Effect of Soil Constitutive Models on Numerical Modeling of Cantilever Retaining Wall

Document Type : Research Paper

Authors

1 Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz,

2 Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran

3 Ph.D. of Geotechnical Engineering, Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran.

Abstract

In the present study static response of cantilever retaining walls have been investigated by consideration of various soil constitutive models by means of finite element method with using PLAXIS 2-D software. Simulations have been performed at heights of 3, 6, and 9 meters retaining walls with considering two types of soils (cohesive and cohesionless) as backfill material. In this study, analysis have been conducted for two kinds of cohesionless backfill (loose and dense sand in dry condition) and at both conditions, saturated and unsaturated, for cohesive backfill. Analysis have been carried out by using three constitutive behavioral methods: Mohr-Coulomb (MC), Hardening-Soil (HS) and Hardening soil model with Small-Strain stiffness (HSS) for cohesionless backfill and additional method, Soft Soil model (SS), for cohesive backfill. The results show that, for cohesionless and cohesive backfill materials the lateral forces acting on the retaining wall are underestimated by the MC and SS constitutive models, respectively.

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[1] Schweiger, H.F., (2010), Design of deep excavations with FEM - influence of constitutive model and comparison of EC7 design approaches, Proc. of the 2010 Earth Retention Conference.
[2] Schweiger, H.F., (2014), Influence of EC7 design approaches on the design of deep excavations with FEM, 2014 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin, geotechnik, Vol. 37, pp.169-176.
[3] Abdelouhab, A., Dias, D. and Freitag, N., (2010), Numerical analysis of the behaviour of mechanically stabilized earth walls reinforced with different types of strips, Geotextiles and Geomembranes, Vol. 29, pp. 116-129.
[4] مجنونی، ع.، اردکانی، ع. و یزدانی، م. (1391)، مقایسه مدل‌های رفتاری موهر کولمب، خاک سخت شونده و HSS در شبیه‌سازی عددی دیوارهای میخکوبی شده، نهمین کنگره بین المللی مهندسی عمران، دانشگاه صنعتی اصفهان.
[5] Tschuchnigg, F., (2012), 3D Finite Element Modelling of Deep Foundations Employing an Embedded Pile Formulation, Graz university, Dissertation.
[6] Aghazadeh Ardebili, Z., (2015), Analyses of Capacity and Response of Plate Anchors: 2-D and 3-D Modeling with Advanced Constitutive Soil Models, North Carolina State University, for the Degree of Doctor of Philosophy.
[7] PLAXIS Material Models Manual, Version 8.
[8] Zarnani, S. and Bathurst, R.J., (2009), Numerical parametric study of expanded polystyrene (EPS) geofoam seismic buffers, Canadian Geotechnical Journal, Vol. 46(3), pp. 318-338.
[9] Zarnani, S. and Bathurst, R.J., (2010), Numerical parametric study of geofoam seismic buffers with different constitutive models, 9th International Conference on Geosynthetics, Brazil, pp. 1665- 1670.
[10] Athanasopoulos A, Zekkos, Lamote K, Athanasopoulos GA, (2012), Use of EPS geofoam compressible inclusions for reducing the earthquake effects on yielding earth retaining structures, Soil Dynamics and Earthquake Engineering, Vol. 41, pp. 59-71.