Abstract
The modified Cam-clay model has been widely adopted as the theoretical framework for constitutive modelling of clays. However, there is so far no such model for sands on the basis of which further development can be carried out. Based on the main differences in the behaviours exhibited during isotropic compression and shear processes between sands and clays, a basic constitutive model for sands is proposed by introducing the compressive hardening parameter \(p_{{\text{s}}}\) and the critical state parameter \(\chi\) into the formulations of normal compression line and elliptic yield surface of the modified Cam-clay model respectively. When the new compressive hardening parameter and critical state parameter both equal 0, the normal compression line and yield surface of the proposed model for sands can degrade into the corresponding ones of the modified Cam-clay model for clays. The comparison between test data and the model prediction indicates that the proposed model can predict the stress–strain relationship of normally compressed sands (i.e. the loosest sands without structure) well. The proposed model can be considered as the basic framework for further research on constitutive modelling of sands due to its clearly defined assumption, simple structure and good capability in model prediction.
References
Collins IF, Kelly PA (2002) A thermomechanical analysis of a family of soil models. Géotechnique 52(7):507–518. https://doi.org/10.1680/geot.2002.52.7.507
Ishihara K (1993) Liquefaction and flow failure during earthquakes. Geotechnique 43(3):351–451
Lade PV, Bopp PA (2005) Relative density effects on drained sand behavior at high pressures. Soils and Foundation 45(1):1–13
Richardson D (1988) Investigations of threshold effects in soil deformations. City University London
Roscoe KH, Burland JB (1968) On the generalized stress-strain behaviour of wet clay. Engineering Plasticity. 535–609
Roscoe K, Schofield A, Thurairajah A (1963) Yielding of clays in states wetter than critical. Geotechnique 13(3):211–240
Verdugo R, Ishihara K (1996) The steady state of sandy soils. Soils Found 36(2):81–91
Yao YP, Hou W, Zhou AN (2009) UH model: three-dimensional unified hardening model for overconsolidated clays. Géotechnique 59(5):451–469. https://doi.org/10.1680/geot.2007.00029
Yao Y-P, Liu L, Luo T, Tian Y, Zhang J-M (2019) Unified hardening (UH) model for clays and sands. Comput Geotech 110:326–343
Yao Y-P, Wang N-D (2014) Transformed stress method for generalizing soil constitutive models. J Eng Mech 140(3):614–629. https://doi.org/10.1061/(asce)em.1943-7889.0000685
Yao Y-P, Zhou A-N, Lu D-C (2007) Extended transformed stress space for geomaterials and its application. J Eng Mech 133(10):1115–1123
Acknowledgements
This study was supported by the National Key Research and Development Plan of China (Grant No. 2018YFE0207100), National Natural Science Foundation of China (Grant No. 51979001), and National Basic Research Program of China (Grant No. 2014CB047006). Thanks to Dr. Wenjie Cui for his constructive suggestions during the revision of this paper.
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Yao, Y., He, G., Liu, L. et al. A basic constitutive model for sands. Acta Geotech. 17, 2021–2027 (2022). https://doi.org/10.1007/s11440-021-01267-w
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DOI: https://doi.org/10.1007/s11440-021-01267-w