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

共 818 条记录，以下是281-290 订阅

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Use of generalized material point method (GIMP) to simulate shallow wedge penetration

Use of generalized material point method (GIMP) to simulate ...

引用

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

作者： Llano-Serna, M. A. Farias, M. M. Univ Brasilia Dept Civil & Environm Engn Brasilia DF Brazil

ISBN: (纸本)9781315751825;9781138026872

this paper investigates a numerical solution of a semi-infinite mass of soil being penetrated by a smooth and rigid wedge. Traditional methods such as the finite element method (FEM) meet some difficulties when large strains are involved. Hence the generalized material point method (GIMP) is used to simulate the penetration process, as a first approximation to study other problems involving large strains in geotechnical engineering. the GIMP includes many attractive features in solving engineering problems involving large deformations. Its formulation is shortly described and then an analytical solution is compared with numerical results for different depths of penetration. the results show that the method describes qualitative and quantitatively the phenomenon of penetration. Some differences comparing numerical and analytical results are attributed to artificial roughness introduced by the geometric discretization. Other reasons could be explained by the scheme of integration used in the constitutive law and time stepping, specifically during the transition between elastic and plastic behavior in the constitutive model adopted.

关键词： geotechnical engineering

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Modelling groundwater flow in Tikkurila area, Vantaa

Modelling groundwater flow in Tikkurila area, Vantaa

引用

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

作者： Lottanen, E. Korkiala-Tanttu, L. Mataic, I. Department of Civil and Environmental Engineering Aalto University Espoo Finland

ISBN: (纸本)9781138026889

Starting on 2011 the construction of three new buildings with structures extending below the groundwater table have been started in Tikkurila area,Vantaa. there is a risk that these buildings would affect the groundwater flow and decrease permanently the level of the groundwater table negatively affecting functionality of the structures in the impact area. In this paper the impact the new buildings have on the level of the groundwater table in the long-term situation was studied by compiling a three-dimensional groundwater model of the area. It was also studied how a drainage layer built around the buildings would affect the level of the groundwater table. Finally, paper provides assessment of the effects of permanent groundwater level decrease on settlements of the street passing the area affected. © 2014 Taylor & Francis Group, London.

关键词： Groundwater flow

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Dynamic behaviour of plate element simulating asphalt revetment of sea dike during wave attack

Dynamic behaviour of plate element simulating asphalt revetm...

引用

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

作者： Tan, S. Hicks, M.A. Vermeer, P.A. Section of Geo-Engineering Faculty of Civil Engineering and Geosciences Delft University of Technology Delft Netherlands Deltares Delft Netherlands

ISBN: (纸本)9781138026889

Approximately 400 kilometres of Dutch sea dikes are protected by asphalt revetments to prevent damage from erosion and repeated wave attacks during storms. It is necessary to study the fatigue behaviour of the asphalt revetment and underlying soil. However, to model a thin layer of material with high stiffness, a very fine mesh is often needed in numerical simulations. this decreases the critical time step in explicit time integration algorithms, severely affecting simulation performance. To avoid this problem, a three-noded plate element with fifteen degrees-of-freedom is proposed. It is implemented in a dynamic finite element code, and validated against analytical and numerical solutions. the plate element is then used to model the asphalt revetment of a sea dike, to study the excess pore pressures and displacements generated during cyclic wave attack in a severe storm. the results indicate that the plate element gives realistic results. © 2014 Taylor & Francis Group, London.

关键词： numerical models

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Seismic amplification factors for mountain slopes

Seismic amplification factors for mountain slopes

引用

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

作者： Park, D. Ahn, J.-K. Lee, J.-H. Department of Civil and Environmental Engineering Hanyang University Korea Republic of

ISBN: (纸本)9781138026889

Seismic stability of a slope is most often evaluated by performing pseudo-static analysis or Newmark sliding block analysis. In both methods, the geometric amplification/deamplification effect of the slope is not accounted for and the maximum acceleration representative of the bedrock or the site coefficients derived for horizontally layered soil profiles are used. this paper performs a series of nonlinear dynamic analyses and derives the seismic amplification factors for mountain slopes. the factors are calculated from 1) average acceleration of the soil block and 2) the shear stresses mobilized along the potential failure surface. It is shown that amplification factors increase with the depth of the soil deposits. the effect of slope angle and strength is also demonstrated. the factors derived for horizontally layered deposits are shown to be not suitable for mountain slopes. © 2014 Taylor & Francis Group, London.

关键词： Shear stress

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Simulation of pore pressure accumulation under cyclic loading using finite volume method

Simulation of pore pressure accumulation under cyclic loadin...

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

作者： Tang, T. Hededal, O. Department of Civil Engineering Technical University of Denmark Kgs. Lyngby Denmark Marine and Foundation Engineering COWI Kgs. Lyngby Denmark

ISBN: (纸本)9781138026889

this paper presents a finite volume implementation of a porous, nonlinear soil model capable of simulating pore pressure accumulation under cyclic loading. the mathematical formulations are based on modified Biot's coupled theory by substituting the original elastic constitutive model with an advanced elastoplastic model suitable for describing monotonic as well as cyclic loading conditions. the finite volume method is applied to discretize these formulations. the resulting set of coupled nonlinear algebraic equations are then solved by a 'segregated' solution *** efficient return mapping algorithm is used to calculate the stress and strain relation in each control volume level. Test cases show very good performance of the model. © 2014 Taylor & Francis Group, London.

关键词： Finite volume method

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numerical simulation of a deep excavation in London Clay

Numerical simulation of a deep excavation in London Clay

引用

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

作者： Measham, P.G. Taborda, D.M.G. Zdravković, L. Potts, D.M. Department of Civil and Environmental Engineering Imperial College London United Kingdom

ISBN: (纸本)9781138026889

the requirement for accurate modelling of the small-strain stiffness behaviour of soils in numerical analysis has been driven by the need to establish serviceability limit states for geotechnical structures. A common approach when tackling this problem is to employ a non-linear elastic constitutive model coupled with an appropriate failure criterion. the latter establishes the shear strength of the material and allows the evaluation of plastic deformations at large strains, while the former typically reproduces the effect of stress and strain levels on the shear and bulk stiffness of the soil. this paper evaluates distinct strategies for reproducing the stiffness of a material within the context of a new small-strain stiffness model. After introducing the constitutive model and describing its key features, a procedure to determine its parameters is proposed and demonstrated for London Clay. Subsequently, the relative impact of the different methods of interpreting the effect of changes in strain path direction on the stiffness of the material is investigated by performing finite element analyses of a deep excavation in London Clay. © 2014 Taylor & Francis Group, London.

关键词： Constitutive models

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Consolidation analyses considering gas entrapment below the phreatic surface

Consolidation analyses considering gas entrapment below the ...

引用

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

作者： Stelzer, O. Montenegro, H. Odenwald, B. Federal Waterways Engineering and Research Institute Karlsruhe Germany

ISBN: (纸本)9781138026889

In Terzaghi's classical consolidation theory complete water saturation below the phreatic surface and incompressibility of the pore water is assumed so that water storage is supposed to be dominated merely by the compressibility of the soil skeleton. Case studies from engineering practice however can be reproduced only under the assignment of a much larger water storage volume than that derived from the soil properties. In this study the presence of small volumes of gas entrapped in the pores below the phreatic level is considered, for example as a result of natural water level fluctuations. the impact of the enhanced compressibility (or storage) of the water-gas mixture on the propagation of rapid external total stress changes due to static or hydraulic loading are examined based on Biot's coupled flow-deformation theory by means of one- And two-dimensional FE-calculations. © 2014 Taylor & Francis Group, London.

关键词： Compressibility

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Deep cylindrical excavations in soft soils retained by reinforced concrete diaphragm walls: Analysis considering the consolidation effect

Deep cylindrical excavations in soft soils retained by reinf...

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

作者： Borges, J.L. Alves, A.N. Department of Civil Engineering Faculty of Engineering University of Porto Porto Portugal

ISBN: (纸本)9781138026889

Using a computer code based on the finite element method, a deep cylindrical excavation in soft clay retained by a reinforced concrete diaphragm wall is analyzed, the consolidation effect being considered. the computer code incorporates the Biot's consolidation theory (coupled formulation of the equilibrium and flow equations) with soil constitutive relations simulated by the p-q-θ critical state model. the p-q-θ model is an extension of the Modified Cam-Clay model into the three-dimensional stress space using the Mohr-Coulomb failure criteria. Particular attention is given, during and after the construction period, to the analysis of the excess pore pressure, stress levels and displacements in the soil, as well as stresses and displacements on the wall. © 2014 Taylor & Francis Group, London.

关键词： Finite element method

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Slope stability of soft soils using pile foundations considering the creep effects

Slope stability of soft soils using pile foundations conside...

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

作者： Rahmatian, M. Noorzad, A. Mahboubi Ardakani, A.R. Faculty of Water and Environmental Engineering Shahid Beheshti University Tehran Iran

ISBN: (纸本)9781138026872

Nowadays, more and more construction activities are carried out on highly compressible layers of soft soil. the engineering challenges for this kind of soil are that it commonly exhibits large amount of time-dependent strains. When soil is subjected to a constant effective stress, it deforms over time that is called creep. Creep behavior influences the long-term settlement of grounds and movement of slopes and also piles that are used for slope stability due to lateral loading. Understanding the lateral response of pile placed in slope is an important issue of concern. In order to investigate slope stability of soft soils using pile foundation, in this paper the analyses have been performed for the pile located at the crest of the slope and at a distance from the crest considering soft soil creep. © 2014 Taylor & Francis Group.

关键词： Slope stability

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Influence of hydraulic hysteresis on spherical cavity expansion results

Influence of hydraulic hysteresis on spherical cavity expans...

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

作者： Yang, H. Russell, A.R. Centre for Infrastructure Engineering and Safety School of Civil and Environmental Engineering University of New SouthWales Sydney NSW Australia

ISBN: (纸本)9781138026889

this study explored the effect of the hydraulic hysteresis on the theoretical solutions of spherical cavity expansion problems in unsaturated soils for three different drainage conditions (constant moisture content condition, constant suction condition and constant Χs condition). Special attentionwas given to the determination of effective stress parameters, hydraulic hysteresis and dependency of the soil-water characteristic curve on volumetric strain. Hydraulic hysteresis was incorporated by considering the initial state in the ln Sr∼ln s plane as an input parameter. Experimental data of Bourke silt (Uchaipichat, 2005 and Khalili & Zargarbashi, 2010) are adopted from literature. For simplification, analysis was carried out only on spherical cavity expansion problems to give an insight into how the results were influenced by hydraulic hysteresis. © 2014 Taylor & Francis Group, London.

关键词： Soil moisture

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