A simple critical state model with small strain nonlinearity for overconsolidated soils

• Autorzy: Gryczmański M. , Uliniarz R.
• Języki publikacji: EN

Abstrakty

EN

The paper presents a reasonably advanced constitutive law for soil - a hybrid of the Modified Cam Clay and the Fahey - Carter models. The Modified Cam Clay model is an isotropic hardening elasto-plastic one originated by Burland (1967) within the critical state soil mechanics. This model is widely applied in today's geotechnical analysis. It realistically describes mechanical soil behaviour in the normal consolidation states. The other one is designed to ensure more adequate soil responses to reloading paths (within the overconsolidation stress subspace), particularly in the range of small strains. The model has been implemented in the FEM computer code Z_SOIL.pc 7.32. To test the influence of the small strain nonlinearity on soil - structure interaction as well as to exhibit the ability of the proposed model to simulate this effect realistically, a comparative study based on the FEM solution has been carried out. As a benchmark, a strip footing founded on a thick homogeneous cohesive soil layer in two different overconsolidation states has been used. The soil response to a load has been simulated assuming two models: original MCC and FC+MCC.

Słowa kluczowe

EN

overconolidation; small strain nonlinearity; modified Cam-Clay; Fahey-Carter model

• Wydawca: Wydawnictwo Politechniki Poznańskiej
• Czasopismo: Foundations of Civil and Environmental Engineering
• Rocznik: 2008
• Tom: No. 12
• Strony: 49--60
• Opis fizyczny: Bibliogr. 8 poz.

Twórcy

autor

Gryczmański M.

autor

Uliniarz R.

• Silesian University of technology, Department of Geotechnics Tel.: [phone]; fax: [phone],

Bibliografia

• 1.Burland J.B.: Deformation of soft clay, Ph.D. Thesis, Univ. Cambridge 1967.
• 2.Burland J.B.: Small is beautiful - the stiffness of soils at small strains, 9th Bjerrum Memorial Lectures, Canadian Geotechnical Journal, 26 (1989), 499-516.
• 3.Duncan J.M.: Hyperbolic stress - strain relationships, Workshop on Limit Equilibrium, Plasticity and Generalized Stress - Strain in Geotechnical Engineering, Mc Gill University, ASCE, New York 1980, 443 - 468.
• 4.Duncan J.M., Chang C.-Y.: Nonlinear analysis of stress and strain in soils, Journal of Soil Mechanics and Foundation Engineering Division Proceedings of ASCE Vol.96 (1970), SM5, 1655 - 1681.
• 5.Fahey M., Carter J.P.: A finite element study of the pressuremeter in sand using a nonlinear elastic plastic model. Canadian Geotechnical Journal, vol. 30 (1993), 348-362.
• 6.Jardine R.J., Potts D.M., St.John H.D., Hight D.W.: Some practical applications of a non-linear ground model, Proceedings of 10th European Conferenceof Soil Mechanics and Foundation Engineering, Firence, Ses.2, A.A. Balkema, Rotterdam 1991, Vol.1, 223-228.
• 7.Jastrzębska M.: Calibration and verification of a single surface elasto – plastic model for soil with strongly nonlinear anisotropic hardening law, Ph.D. Thesis (in Polish), Silesian University of Technology, Gliwice 2002.
• 8.Viggiani G., Atkinson J.H.: Stiffness of fine - grained soil at very small strains, Géotechnique, 45, 2 (1995), 249 - 265.