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,=@} QkD pO=aD |x_Lr QO l =N |=yxvwtv u}}=B w q=@ |}xQiL ?; Q=Wi Q=Okt 'pmWp=mU=B wr}m 230 Q@=Q@ l =N |xvwtv x}rw= |Di=@ Vmt \UwDt Q=Okt w u=Um}

"CU=|}=H@=H VwQ R= xO=iDU= =@ l =N |=yxvwtv 'x}rw=|Di=@Vmt |Q}oxR=Ov= R= Oa@u=tR xm Ov=xOW xO}v=UQ p=mU=B wr}m 100 |Di=@ Vmt Q=Okt x@ uOQmQD w |QwLtpw] x@ Ca=U 20 |r= 15 u}@ l =N |xvwtv `=iDQ= x@ xDU@ pO=aD x@ uO}UQuwQO p=mU=B wr}m 40 Oy hqDN= =@ |@; u=} QH TBU "�9 w 8 |=ypmW� O}t=Hv=Q=Wi w C@=F l =N |}xQiL |=wy Q=Wi Q=Okt Qt= u}= |=Q@ "OW Q=QkQ@ l =N |xvwtvxO=O V}=Ri= w Vy=m p=mU=B wr}m 20 ?}DQDx@ l =N |xvwtv u}}=B w q=@ |}xQiL ?;u}= "CU= xOW l =N |=yxvwtv |Di=@ Vmt \UwDt Q=Okt uOv=tC@=F Ea=@ xm OWj@=]t [12w2]"CU= xDiQo Q=Qk xO=iDU= OQwt xOWs=Hv= C=k}kLD |NQ@ QO R}v VwQ|=yxvwtv |HwQN w |OwQw ?; u=} QH |}x_Lr |@O u=tR CWPo =@ '10 pmW`=iDQ= x@ u=tR u}= xm Ovm|t =O}B p}=tD sy x@ l}ORv w C@=F Q=Okt l} x@ l =Nx@ |HwQN w |OwQw ?; u=} QH |@O uO}UQ R= Oa@ "CU= xDU@=w l =N |xvwtvQ}F-=D =D OW xO=O V}=Ri= p=mU=B wr}m 80 Q=Okt x@ u=} QH Oy hqDN= 'pO=aD Cr=L

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|Di=@ Vmt |Q}oxR=Ov= QO l =N |=yxvwtv |}xQiL ?; Q=Wi C=Q}}eD "7 pmW"x}rw=

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19

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u=} QH Oy QO =yV}=tR; u}= "CU= xOW |Q}oxR=Ov= p=mU=B wr}m 200 w 100Vmt x@ l =N |=yxvwtv uO}v=UQ =@ Qt= u}= |=Q@ "Ov=xOW s=Hv= p=mU=B wr}m 40p=mU=B wr}m 200 w 100 |x@v=Hxty |t}mLD |=yVvD 'p=mU=B wr}m 100 |Di=@|=wy w ?; |=yR=i x@ 'xrLQt u}= pw] QO "CU= xOW OQ=w l =N |=yxvwtv Q@|Q}oxR=Ov= =@ R}v l =N |xvwtv pm sHL Q}}eD w xOW xO=O |WmyR |xR=H= |}xQiLs=tD= =@ "CU= xOW |Q}oxR=Ov= x=oDUO pwrU uwQO x@ |HwQN/|OwQw ?; u=} QHp=mU=B wr}m 40 Oy hqDN= x@ |@; u=} QH '�Ca=U 24 ,qwtat� s}mLD |xrLQtpO=aD Cr=L x@ |}x_Lr u=} QH |@O uO}UQ =D w xOW O=H}= l =N |=yxvwtv uwQO|=yVvD |=Q@ |}x_Lr u=} QH |@O C=Q}}eD '12 pmW QO "CU= xOW xO=O xt=O=hr=10 |=ypmW |xU}=kt =@ "CU= xOW s}UQD p=mU=B wr}m 200 w 100 |t}mLD|t}mLD |=yVvD V}=Ri= =@ u=} QH pO=aD |Q=QkQ@ u=tR xm OwW|t xOy=Wt 12 w

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?; |Q}PBPwiv ?} Q[ |x@U=Lt|=yVwQ x@ u=wD|t =Q `=@W=Q}e l =N |Q}PBPwiv ?} Q[ |Q}oxR=Ov= |=yVwQ"OQm s}UkD �|v}tND |=yVwQ R= xO=iDU= =@� s}kDUtQ}e w �|y=oW}=tR;� s}kDUtx@ u=wD|t R}v =Q l =N uwQO ?; |Q}PBPwiv ?} Q[ s}kDUt |Q}oxR=Ov= |=yVwQ[5]"OQm |Ov@xk@] �u=tR x@ xDU@=w� Q=O}=B=v =} w �u=tR R= pkDUt� Q=O}=B |xDUO wOuwQO ?; |Q}PBPwiv ?} Q[ |Q}oxR=Ov= |=Q@ Q=O}=B s}kDUt VwQ R= 'xar=]t u}= QOu}L QO |Di=@ Vmt w u=} QH Oy Q}O=kt Cr=L u}= QO "CU= xOW xO=iDU= l =N|OwQw u=} QH uOWl}ORv =@ Q=O}=B Cr=L \}=QW w Ov=C@=F |Di=@ Vmt |Q}oxR=Ov=

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[19w17'1]%�1 |x]@=Q� CU= Q=QkQ@ R}v `=@W=Q}ev = ki (1)

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20

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22

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�References� `@=vt1. Fredlund, D.G. and Rahardjo, H., Soil Mechanics for

Unsaturated Soils, John Wiley & Sons Inc, New York(1993).

2. Huang, S.; Fredlund, D.G. and Barbour, S.L. \Measure-ment of the coe�cient of permeability for a deformableunsaturated soil using a triaxial permeameter", Cana-dian Geotechnical Journal, 35, pp. 426-432 (1998).

3. Lobbezoo, J.P. and Vanapalli, S.K., A Simple Techniquefor Estimating the Coe�cient of Permeability of Unsat-urated Soils, Genie. Uottawa. Ca, Sai-JohnG (2002).

4. Gao, L.; Luan, M. and Yang, Q. \Experimental study onpermeability of unsaturated remolded clay", EJGE, 13,Bund. D., (2008).

5. Benson, C.H. and Gribb, M.M. \Measuring unsatu-rated hydraulic conductivity in the laboratory and �eld",Unsaturated Soil Engineering Practice, ASCE Geotech.Spec. Pub., 68, ASCE New York, N.Y, pp. 113-168(1997).

6. Ng, C.W.W. and Menzies, B., Advanced Unsaturated SoilMechanics and Engineering, Taylor & Francis, Londonand New York (2007).

7. Klute, A. \Laboratory measurement of hydraulic con-ductivity of unsaturated soils", In Method of Soil Anal-ysis, Edited by C.A. Black, D.D. Evans, J.L. White,L.E. Esminger, and F.E. Clark. American Society ofAgronomy, Monograph 9, Madison, Wis., 1, pp. 253-261(1965).

8. Barden, L. and Pavlakis, G. \Air and water permeabilityof compacted unsaturated cohesive soils", Journal of SoilScience, 22(3), pp. 302-318 (1971).

9. Fleureau, J.M. and Taibi, S. \A new apparatus for themeasurement of polyphasic permeabilities", In Proceed-ings of the 1st International Conference on Environmen-tal Geotechnics (ICEG), Edmonton, Alta., 11{14 July,Edited by the Technical Program Committee of the 1stICEG, BiTech Publishers, Richmond, B.C., 1, pp. 227-232 (1994).

10. Dane, J.H.; Hofstee, C. and Corey, A.T. \Simultane-ous measurement of capillary pressure, saturation ande�ective permeability of immiscible liquids in porous me-dia", Water Resources Research, 34(12), pp. 3687-3692(1998).

11. Gan, J.K.M. and Fredlund, D.G. \A new laboratorymethod for the measurement of unsaturated coe�cientsof permeability of soils", In Unsaturated soils for Asia,Edited by H. Rahardjo, D. Toll, and E.C. Leong, A.A.Balkema, Rotterdam, pp. 381-386 (2000).

12. Samingan, A.S.; Leong, E.C. and Rahardjo, H. \A exi-ble wall permeameter for measurements of water and air

coe�cients of permeability of residual soils", CanadianGeotechnical Journal, 40, pp. 559-574 (2003).

13. Siemens, G. and Baltz, J.A. \Development of a hy-draulic conductivity apparatus for bentonite soils", Can.Geotech. Journal, 44(8), pp. 997-1005 (2007).

14. Maqsoud, A.; Bussi�ere, B.; Mbonimpa, M. and Aubertin,M. \Hysteresis e�ects on the water retention curve: Aresults and predictive models", 57th Canadian Geotech-nical Conference, Quebec, Session 3A, pp. 8-15 (2004).

15. Huat, Bujang B.K.; Ali, Faisal H.J. and Abdullah, A.\Field and laboratory suction- soil moisture relationshipof unsaturated residual soils", American Journal of En-vironmental Sciences, 1(1), pp. 34-40 (2005).

16. Lamara, M. and Derriche, Z. \Prediction of unsaturatedhydraulic properties of dune sand on drying and wettingpaths", EJGE, 13, Bund. B., (2008).

17. Childs, E.C. and Collis-George, N. \The permeability ofporous materials", Proc. Royal Soc., 201A, pp. 392-405(1950).

18. Mirzaii. A. and Yasrobi, S.S. \Soil-water retention be-haviour of an unsaturated kaolin-sand Mixture", 8th In-ternational Congress on Civil Engineering, Shiraz Uni-versity, Shiraz, Iran (2009).

19. Richards, L.A. \Capillary conduction of liquids throughporous mediums", Physics, NY, 1, pp. 318-333 (1931).

20. Hansbo, S. \Consolidation of clay, with special referencetoin uence of vertical drains", Proceedings of the SwedishGeotechnical Institute, 18, Linkoping (1960).

21. Burdine, N.T., Relative Permeability Calculations fromPore-size Distribution Data, Trans. AIME (1952).

22. Brooks, R.H. and Corey, A.T. \Hydraulic properties ofporous media", Colorado State Univ. Hydrol. Paper, 3,pp. 27 (1964).

23. Kozeny, J. \Uber kapillare Leitung des Wassers im Bo-den", Akademie der Wissesschaften, Wien, 136(2a), pp.271 (1927).

24. Carmen, P.C., Flow of Gases Through Porous Media,Butterworths, London (1956).

25. Romero, E. and Vaunat, J. \Retention curves in de-formable clays", InExperimentalevidence and Theoreti-cal Approaches in Unsaturated Soils, eds A. Tarantinoand C. Mancuso, pp. 91- 106. Rotterdam: A.A. Balkema(2000).

26. Karube, D. and Kawai, K. \The role of pore water inthe mechanical behaviour of unsaturated soils", Geotech.Geolog. Engineering, 19(3-4), pp. 211-241 (2001).

27. Gallipoli, D.; Wheeler, S.J. and Karstunen, M. \Mod-elling the variation of degree of saturation in a de-formable unsaturated soil", Ge'otechnique, 53(1), pp.105-112 (2003).

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