Determination of permeability coefficient of saturated clay based on linear segment of settlement curve

• Autorzy: Sawicki E. , Stróżyk J.
• Języki publikacji: EN

Abstrakty

EN

In this article, the conception of determination of permeability coefficient k based on linear segment of the settlement curve in a compression test is presented. By observing the evolution of the settlement curve of a soil, it is possible to find in its initial part a linear relation between the settlement and time. For clays, the time interval ranges from about 45 sec to a few minutes, as measured from the moment a load has been imposed. The linear character of the graph means that rheological effects are absent and that settlement velocity is constant and equal to percolation velocity. Thus, it may be supposed that within this time interval the permeability coefficient is approximately constant, too. Hence, the value of k calculated on the basis of this linear part of the settlement curve should be reliable. In this paper, the values of permeability coefficient k for clay, obtained in triaxial apparatus were compared with those obtained in oedometer test (based on the linear segment of the settlement curve). The results obtained appear to be promising. Nevertheless, since the number of tests carried out so far is rather small, it is necessary to perform more experiments to verify our conception.

Słowa kluczowe

PL

współczynnik filtracji; przepuszczalność gruntów; gliny

• Wydawca: De Gruyter
• Czasopismo: Studia Geotechnica et Mechanica
• Rocznik: 2009
• Tom: Vol. 31, nr 4
• Strony: 73--84
• Opis fizyczny: bibliogr. 17 poz.

Twórcy

autor

Sawicki E.

autor

Stróżyk J.

• Institute of Geotechnics and Hydrotechnics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław

Bibliografia

• [1] ACHARI G., JOSHI R.C., BRNTLEY L.R., CHATTERJI S., Prediction of the hydraulic conductivity of clays using the electric double layer theory, Can. Geotech. J., Vol. 36(5), 1999, 783–792.
• [2] ANANDARAJAH A., Mechanism Controlling Permeability Change in Clays due to Changes in Pore Fluid, Journal of Geotechnical and Geoenvironmental Engineering, Vol. 129, No. 2, 2003, 163–172.
• [3] CHOMA-MORYL K., Zmienność własności fizycznych iłów poznańskich okolic Wrocławia na tle ich genezy i litostratygrafii, Geol. Sud., Vol. 23, No. 1, 1988, 1–57.
• [4] DIXON D.A., GRAHAM J., GRAY M.N., Hydraulic conductivity of clays in confined tests under low hydraulic gradients, Can. Geotech. J., Vol. 36(5), 1999, 815–825.
• [5] FREDLUND D.G., RAHARDJO H., Soil Mechanics for Unsaturated Soils, New York: John Wiley&Sons, Inc., 1993.
• [6] HIRD C.C., SRISAKTHIVEL S., Laboratory investigation of permeability measurement in clay using outflow from unsupported cavities, Geotechnique, Vol.55, No. 5, 2005, 393–402.
• [7] HEAD K.H., Manual of soil laboratory testing, London: Pentech Press, Vol. 1–3, London, 1992.
• [8] JAROMIŃSKA M., DEMBICKI E., Określenie współczynnika filtracji gruntów słabo przepuszczalnych, Inżynieria Morska i Geotechnika, nr 5, 1999.
• [9] LEROUEIL S., Compressibility of clays: Fundamental and practical aspects, J. Geotech. Eng., ASCE, 6, 1996.
• [10] NAJJAR Y.M., BASHEER I.A., Utilizing computational neural networks for evaluating the permeability of compacted clay liners, Geotechnical and Geological Engineering, Vol. 14, 1996, 193–212.
• [11] SIEMENS G., BLATZ J.A., Development of a hydraulic conductivity apparatus for bentonite soils, Can. Geotech. J., Vol. 44, 2007, 997–1005.
• [12] STRZELECKI T., KOSTECKI S., ŻAK S., Modelowanie przepływów przez ośrodki porowate, Dolnośląskie Wydawnictwo Edukacyjne, Wrocław, 2008.
• [13] TAVENAS F., LEBLOND P., JEAN P., LEROUEIL S., The permeability of natural soft clays. Part I: Methods of laboratory measurement, Can. Geotech. J., Vol. 20, No. 4, 1983, 629–644.
• [14] TAVENAS F., LEBLOND P., JEAN P., LEROUEIL S., The permeability of natural soft clays. Part II: Permeability characteristics, Can. Geotech. J., Vol. 20, No. 4, 1983, 645–660.
• [15]WYSOKIŃSKI L., ŁUKASIK S., Badania szczelności izolacji mineralnych składowisk odpadów; Instrukcja 339/96, Ministerstwo Gospodarki Przestrzennej i Budownictwa, Instytut Techniki Budowlanej, Warszawa, 1996
• [16] ZHIKHOVICH V.V., Determination of the permeability coefficient of saturated clay from the settlement curve in a compression test, translated from Gidrotekhnicheskoe Stroitel'stvo, No. 12, pp. 36–37, December 1981; Plenum Publishing Corporation, 1982.
• [17] DIN 18130-1:1998. Baugrund, Untersuchung von Bodenproben. Bestimmung des Wasserdurchlassugkeitsbeiwerts