diameter; Errors; Finite differences; Length; Location; Performance; Piezometers; Pore pressure; Shape; Water table
• Uncontrolled Terms: Vicinity
• ITRD Terms: 6453: Analog model; 6458: Cylinder (math); 6440: Error; 6460: Finite difference method; 6488: Length; 6107: Piezometer; 6402: Radius; 9073: Shape; 393: Vicinity; 4394: Water table
• Subject Areas: Geotechnology; Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00330859
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Aug 15 1981 12:00AM