CONSOLIDATION CHARACTERISTICS OF PHOSPHATIC CLAYS

Reliable and convenient testing technique and analysis are used to assess the void ratio-effective stress and void ratio-permeability relations for an array of very soft phosphatic waste clays. The methodology is based on the seepage-induced consolidation test in which a soft soil sample is subjected to a constant downward flow rate and its final consolidated height and bottom effective stress are measured as the sample approaches steady state conditions. The two data points and the measured zero effective stress void ratio represent three reliable experimental data in the low range of effective stress, where the consolidation constitutive relations are highly nonlinear. For the higher effective stress range, the loading and permeability tests are used to derive the coefficient of permeability and effective stress relating to a given void ratio. The authors use an efficient algorithm to describe the steady-state flow in soft soils and a parameter-estimation scheme to determine the soil consolidation parameters necessary for finite strain consolidation theory. Results obtained from the seepage-induced consolidation testing and analysis are verified by laboratory data of the restricted flow and transient seepage-induced consolidation tests and field measurements in three phosphatic clay settling ponds.

• Availability:
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• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Abu-Hejleh, A N
  • Znidarcic, D
  • Barnes, B L
• Publication Date: 1996-4

Language

• English

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 295-301
• Serial:
  • Journal of Geotechnical Engineering
  • Volume: 122
  • Issue Number: 4
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9410

Subject/Index Terms

• TRT Terms: Analysis; Clay; Consolidation; Effective stress; Permeability; Phosphates; Soil stabilization; Steady state; Testing; Void ratios
• Uncontrolled Terms: Parameters
• Old TRIS Terms: Steady-state conditions
• Subject Areas: Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 00720423
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 16 1996 12:00AM