Improved formulation of the Hardening Soil model in the context of modeling the undrained behavior of cohesive soils

• Autorzy: Truty A. , Obrzud R.

Identyfikatory

DOI

10.1515/sgem-2015-0022

• Języki publikacji: EN

Abstrakty

EN

The analysis of an important drawback of the well known Hardening Soil model (HSM) is the main purpose of this paper. A special emphasis is put on modifying the HSM to enable an appropriate prediction of the undrained shear strength using a nonzero dilatancy angle. In this light, the paper demonstrates an advanced numerical finite element modeling addressed to practical geotechnical problems. The main focus is put on serviceability limit state analysis of a twin-tunnel excavation in London clay. The two-phase formulation for partially saturated medium, after Aubry and Ozanam, is used to describe interaction between soil skeleton and pore water pressure.

Słowa kluczowe

EN

soil constitutive modeling; undrained shear strength; deep excavations

• Wydawca: De Gruyter
• Czasopismo: Studia Geotechnica et Mechanica
• Rocznik: 2015
• Tom: Vol. 37, nr 2
• Strony: 61--68
• Opis fizyczny: Bibliogr. 14 poz., tab., rys.

Twórcy

autor

Truty A.

• Institute of Geotechnics, Cracow University of Technology, Poland

autor

Obrzud R.

• GeoMod S.A., Switzerland

Bibliografia

• [1] ZSoil manual, Elmepress and Zace Services Limited, Lausanne, Switzerland, 2014.
• [2] ADDENBROOKE T., POTTS D., PUZRIN A., The influence of prefailure soil stiffness on the numerical analysis of the tunnel construction, Geotechnique, 1997, 47(3), 693–712.
• [3] AUBRY D., OZANAM O., Free-surface tracking through nonsaturated models, [in:] Swoboda (ed.), Numerical Methods in Geomechanics, Balkema, Innsbruck, 1988, 757–763.
• [4] BENZ T., Small-strain stiffness of soils and its numerical consequences, Ph.D. thesis, University of Stuttgart, 2006.
• [5] GASPARRE A., Advanced laboratory characterisation of London clay, Ph.D. thesis, Imperial College, 2005.
• [6] IRMAY S., On the hydraulic conductivity of unsaturated soils, Trans. Am. Geophys. Union, 1956, 35, 463–468.
• [7] LADD C., FOOTT R., New design procedure for stability of soft clays, Journal of the Geotechnical Engineering Division ASCE, 1974, 100 (7), 763–786.
• [8] OBRZUD R., TRUTY A., The hardening soil model – a practical guidebook, Technical Report Z Soil, PC 100701, Zace Services, Ltd., 2013.
• [9] SCHANZ T., Zur Modellierung des mechanischen Verhaltens von Reinbungsmaterialien, Mitt. Inst., für Geotechnik, 45, Universitat Stuttgart, 1998.
• [10] SCHANZ T., VERMEER P., BONIER P., Formulation and verification of the Hardening Soil Model, Beyond 2000 in Computational Geotechnics, Balkema, Rotterdam, 1999.
• [11] TRUTY A., On certain classes of mixed and stabilized mixed finite element formulations for single and twophase geomaterials, Zeszyty Naukowe Politechniki Krakowskiej, Seria Inżynieria Środowiska 48, Kraków, 2000.
• [12] TRUTY A., ZIMMERMANN T., Stabilized mixed finite element formulations for materially nonlinear partially saturated two-phase media, Computer Methods in Applied Mechanics and Engineering, 2006, 195, 1517–1546.
• [13] VAN GENUCHTEN M.T., A closed form equation for predicting the hydraulic conductivity of unsaturated soils, Soil Sciences Am. Soc., 1980, 44, 892–898.
• [14] VIGGIANI G., ATKINSON J., Stiffness of fine grained soil at very small strain, Geotechnique, 1995, 45(2), 249–265.