Consolidation Characteristics of Phosphatic Clays
Publication: Journal of Geotechnical Engineering
Volume 122, Issue 4
Abstract
Reliable and convenient testing technique and analysis are used to evaluate the void ratio-effective stress and void ratio-permeability relations for several types of very soft phosphatic waste clays. The technique 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 reaches steady state conditions. These 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. In the higher effective stress range, the loading and permeability tests are used to determine the coefficient of permeability and effective stress corresponding to a given void ratio. An efficient algorithm to describe the steady-state flow in soft soils and a parameter-estimation scheme are employed for the determination of the soil consolidation parameters needed in the finite strain consolidation theory. The laboratory data of the restricted flow test and the transient seepage-induced consolidation test and the field measurements in three phosphatic clay settling ponds confirm the results obtained from the seepage-induced consolidation testing and analysis.
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References
1.
Abu-Hejleh, A. N., and Znidarčić, D. (1992). “User manual for computer program SICTA.”Rep. Prepared for FIPR, Dept. of Civ. Engrg., Univ. of Colorado, Boulder, Colo.
2.
Abu-Hejleh, A. N., Znidarčić, D., and Robertson, A. (1992). “Results of seepage induced consolidation tests on phosphatic clays.”Rep. Prepared for FIPR, Dept. of Civ. Engrg., Univ. of Colorado, Boulder, Colo.
3.
Abu-Hejleh, A. N. (1993). “Desiccation theory for soft soils,” PhD dissertation, Dept. of Civ. Engrg., Univ. of Colorado, Boulder, Colo.
4.
Abu-Hejleh, A. N., and Znidarčić, D. (1994). “Estimation of the consolidation constitutive relations.”8th Int. Conf. on Comp. Methods and Adv. in Geomech. (IACMAG94), H. J. Siriwardane and M. M. Zaman, eds., Morgantown, W.Va., 499–504.
5.
Aiban, S. A., and Znidarčić, D.(1989). “Evaluation of the flow pump and constant head techniques for permeability measurements.”Géotechnique, London, U.K., 39(4), 655–666.
6.
Al-Tabbaa, A., and Wood, D. M.(1987). “Some measurements of the permeability of kaolin.”Géotechnique, London, U.K., 37(4), 499–503.
7.
Alva-Hurtado, J. E., and Selig, E. T. (1981). “Survey of laboratory devices for measuring soil volume change.” ASTM Geotech. Testing J., 4, 11–18.
8.
Been, K., and Sills, G. C.(1981). “Self-weight consolidation of soft soils: an experimental and theoretical study.”Géotechnique, London, U.K., 31(4), 519–535.
9.
Cargill, K. W. (1986). “The large strain consolidation controlled rate of strain (LSCRS) device for consolidation testing of soft fine-grained soils.”Tech. Rep. GL-86-13, U.S. Army Engineer Waterways Experiment Station, Vicksburg, Miss.
10.
Carrier, W. D., Bromwell, L. G., and Somogyi, F.(1983). “Design capacity of slurried mineral waste ponds.”J. Geotech. Engrg. Div., ASCE, 109(5), 699–716.
11.
Dennis, J. E., and Schnabel, R. B. (1983). “Numerical methods for unconstrained optimization.”Series in computational mathematics, Prentice-Hall, Englewood Cliffs, N.J.
12.
Gibson, R. E., England, G. L., and Hussey, M. H. L.(1967). “The theory of one-dimensional consolidation of saturated clays, I. finite nonlinear consolidation of thin homogeneous layers.”Géotechnique, London, U.K., 17(3), 261–273.
13.
Huerta, A., Kriegsmann, G. A., and Krizek, R. J.(1988). “Permeability and compressibility of slurries from seepage-induced consolidation.”J. Geotech. Engrg., ASCE, 114(5), 614–627.
14.
Imai, G.(1979). “Development of a new consolidation test procedure using seepage force.”Soils and Found., Tokyo, Japan, 19(3), 45–60.
15.
Liu, J. C. (1990). “Determination of soft soil characteristics,” PhD dissertation, Dept. of Civ. Engrg., Univ. of Colorado, Boulder, Colo.
16.
Liu, J. C., and Znidarčić, D.(1991). “Modelling one-dimensional compression characteristics of soils.”J. Geotech. Engrg., ASCE, 117(1), 162–169.
17.
McVay, M., Townsend, F., and Bloomquist, D.(1986). “Quiescent consolidation of phosphatic waste clays.”J. Geotech. Engrg., ASCE, 112(11), 1033–1049.
18.
Sills, G. C., Hoare, S. D. L., and Baker, N. (1984). “An experimental assessment of the restricted flow consolidation test.”Oxford Univ. Engrg. Rep. SM052/84, Oxford Univ., Oxford, U.K.
19.
Somogyi, F. (1979). “Analysis and prediction of phosphatic clay consolidation: implementation package.”Tech. Rep., Florida Phosphatic Clay Res. Proj., Lakeland, Fla.
20.
You, Z. (1993). “Flow channeling in soft clay and its influence on consolidation,” PhD dissertation, Dept. of Civ. Engrg., Univ. of Colorado, Boulder, Colo.
21.
Znidarčić, D. (1982). “Laboratory determination of consolidation properties of cohesive soils,” PhD dissertation, Dept. of Civ. Engrg., Univ of Colorado, Boulder, Colo.
22.
Znidarčić, D., Schiffman, R. L., Pane, V., Croce, P., Ko, H. Y., and Olsen, H. W.(1986). “The theory of one-dimensional consolidation of saturated clays: V, constant rate of deformation testing and analysis.”Géotechnique, London, U.K., 36(2), 227–237.
23.
Znidarčić, D., and Liu, J. C. (1989). “Consolidation characteristics determination for dredged materials.”Proc., 22nd Annu. Dredging Seminar, Ctr. for Dredging Studies, Texas A&M Univ., College Station, Tex., 45–65.
24.
Znidarčić, D., Abu-Hejleh, A. N., Fairbanks, T., and Robertson, A. (1992). “Seepage induced consolidation test, equipment description and user's manual.”Rep. Prepared for FIPR, Dept. of Civ. Engrg., Univ. of Colorado, Boulder, Colo.
Information & Authors
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Published In
Journal of Geotechnical Engineering
Volume 122 • Issue 4 • April 1996
Pages: 295 - 301
Copyright
Copyright © 1996 American Society of Civil Engineers.
History
Published online: Apr 1, 1996
Published in print: Apr 1996
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