DOI QR코드

DOI QR Code

An elastoplastic model for structured clays

  • Chen, Bo (College of Civil Engineering and Architecture, Quzhou University) ;
  • Xu, Qiang (State Key Laboratory of Geohazard Prevention and Geoenvironmental Protection, Chengdu University of Technology) ;
  • Sun, De'an (State Key Laboratory of Geohazard Prevention and Geoenvironmental Protection, Chengdu University of Technology)
  • 투고 : 2013.10.17
  • 심사 : 2014.05.05
  • 발행 : 2014.08.25

초록

An elastoplastic model for structured clays, which is formulated based on the fact that the difference in mechanical behavior of structured and reconstituted clays is caused by the change of fabric in the post-yield deformation range, is present in this paper. This model is developed from an elastoplastic model for overconsolidated reconstituted clays, by considering that the variation in the yield surface of structured clays is similar to that of overconsolidated reconstituted clays. However, in order to describe the mechanical behavior of structured clays with precision, the model takes the bonding and parabolic strength envelope into consideration. Compared with the Cam-clay model, only two new parameters are required in the model for structured clays, which can be determined from isotropic compression and triaxial shear tests at different confining pressures. The comparison of model predictions and results of drained and undrained triaxial shear tests on four different marine clays shows that the model can capture reasonable well the strength and deformation characteristics of structured clays, including negative and positive dilatancy, strain-hardening and softening during shearing.

키워드

참고문헌

  1. Anagnostopoulos, C.A. and Grammatikopoulos, I.N. (2011), "A new model for the prediction of secondary compression index of soft compressible soils", Bull. Eng. Geol. Environ., 70(3), 423-427. https://doi.org/10.1007/s10064-010-0323-x
  2. Asaoka, A., Nakano, M. and Noda, T. (2000), "Superloading yield surface concept for highly structured soil behavior", Soil. Found., 40(2), 99-110.
  3. Baudet, B. (2001), "Modelling effects of structure in soft natural clays", Ph.D. Dissertation, City University, London, UK.
  4. Baudet, B. and Stallebrass. S. (2004), "A constitutive model for structured clays", Geotechnique, 54(4), 269-278. https://doi.org/10.1680/geot.2004.54.4.269
  5. Burland, J.B. (1990), "On the compressibility and shear strength of natural clay", Geotechnique, 40(3), 329-378. https://doi.org/10.1680/geot.1990.40.3.329
  6. Burland, J.B., Rampello, S., Georgiannou, V.N. and Calabresi, G. (1996), "A laboratory study of the strength of four stiff clays", Geotechnique, 46(3), 491-514. https://doi.org/10.1680/geot.1996.46.3.491
  7. Callisto, L. and Rampello, S. (2004), "An interpretation of structural degradation for three natural clays", Can. Geotech. J., 41(3), 392-407. https://doi.org/10.1139/t03-099
  8. Casagrande, A. (1936), "The determination of the preconsolidation load and its practical significance", Proceedings of 1st International Conference on Soil Mechanics and Foundation Engineering, Boston, MA, USA.
  9. Chen, B. (2012), "Mechanical behavior of soft clay and its elastoplastic modeling", Ph.D. Dissertation, Shanghai University, Shanghai, China.
  10. Cotecchia, F. and Chandler, R.J. (2000), "A general framework for the mechanical behaviour of clays", Geotechnique, 50(4), 431-447 https://doi.org/10.1680/geot.2000.50.4.431
  11. Graham, J. and Li, E.C.C. (1985), "Comparison of natural and remolded plastic clay", J. Geotech. Eng. Div., ASCE, 111(7), 865-881. https://doi.org/10.1061/(ASCE)0733-9410(1985)111:7(865)
  12. Hong, Z.S., Liu, S.Y., Shen, S.L. and Negami, T. (2006), "Comparison in undrained shear strength between undisturbed and remolded Ariake clays", J. Geotech. Geoenviron. Eng., ASCE, 132(2), 272-275. https://doi.org/10.1061/(ASCE)1090-0241(2006)132:2(272)
  13. Hong, Z.S., Zeng, L.L., Cui, Y.J., Cai, Y.Q. and Lin, C. (2012), "Compression behaviour of natural and reconstituted clays", Geotechnique, 62(4), 291-301. https://doi.org/10.1680/geot.10.P.046
  14. Leroueil, S. and Vaughan, P.R. (1990), "The general and congruent effects of structure in natural soils and weak rocks", Geotechnique, 40(3), 467-488. https://doi.org/10.1680/geot.1990.40.3.467
  15. Liu, M.D. and Carter, J.P. (2002), "A structured cam clay model", Can. Geotech. J., 39(6), 1313-1332. https://doi.org/10.1139/t02-069
  16. Mesri, G. and Godlewski, P.M. (1977), "Time and stress-compressibility interrelationship", J. Geotech. Eng., ASCE, 103(5), 417-430.
  17. Mitchell, J.K. (1976), Fundamentals of Soil Behavior, Wiley, New York, NY, USA.
  18. Nagaraj, T.S., Murthy, B.R.S., Vatsala, A. and Joshi, R.C. (1990), "Analysis of compressibility of sensi- tive soils", J. Geotech. Eng., ASCE, 116(1), 105-118. https://doi.org/10.1061/(ASCE)0733-9410(1990)116:1(105)
  19. Roscoe, K.H. and Burland, J.B. (1968), "On the generalised Stress-strain Behavior of "Wet" Clay", Engineering Plasticity, Cambridge University Press, Cambridge, UK.
  20. Roscoe, K.H., Schofield, A.N. and Thurairajah, A. (1963), "Yielding of clay in states wetter than critical", Geotechnique, 13(3), 211-240. https://doi.org/10.1680/geot.1963.13.3.211
  21. Rouainia, M., Muir wood, D. (2000), "A kinematic hardening constitutive model for natural clays with loss of structure", Geotechnique, 50(2), 153-164. https://doi.org/10.1680/geot.2000.50.2.153
  22. Suebsuk, J., Horpibulsuk, S. and Liu, M.D. (2011), "A critical state model for overconsolidated structured clays", Comput. Geotech., 38(5), 648-658. https://doi.org/10.1016/j.compgeo.2011.03.010
  23. Yao, Y.P., Hou, W. and Zhou, A.N. (2009), "UH Model: Three-dimensional unified hardening model for overconsolidated clays", Geotechnique, 59(5), 451- 469. https://doi.org/10.1680/geot.2007.00029
  24. Yao, Y.P., Gao, Z.W., Zhao, J.D. and Wan, Z. (2012), "Modified UH Model: Constitutive modeling of overconsolidated clays based on a parabolic Hvorslev Envelope", J. Geotech. Geo-environ. Eng., ASCE, 138(7), 860-868. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000649

피인용 문헌

  1. Experimental study on the performance of compensation grouting in structured soil vol.10, pp.3, 2016, https://doi.org/10.12989/gae.2016.10.3.335
  2. Comparison of Hoek-Brown and Mohr-Coulomb failure criterion for deep open coal mine slope stability vol.60, pp.5, 2016, https://doi.org/10.12989/sem.2016.60.5.809
  3. Nonlinear Model of Soils Under Complex Stress Paths vol.36, pp.5, 2018, https://doi.org/10.1007/s10706-018-0522-y
  4. Simplified Constant Volume Simple Shear Tests on Clay vol.22, pp.8, 2018, https://doi.org/10.1007/s12205-018-0467-y
  5. Application of a modified structural clay model considering anisotropy to embankment behavior vol.13, pp.1, 2014, https://doi.org/10.12989/gae.2017.13.1.079
  6. Geotechnical characteristics and consolidation properties of Tianjin marine clay vol.16, pp.2, 2014, https://doi.org/10.12989/gae.2018.16.2.125
  7. Compression and shear responses of structured clays during subyielding vol.18, pp.2, 2014, https://doi.org/10.12989/gae.2019.18.2.121