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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271-280 订阅

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Effect of material properties on seismic response of non-yielding retaining walls

Effect of material properties on seismic response of non-yie...

引用

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

作者： Bigdeli, A.M. El-Emam, M.M. American University of Sharjah Sharjah United Arab Emirates

ISBN: (纸本)9781138026889

In this paper, a numerical model developed and validated against carefully conducted experimental model was used to carry out a parametric study to investigate the influence of material design parameters on the seismic response of nonyielding retaining walls. the numerical model was developed using the program FLAC and the material properties used in the numerical model were determined from routine laboratory tests. Material properties such as backfill soil friction angle, wall panel elastic modulus and degree of sand backfill consolidation (degree of compaction), were varied between the numerical models. Effects of these properties on the wall lateral deflection, lateral earth pressure magnitudes and distributions, and horizontal and vertical earth force reactions at both top and bottom boundaries were investigated. Selected results for the influence of input parameters on the locations of the lateral earth forces during and at the end base shaking are also reported. © 2014 Taylor & Francis Group, London.

关键词： numerical models

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Influence of a wave barrier (EPS) on the dynamic behavior of the surrounding soil

Influence of a wave barrier (EPS) on the dynamic behavior of...

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

作者： Xu, L. Kellezi, L. GEO - Danish Geotechnical Institute Lyngby Denmark

ISBN: (纸本)9781138026889

Problems related to vibrations of foundations have required increased attention during the past two decades, and notable advances have been made during the past ten years. Recently contributions include new theoretical procedures for investigating the dynamic responses of foundations. A laboratory method has been presented describing the dynamic behavior of soil. As an alternative to the laboratory method, in order to compare the results of the investigation numerical method is applied to study the effects of the in-filled material Expanded Polystyrene (EPS) acted as a wave barrier on the behavior of the particle velocity transmitting in the subsoil under vibration. Two-dimensional axisymmetric models are used to simulate the test conditions. Absorbent boundaries are specified at the bottom and right side boundary. the physical damping due to viscous effect is taken into account by Rayleigh damping. © 2014 Taylor & Francis Group, London.

关键词： Damping

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Dynamic analyses of propped retaining structures

Dynamic analyses of propped retaining structures

引用

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

作者： Tropeano, G. Soccodato, F.M. Department of Civil and Environmental Engineering and Architecture Cagliari Italy

ISBN: (纸本)9781138026889

the paper presents the main results of several numerical dynamic analyses of propped embedded retaining structures. the numerical model entails the static condition of an excavation 4m height in presence of a pair of retaining cantilever walls in a dry, coarse-grained soil. Successively, two structural elements (props) connecting the opposite walls have been introduced. Two strong-motion acceleration time histories, recorded during two Italian earthquakes, and two equivalent analytical waveforms have been applied to the bottom of the model. the results indicate a very complex response of the system, due to the effects of local seismic response and soil-structure interaction phenomena. Increments of forces acting on structural elements due to seismic actions are significant;however, yield bending moments of wall section are only reached for seismic events of high intensity. © 2014 Taylor & Francis Group, London.

关键词： Earthquakes

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numerical modeling of tunneling effects on adjacent structures

Numerical modeling of tunneling effects on adjacent structur...

引用

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

作者： Elleboudy, A.M. Dawood, W.A. Saleh, N.M. Faculty of Engineering at Shobra Benha University Cairo Egypt

ISBN: (纸本)9781138026889

the prediction of tunnel-induced building deformation becomes a key issue in tunnel construction process. Current design approaches are conservative and lead to expensive protective measures. this paper introduces a three dimensional elasto-plastic finite difference model to predict building damage due to tunnel construction taking into account the interaction between building stiffness, tunnel and soil to refine the prediction of building deformation by generating settlement prediction/building damage assessment charts. Ground surface deformation and strains induced in buildings were investigated and compared with field measurements in two case studies;a building due to the construction of Cairo Metro Line 3, and another due to the construction of the Jubilee line extension tunnel. Reasonable agreement was found between the observed field measurements and the predicted results using the 3D numerical simulation. © 2014 Taylor & Francis Group, London.

关键词： Forecasting

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numerical analysis of thermo-mechanical behavior of energy pile foundations

Numerical analysis of thermo-mechanical behavior of energy p...

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

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

ISBN: (纸本)9781138026889

One of the appropriate alternatives to provide energy for buildings as well as taking a step toward reducing the global warming effects is the utilization of renewable energy sources. Shallow geothermal energy provides enough energy for domestic usage that can be accessed by heat pumps and different types of absorber pipes. In this paper two basic parameters of the system;magnitude of constant ground temperature and its neutral depth in different climates with various groundwater levels are introduced. the effect of thermal loading on bearing capacity of single pile has been *** the behavior of piles under thermo-mechanical loading has been studied that may be useful in the design of energy piles. © 2014 Taylor & Francis Group, London.

关键词： Piles

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Analytical and numerical investigations on the vertical seismic site response

Analytical and numerical investigations on the vertical seis...

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

作者： Han, Bo Zdravković, Lidija Kontoe, Stavroula Department of Civil and Environmental Engineering Imperial College London United Kingdom

ISBN: (纸本)9781138026889

In this paper, the site response due to the vertical component of the ground motion is analytically and numerically investigated. Firstly, a one dimensional (1D) total-stress analytical solution is studied in frequency domain and compared with the numerical solution obtained from finite element (FE) time-domain analyses, showing a satisfactory agreement. Subsequently, the site response to the vertical ground motion is further investigated, considering solid-fluid interaction, with fully coupled time-domain FE *** undertaken parametric studies showthat the predicted dynamic response is strongly affected by the parameters characterising the hydraulic phase, i.e. the soil permeability and loading conditions, both in terms of frequency content and amplification. It is therefore suggested that coupled consolidation analysis is necessary to accurately simulate site response subjected to vertical ground motion. © 2014 Taylor & Francis Group, London.

关键词： Finite element method

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Advanced constitutive model calibration using genetic algorithms: Some aspects

Advanced constitutive model calibration using genetic algori...

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

作者： Pereira, C. Maranha, J.R. Brito, A. Geotechnical Department National Laboratory for Civil Engineering Lisbon Portugal

ISBN: (纸本)9781138026872

the complex nature of soil behaviour can only be modelled by advanced constitutive models. this type of models has the disadvantage of requiring a great number of parameters (material model constants and internal variables initial values) that must be defined. the application of Genetic Algorithms, GAs, appears to be a useful technique to solve this type of problem. Previous applications of GAs to the determination of soil models' parameters have shown some efficiency and flexibility. However, some questions are not completely clarified when the methodology is applied to advanced constitutive models, such as: the amount of information required to obtain a "unique" solution in terms of parameters, the evolution of the parameters that have no influence on the particular type of test being simulated and the definition of a criterion to evaluate the similarity between polygonal curves. this paper intends to clarify some of these topics. © 2014 Taylor & Francis Group.

关键词： Constitutive models

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Probabilistic evaluation of dynamic response of caisson quay walls in soil improved by fiber: A numerical study

Probabilistic evaluation of dynamic response of caisson quay...

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

作者： Jafarian, Y. Miraei, M. Lashgari, A. Shakeri, P. Geotechnical Engineering Research Center International Institute of Earthquake Engineering and Seismology Tehran Iran Department of Civil Engineering Semnan University Semnan Iran Department of Civil Engineering Noshirvani University of Technology Babol Iran

ISBN: (纸本)9781138026889

As an appropriate and economical material, polymer fiber has been widely used for soil improvement. Past experiences show that fibers could increase shear strength, reduce permeability, and increase liquefaction resistance of soil. this paper focuses on the dynamic response and permanent displacement of caisson quay walls in Kobe Port that was damaged during the 1995 Kobe earthquake. the seismic behavior of this soil-structure system is studied using numerical simulations with the FLAC program. Results of past experimental study on the soil-fiber mixtures are employed in order to infer the enhanced parameters of the improved foundation soil. It is shown that use of fiber for improvement of the wall foundation has a significant effect on the system response and the wall demonstrates more appropriate seismic performance. the results are presented in terms of fragility curves prior to and after soil improvement. © 2014 Taylor & Francis Group, London.

关键词： Caissons

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Influence of dynamic soil-structure interaction on building response to ground vibration

Influence of dynamic soil-structure interaction on building ...

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

作者： Andersen, L.V. Department of Civil Engineering Aalborg University Aalborg Denmark

ISBN: (纸本)9781138026889

Vibration from traffic and pile driving are an increasing problem in densely populated areas. To assess vibration levels in new or existing buildings near construction sites, roads or railways in the design phase, valid models for prediction of wave transmission via the ground and into a building must be used. In this regard it is often assumed that a no significant back coupling from the building to the ground exists. thus, a model with free-field vibrations from the ground provides input at the base of the building model. the aim of the present paper is to examine whether and to which extent this assumption makes sense. For this purpose, models with and without soil-structure interaction are compared for a variety of cases with respect to soil conditions, construction material and presence of a cellar under the building. © 2014 Taylor & Francis Group, London.

关键词： Piles

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A soil model considering principal stress rotations

A soil model considering principal stress rotations

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

作者： Yang, Yunming Wang, Zhe Yu, Hai-Sui Department of Civil Engineering University of Nottingham Ningbo United Kingdom Nottingham Centre for Geomechanics University of Nottingham United Kingdom

ISBN: (纸本)9781138026889

this paper presents an elastoplastic soil model considering the principal stress rotation (PSR). the model is developed on the basis of a well-established kinematic hardening soil model using the bounding surface *** impact of the stress rate generating the PSR is treated independently, and is added to the base kinematic hardening model. the significance of independent treatment of the PSR stress rate in the soil model is demonstrated through comparing the simulations of soil stress-strain responses by using the base soil model and the modified model in the paper. Various test results in different sands under both drained and undrained conditions are simulated. the paper also discusses the simulations of sand responses under multiple PSRs. © 2014 Taylor & Francis Group, London.

关键词： Soils

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