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The elastic undrained modulus Eu50 for stiff consolidated clays related to the concept of stress history and normalized soil properties

Treść / Zawartość
Identyfikatory
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The paper presents the results of a triaxial test conducted on stiff, consolidated clays. The standard TXCIU procedure (isotropic consolidation and undrained shearing) was applied in the laboratory soil tests. The undrained elastic modulus Eu50 was de- termined from each test. The Eu50 values were determined for soil samples cut out from different depths and tested under different confining pressures. There was a significant scatter of values with depth, and no relationships between Eu50 modules or other geotechnical parameters (e.g., cu) were observed. This work presents the concept of normalization of Eu50 modulus values using modified normalization SHANSEP (Stress History And Normalized Soil Engineering Properties). This method was first proposed for estimating the value of the undrained shear strength cu normalizing the parameter relative to the in situ effective vertical stress σ vo and loading history (overconsolidation stress σ p and overconsolidation ratio OCR) of the soil. The study demonstrated that the concept of normalization of soil properties can also be used for testing elastic modulus Eu50 of con- solidated natural clays and normalized values of geotechnical parameters taking into account the state of stress and load history can be correlated with the value of the overburden pressure.
Wydawca
Rocznik
Strony
67--72
Opis fizyczny
Bibliogr. 21 poz., tab., rys.
Twórcy
autor
  • Wrocław University of Science and Technology, Faculty of Civil Engineering, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław.
  • Wrocław University of Science and Technology, Faculty of Civil Engineering, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław.
Bibliografia
  • [1] ATKINSON J., The mechanics of soils and foundations, CRC Press, 2007.
  • [2] ABDULHADI N.O., GERMAINE J.T., WHITTLE A.J., Stress- dependent behavior of saturated clay, Canadian Geotechnical Journal, 2012, 49(8), 907–916.
  • [3] BJERRUM L., Problems of soil mechanics and construction on soft clays, State of the art report, Session 4, Proc. VIII ICSMFE, Mos- cow, 1973, Vol. 3.
  • [4] BURLAND J.B., On the compressibility and shear strength of natural clays, Géotechnique, 1990, 40(3), 329–378.
  • [5] HEAD K.H., Manual of soil laboratory testing, Pentech Press, (Vol. 3), London 1986.
  • [6] HOULSBY G.T., WROTH C.P., The variation of shear modulus of a clay with pressure and overconsolidation ratio, Soils and Foundations, 1991, 31(3), 138–143.
  • [7] JAMIOLKOWSKI M. et al., New developments in field and laboratory testing of soils, Proc. 9th Int. Conf. Soil Mech., San Francisco, 1985, 1, 57–153.
  • [8] JARDINE R.J., SYMES M.J., BURLAND J.B., The measurement of soil stiffness in the triaxial apparatus, Géotechnique, 1984, 34(3), 323–340.
  • [9] LADD C.C., FOOTT R., New design procedure for stability of soft clays, Journal of the Geotechnical Engineering Division, 1974, 100(7), 763–786.
  • [10] LIPIŃSKI M., WDOWSKA M., A stress history and dependent stiffness of over consolidated cohesive soil, Ann. Warsaw Univ. of Life Sci. – SGGW, Land Reclam., 2011, 43(2), 207–216.
  • [11] LUNNE T., BERRE T., ANDERSEN K.H., STRANDVIK S., SJURSEN H., Effects of sample disturbance and consolidation procedures on measured shear strength of soft marine Norwegian clays, Can. Geotechnical J., 2006, 43, 726–750.
  • [12] ROSCOE K., BURLAND J.B., On the generalized stress-strain behaviour of wet clay, Cambridge University Press, 1968, 535–609.
  • [13] SANTAGATA M., GERMAINE J.T., LADD C.C., Factors affecting the initial stiffness of cohesive soils. Journal of Geotechnical and Geoenvironmental Engineering, 2005, 131(4), 430–441.
  • [14] SANTAGATA M., GERMAINE J.T., LADD C.C., Small-strain non- linearity of normally consolidated clay, Journal of Geotechnical and Geoenvironmental Engineering, 2007, 133(1), 72–82.
  • [15] SHEAHAN T.C., LADD C.C., GERMAINE J.T., Rate-dependent undrained shear behavior of saturated clay, Journal of Geo- technical Engineering, 1996, 122(2), 99–108.
  • [16] STRÓŻYK J., The Over consolidation Ratio of the Poznan Clays from the Area of SW Poland, Proc. Earth and Planetary Science, 2015, (15), 293–298
  • [17] STRÓŻYK J., TANKIEWICZ M., The Undrained Shear Strength of Over consolidated Clays, Procedia Engineering, 2014, 91, 317–321.
  • [18] WHITTLE A.J., KAVVADAS M.J., Formulation of MIT-E3 constitutive model for over consolidated clays, Journal of Geotechnical Engineering, 1994, 120(1), 173–198.
  • [19] WRIGHT P.J., Validation of soil parameters for deep tube tunnel assessment, Proceedings of the ICE-Geotechnical Engineering, 2012, 166(1), 18–30.
  • [20] PN-EN ISO 14688:2006. Geotechnical investigation and testing. Identification and classification of soil.
  • [21] PKN-CEN ISO/TS 17892:2009. Geotechnical investigation and testing. Laboratory testing of soil.
Uwagi
PL
Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-4f155701-7b02-4cc8-bb1e-8877545c3267
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