Hidrológiai Közlöny 2012 (92. évfolyam)
3. szám - Imre Emőke–Laufer Imre–Sheng, Daichao: A telítetlen talajok egyes talajmechanikai anyagmodelljei
TMRin^i^ntsíú^^elítetler^^ 71 ahol s a e a levegő belépési szívás, és s K a reziduális víztartalomhoz tartozó szívás. A víztartási görbe hiszterézise általában nagyobb jelentőségű annál, hogy el lehetne hanyagolni. Emiatt ezt a görbét ki kell egészíteni egy nedvesedési ággal, amit a s w e víz belépési érték, valamint az előzőekben leírt _Z WS meredekség jellemez (lásd B-l. ábra). Az S, fő száradási (deszorpciós) és nedvesedési (adszorpciós) ágai közötti visszafordítható átmenetek leírására egy meredekségü, párhuzamos vonalsereg szolgál. Ebben a tanulmányban a fő ágak meredekségét a száradási ág levegő belépési és reziduális víztartalomhoz tartozó szívások közötti szakaszának a meredekségével egyezőnek tekintjük. A nedvesedési ág víz belépési érték feletti szakaszát is meredekségünek tételezzük fel (lásd B-l. ábra). Az itt alkalmazott egyszerűsítések hasonlóak a Wheeler et al. (2003) modellhez. Ebben az egyszerűsített modellben a teljes telítettséghez tartozó legnagyobb szívás érték a telítési szívás (s s a), és nem a levegő belépési szívás (s a e). Irodalom Al-Badran Y & Schanz T. 2009. Yielding surface model of volume change characteristics for unsaturated fine grained soils. In: Unsaturated Soils - Theoretical & Numerical Advances in Unsaturated Soil Mechanics (Buzzi O, Fityus SG & Sheng D, eds), CRC Press, pp. 863-871. Alonso EE, Gens A & Josa A. 1990. A constitutive model for partially saturated soils. Géotechnique, 40: 405-430. Alonso EE, Vaunat J & Gens A. 1999. Modelling the mechanical behaviour of expansive clays. Engng Geol., 54: 173-183. Arson C and Gatmiri B. 2008. On damage modelling in unsaturated clay rocks. Physics Chemistry Earth, 33: 635-640. Baker R & Frydman S. 2009. Unsaturated soil mechanics: Critical review of physical foundations. Engng Geol., 106: 26-39 Bian H & Shahrour 1. 2009. 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Bounding surface plasticity. I: mathematical foundation and hypoelasticity. ASCE J. Engng Mechanics, 112: 966-987. Dangla P, Malinsky L & Coussy O. 1997. Plasticity and imbibition-drainge curves for unsaturated soils: a unified approach. In: Numerical Models in Geomechanics (NUMOG VI, Pietruszczak S & Pande GN, eds), Balkema Rotterdam, pp. 141-146. Delage P & Graham J. 1996. Understanding the behaviour of unsaturated soils requires reliable conceptual models: state of the art report. In: Unsaturated Soils (Alonso EE & Delage P, eds), Balkema, Rotterdam, vol. 3, pp. 1223-1256. D'Onza F, Gallipoli D & Wheeler SJ. 2010. Effect of anisotropy on the prediction of unsaturated soil response under triaxial and oedometric conditions. Proc. 5th Int. Conf. Unsaturated Soils. Taylor & Francis (In pr). Fityus SG & Buzzi O. 2009. The place of expansive clays in the framework of unsaturated soil mechanics. Appl. Clay Science, 42: 150-155. Fredlund DG, Morgenstern NR & Widger A. 1978. Shear strength of unsaturated soils. Canadian Geotechnical Journal, 15: 313-321. Fredlund DG & Rahardjo H 1993, Soil Mechanics for Unsaturated Soils, John Wiley & Sons, New York. Fredlund DG, Xing A, Fredlund MD & Barbour SL. 1996. Relationship of the unsaturated soil shear strength to the soil-water characteristic curve. Canadian Geotechnical Journal, 33: 440-448. Fredlund DG & Xing A. 1994. Equations for the soil-water characteristic curve. Canadian Geotechnical Journal, 31: 521-532. Gallipoli D, Gens A, Chen G & D'Onza F. 2008. Modelling unsaturated soil behaviour during normal consolidation and at critical state. Computers & Geotechnics, 35: 825-834. Gallipoli D, Gens A, Sharma R & Vaunat J. 2003a. An elastoplastic model for unsaturated soil incorporating the effects of suction and degree of saturation on mechanical behaviour. Géotechnique, 53: 123-135. Gallipoli D, Wheeler SJ & Karstunen M. 2003b. Modelling of variation of degree of saturation in a deformable unsaturated soil. Géotechnique, 53: 105-112. Gens A. 1996. Constitutive modelling: Application to compacted soils. In: Unsaturated Soils (Alonso EE & Delage P, eds), Balkema, Rotterdam, vol. 3, pp. 1179-1200. Gens A. 2009. Some issues in constitutive modelling of unsaturated soils. In: Unsaturated Soils - Theoretical & Numerical Advances in Unsaturated Soil Mechanics (Buzzi O, Fityus SG & Sheng D, eds), CRC Press, pp. 613-626. Gens A. 2010. Soil-environmental interactions in geotechnical engineering. Géotechnique, 60: 3-74. Gens A & Alonso EE. 1992. A framework for the behaviour of unsaturated expansive clays. Canadian Geotechnical Journal, 29: 1013-1032 Gens A, Sánchez M & Sheng D. 2006. On constitutive modelling of unsaturated soils'. Acta Geotechnica, 1: 137-147. Gens A, Guimar?s L do N, Sánchez M & Sheng D. 2008. Developments in modelling the generalised behaviour of unsaturated soils. 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Houston SL. 2002. Applied Unsaturated Soil Mechanics, State of the Art Report, In: Unsaturated Soils (Juca JFT, de Campos TMP, Marinho FAM, eds), Balkema, Lisse, Vol. 3, pp. 1127 - 1134. Hoyos LR, Arduino P. 2008. Implicit algorithms in modeling unsaturated soil response in three-invariant stress space. Int. J. Geomechanics. 8: 266-273. Hutter K, Laloui L & Vulliet L. 1999. Thermodynamically based mixture models for saturated and unsaturated soils. Mechanics of Cohesive Frictional Materials, 4: 295-338. Imre, E.; Czap, Z.; Telekes, G. (1999). Stress state variables for unsaturated soils. Hidrológiai Közlöny 4:197-202. Imre, E.; Czap, Z.; Telekes, G. (2002) A telítetlen talajok fizikai egyenletei. Hidrológiai Közlöny 5:257-262 Imre, E. (2009). Az árvízvédelmi gátak telítetlen talajának egyes vízáramlási modelljei. Hidrológiai Közlöny. 2009 (3) 38-42. Imre, E. (2008) Telítetlen talajmechanika. Elektronikus formában közzétett egyetemi jegyzet.
