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.


  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 295-301
  • Serial:

Subject/Index Terms

Filing Info

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