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检索条件"任意字段=6th European Conference on Numerical Methods in Geotechnical Engineering"

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11th World Congress on Computational Mechanics, WCCM 2014, 5th european conference on Computational Mechanics, ECCM 2014 and 6th european conference on Computational Fluid Dynamics, ECFD 2014

11th World Congress on Computational Mechanics, WCCM 2014, 5...

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Joint 11th World Congress on Computational Mechanics, WCCM 2014, the 5th european conference on Computational Mechanics, ECCM 2014 and the 6th european conference on Computational Fluid Dynamics, ECFD 2014

ISBN: (纸本)9788494284472

the proceedings contain 675 papers. the topics discussed include: advanced computational techniques in geophysical sciences;computational methods in fluid-structure interactions, dynamics andvibration;coupling full-field measurements and computations: material characterisation and model identification;direct methods and constitutive modeling for plastic design by analysis;enriched finite element formulations to capture cracks, material interfaces and multiscale phenomena;evolutionary algorithms and metaheuristics in civil engineering and construction management;high-performance computing for structure mechanics and earthquake/tsunami engineering;isogeometric and high-order boundary elements methods;modeling and experimental characterization of microstructures and material instabilities;nonlinear modeling and simulation of plies and interfaces in laminated composites;qualitative and quantitative comparison of numerical methods for solving partial differntial equations.

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A study on the compression curves of reconstituted clays with water contents

A study on the compression curves of reconstituted clays wit...

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8th european conference on numerical methods in geotechnical engineering (NUMGE)

作者： Zhuang, Z. Horpibulsuk, S. Liu, M. D. Univ Wollongong Fac Engn & Informat Sci Wollongong NSW 2522 Australia Suranaree Univ Technol Sch Civil Engn Ratchasima Thailand

ISBN: (纸本)9781315751825;9781138026872

Based on Burland's void index, a simple systematic method is proposed by Liu et al. (2013), for estimating the compression behaviour of reconstituted clays. the compression behaviour of clays is idealised as linear segments in the I-nu similar to ln p' space. the variation of available data in engineering practice has been taken into consideration in the proposed method. the accuracy of the estimation increases with the level of available data. In this paper, the new method is employed to simulate the compression behaviour of clays with various water contents and the influence on the compression behaviour of reconstituted clays by water contents is analyzed.

关键词： geotechnical engineering

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numerical simulation of shear tests on rock joints models with predefined roughness

Numerical simulation of shear tests on rock joints models wi...

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8th european conference on numerical methods in geotechnical engineering (NUMGE)

作者： Menezes, J. E. DEC SG FEUP Oporto Portugal

ISBN: (纸本)9781315751825;9781138026872

the simulation of mechanical behaviour of rock joints is a valuable contribution to the validation of shear strength criteria and to understand how experimental results can be influenced by scale effects and testing conditions. Two peak shear strength criteria are applied in numerical simulations of shear tests in order to understand how a geometrical predefined joint profile can be equivalent to applying specific shear criteria to a linear interface representing that joint. Saw-toothed and standard Barton's joint profiles were considered. It was found that numerical simulations can reproduce failure laws for peak shear strength calibrated from experimental results. the development of this study is expected to have a valuable contribution to joint roughness numerical modelling specially in post-peak behaviour.

关键词： numerical models

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numerical modelling on vibroflotation soil improvement techniques using the endochronic constitutive law for sands

Numerical modelling on vibroflotation soil improvement techn...

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8th european conference on numerical methods in geotechnical engineering (NUMGE)

作者： Peco, J. Lopez-Querol, S. Univ Castilla La Mancha Dept Civil Engn E-13071 Ciudad Real Spain Univ West London Sch Comp & Technol London England

ISBN: (纸本)9781315751825;9781138026872

the vibroflotation technique is one of the most extended procedures to improve the compaction and the bearing capacity of a granular soils. It consists of the densification phenomenon produced at dry or completely drained granular soils when they are subjected to point vibrations, by means of an equipment called vibrator. this technique is usually designed according to total empirical approaches. A numerical formulation is presented in this paper, employing the endochronic based densification constitutive law, which has been implemented in a dynamic numerical finite element code formulated in axisymmetric coordinates. Absorbing boundaries have been considered in the numerical codes aiming to avoid the spurious reflection of waves in the soil limits, since they would produce not real densification ratios in the numerical computations.

关键词： Densification

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numerical investigation on the effectiveness of drainage elements used in soil nailing applications

Numerical investigation on the effectiveness of drainage ele...

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8th european conference on numerical methods in geotechnical engineering (NUMGE)

作者： Lamei, M. NiruNegar Engn Co Tehran Iran

ISBN: (纸本)9781315751825;9781138026872

the interstitial water within soils should be taken into account for soil slopes' stability. In soil nailed slopes, pore-water is usually drained out by strip drains at the wall surface, and by horizontal drains within the soil body. Such drains are a path for explicit flow of water. In this paper, effectiveness of horizontal drains is examined from unsaturated view;that is, while there is no explicit flow, drains may still help soil dry out which contributes to stability. this hypothesis is evaluated by a preliminary approximation, and by numerical modeling. the numerical modeling is carried out by devising equivalence between unsaturated evaporation from a soil body and saturated consolidation of it. A set of parameters are devised which make a practicing engineer able to use usual commercial geotechnical software to model evaporation. It is anticipated that unsaturated phenomena should be considered in devising recommendations for drainage systems in soil nail walls.

关键词： Evaporation

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On the application of the material point method for offshore foundations

On the application of the material point method for offshore...

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8th european conference on numerical methods in geotechnical engineering (NUMGE)

作者： Lim, L. J. Andreykiv, A. Brinkgreve, R. B. J. Plaxis BV Delft Netherlands

ISBN: (纸本)9781315751825;9781138026872

With the on-going development of the Material Point Method (MPM) for geotechnical applications, it becomes clear that this method has a strong potential in the analysis of offshore foundations. In particular the installation of monopiles, suction caissons, spud cans and anchors as well as the analysis of their installation effects involve large deformations and material flow has to be taken into account. Although quite versatile in general, the Finite Element Method (FEM) has its limitations when it comes to very large deformations and material flow. the MPM fills the gap and enables such analyses which were not feasible before. Particular developments that have enabled the aforementioned applications are: (i) Smooth transition from Finite Element mesh to MPM domain, (ii) Smooth contact between soil and structures (iii) Coupling between deformation, effective stress and pore pressure to simulate undrained conditions. this paper will demonstrate an example of spudcan penetration into fully saturated soil with focus on the capabilities of the Material Point Method in geotechnical engineering. Conclusions are drawn on possibilities and further requirements.

关键词： geotechnical engineering

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3D numerical analysis and performance of deep excavations in Kenny Hill formation

3D numerical analysis and performance of deep excavations in...

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8th european conference on numerical methods in geotechnical engineering, NUMGE 2014

作者： Law, K.H. Roslan, H. Zubaidah, I. KH Geotechnical Services Kuala Lumpur Malaysia Department of Civil Engineering University of Malaya Kuala Lumpur Malaysia

ISBN: (纸本)9781138026889

this study back analyzed stiffness parameters in residual soils derived from the Kenny Hill formation using both 2D and 3D finite element (FE) studies through two case histories in Kuala Lumpur, Malaysia. An elasto-plastic Hardening Soil (HS) model implemented in the commercial finite element program PLAXIS was used in the studies. 3D FE back-analyses have been conducted and compared with the measured horizontal wall deflections to investigate the effect of soil stiffness parameters of HS model on the horizontal wall deflections. Parametric studies revealed that the horizontal wall deflections at each stage of excavation could be reasonably computed with a simple correlation between stiffness parameters with field standard penetration tests (SPT) N values for HS model. the correlation between the triaxial secant Young's modulus at 100 kPa reference pressure, Eref50 of HS model was found approximately equal to 1500NkPa. the case histories presented here show that whilst it is important to define the soil modulus parameters, it is equally important to take into consideration the geometrical or corner effect when evaluating the performance of excavations. © 2014 Taylor & Francis Group, London.

关键词： Finite element method

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numerical treatment of singularities in critical state modelling of soil behaviour

Numerical treatment of singularities in critical state model...

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8th european conference on numerical methods in geotechnical engineering (NUMGE)

作者： Marado, J. M. P. Marques, J. M. M. C. Inst Politecn Viseu Escola Super Tecnol Dept Engn Civil Viseu Portugal Univ Porto Dept Engn Civil Fac Engn Oporto Portugal

ISBN: (纸本)9781315751825;9781138026872

the elastoplastic finite element modelling of normally consolidated and overconsolidated clayey soils with Critical State Models requires that careful consideration be given to the diverse singularities present in the respective yield surfaces if numerical stability, convergence and accuracy are to be achieved in the stress updating procedure that is central to the incremental-iterative approach. In this paper a detailed analysis is presented of the backward Euler stress update procedure in singularity regions of the modified Cam-clay and p-q-theta models, with recourse to visual aids specifically developed for this purpose.

关键词： Finite element method

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numerical seismic response analysis of Keddara dam under differential motions

Numerical seismic response analysis of Keddara dam under dif...

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8th european conference on numerical methods in geotechnical engineering, NUMGE 2014

作者： Louadj, S. Bahar, R. Vincens, E. Laouami, N. Laboratoire Géomatériaux Environnement et Aménagement Université de Tizi-Ouzou Algeria Laboratoire de Tribologie et Dynamique des Systèmes Ecole Centrale Université de Lyon Lyon France Centre National de Recherche Appliquée en Génie Parasismique CGS Rue Kaddour Rahim Alger Algeria

ISBN: (纸本)9781138026889

Northern Algeria is a highly seismic area. During the last two decades, it experienced several moderate to strong destructive earthquakes. On May 21, 2003, Algiers-Boumerdes region was struck by a destructive magnitude 6.8 (Mw) earthquake. Keddara dam is a rockfill dam in Boumerdes region. the present study concerns analysis of the seismic response of this dam during Boumerdes main shock *** acceleration records of the main shock were recorded at the stations of the national accelerograph network, which furnishes the records on the rock, and crest near the maximum section of the dam. the behavior of both rockfill and core of the dam is described using Ramberg-Osgood nonlinear relationship.A comparison with real earthquake records reveals that uniform motions overestimate the accelerations at the crest and underestimate the shear stress at the base. the effects of spatial varying of ground motion on dynamic response of such structure must be considered. © 2014 Taylor & Francis Group, London.

关键词： Dams

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A numerical investigation on debris avalanche propagation

A numerical investigation on debris avalanche propagation

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8th european conference on numerical methods in geotechnical engineering (NUMGE)

作者： Cuomo, Sabatino Cascini, Leonardo Pastor, Manuel Castorino, Giuseppe Claudio Univ Salerno Dept Civil Engn Fisciano Italy Univ Politecn Madrid Dept Appl Math & Comp Sci Madrid Spain

ISBN: (纸本)9781315751825;9781138026872

the paper deals with a numerical investigation of the propagation stage of debris avalanches. Two complementary cases are analyzed: i) a benchmark open slope followed by almost flat piedmont, ii) a case study of Southern Italy which involved pyroclastic soils originating from Vesusius volcano. A hydro-mechanical coupled depth-integrated Smoothed Particle Hydrodynamics (SPH) model is used. Irregular topography of slope, bed entrainment and pore water pressure variations are taken into account. the key role of bed entrainment is outlined and a satisfactory back-analysis of the case study is obtained. Globally, the achieved results indicate that the chosen model is an advisable tool for the analysis of debris avalanches.

关键词： Debris

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