Influence of matric suction on shear strength behavior of a residual clayey soil
Tóm tắt
In this paper, the shear strength with respect to the matric suction of unsaturated soils was studied. For this purpose, unsaturated triaxial testing procedures were applied to the undisturbed residual soil specimens. An apparatus for performing triaxial tests was designed and constructed. In the tests, matric suction was controlled by using the axis translation technique, and pore water volume changes were measured by means of a volume change transducer with 10−8 m3 sensitivity. The test results indicated that the matric suction contributes to the shear strength of unsaturated soil specimens, and this contribution called suction strength varies non-linearly with respect to the matric suction. The logarithmic model needing to know the air-entry value and the internal friction angle of a soil specimen for prediction of the suction strength were presented and compared with the test results. It was found that suction strength values predicted from the proposed model were in satisfactory agreement with the experimental results.
Tài liệu tham khảo
Alonso EE, Gens A, Josa AA (1990) A constitutive model for partially saturated soils. Géotechnique 40(3):405–430
Aversa S, Nicotera MV (2002) A triaxial and odometer apparatus for testing unsaturated soils. Geotechn Test J 25(1):3–15
Bishop AW (1959) The principle of effective stress. Tecknish Ukebland 106(39):859–863
Bishop AW, Blight GE (1963) Some aspects of effective stress in saturated and partly saturated soils. Géotechnique 13(3):177–197
Coleman JD (1962) Stress–strain relations for partially saturated soils. Géotechnique 12(4):348–350
Drumright EE, Nelson JD (1995) The shear strength of unsaturated tailings sand. In: Alonso EE, Delage P (eds) The 1st international conference on unsaturated soils, Paris, 1995, A.A. Balkema, Rotterdam, pp 45–50
Dunn CS (1965) Developments in the design of triaxial equipment for testing compacted soils. Proceedings of the symposium on economic use of soil testing in site investigation held in Birmingham, Alabama, vol 3, pp 9–25
Escario V, Juca J (1989) Strength and deformation of partly saturated soils. Proceedings of the 12th international conference on soil mechanics and foundation engineering, Rio De Janeiro, vol 11, pp 43–46
Escario V, Saez J (1986) The strength of partly saturated soils. Géotechnique 36(3):453–456
Fredlund DG, Morgenstern NR, Widger RA (1978) The shear strength of unsaturated soil. Can Geotechn J 15:313–321
Fredlund DG, Rahardjo H (1993) Soil mechanics for unsaturated soils. Wiley, New York
Fredlund DG, Xing A, Fredlund MD, Barbour SL (1996) The relationship of the unsaturated soil shear strength to the soil–water characteristic curve. Can Geotechn J 32:440–448
Gan JKM, Rahardjo H, Fredlund DG (1988) Determination of the shear strength parameters of an unsaturated soil using the direct shear test. Can Geotechn J 25:500–510
Gan JKM, Fredlund DG (1996) Shear strength characteristics of two saprolitic soils. Can Geotechn J 33:595–609
Gulhati SK, Satija BS (1981) Shear strength of partially saturated soils. Tenth international conference on soil mechanics and foundation engineering. Stockholm Sweden l(1):609–612
Ho DYF, Fredlund DG (1982) Multi-stage triaxial tests for unsaturated soils. Geotechn Test J ASTM 5:18–25
Khalili N, Khabbaz MH (1998) A unique relationship for χ for the determination of the shear strength of unsaturated soils. Géotechnique 48(5):681–687
Lamborn MJ (1986) A micromechanical approach to modelling partly saturated soils, M.Sc. Thesis. Texas A&M University, Texas
Miao L, Liu S, Lai Y (2002) Research of soil–water characteristics and shear strength features of Nanyang expansive soil. Engineering Geology, Elsevier Science 65:261–267
Oberg AL, Sallfors G (1997) Determination of shear strength parameters of unsaturated silt and sands based on the water retention curve. Geotechn Test J 20(1):40–48
Oloo SY, Fredlund DG (1996) A method for determination of φb for statically compacted soils. Can Geotechn J 33:272–280
Rassam DW, Williams DJ (1997) Shear strength of unsaturated gold tailings. Proceedings of the first Australia New Zealand conference on environmental geotechnics, Balkema, Rotterman, pp 469–474
Rassam DW, Cook F (2002) Predicting the shear strength envelope of unsaturated soils. Geotechn Test J 25(2):215–220
Rohm SA, Vilar OM (1995) Shear strength of unsaturated sandy soil. In: Alonso EE, Delage P (eds) A.A. Balkema, Rotterdam, Paris, pp 189–195
Satija BS (1978) Shear behavior of partly saturated soils, Ph.D. thesis. Indian Instute of Technology, New Delhi
Shen Z, Yu S (1996) The problems in the present studies on mechanics for unsaturated soils. Proceedings of the symposium on geotechnical aspects of regional soils, China (in Chinese)
Toll DG, Ong BH (2003) Critical-state parameters for an unsaturated residual sandy clay. Géotechnique 53(1):93–103
Vanapalli SK, Fredlund DG, Pufahl DE, Clifton AW (1996) Model for the prediction of shear strength with respect to soil suction. Can Geotechn J 33:379–392
Wong JC, Rahardjo H, Toll DG, Leong EC (2001) Modified triaxial apparatus for shearing-infiltration test. Geotechn Test J 24(4):370–380
Wulfsohn D, Adams BA, Fredlund DG (1998) Triaxial testing of unsaturated agricultural soils. J Agric Eng Res 69:317–330
Xu YF (2004) Fractal approach to unsaturated shear strength. J Geotechn Geoenviron Eng 130(3):264–273