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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691-700 订阅

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Identification and quantification of the mechanical response of soil-wall structures in soft ground improvement

引用

7th european conference on numerical methods in geotechnical engineering, NUMGE 2010

作者： Liu, X. Zhao, Y. Scarpas, A. De Bondt, Arian Section of Structural Mechanics Faculty of Civil Engineering and Geosciences Delft University of Technology Delft Netherlands Ooms Avenhorn Holding Bv Scharwoude Netherlands

ISBN: (纸本)9780415592390

the extensive surface deposits of clay/peat in the Netherlands cause difficulties in the field of construction and maintenance of infrastructure. One of the main concerns is long term settlement due to the high compressibility and low strength of the soil. Of the various available vertical reinforcing techniques for in-situ ground improvement, reinforcing elements using cast-in piles/walls have received increasing popularity in the recent past. In this investigation, by means of 3D non-linear finite element analyses, the interaction of the components of pavement/soil-wall structures on soft soils and the internal mechanisms that lead to damage have been addressed. the emphasis is placed not on the manifestations of damage but on the actual causes. © 2010 Taylor & Francis Group, London.

关键词： Finite element method

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A simple time stepping algorithm for Material Point Method

引用

7th european conference on numerical methods in geotechnical engineering, NUMGE 2010

作者： Solowski, Wojciech T. Sheng, Daichao University of Newcastle NSW Australia

ISBN: (纸本)9780415592390

the Material Point Method (MPM) is an emerging numerical method that provides a natural solution to dynamic problems involving large deformation and contact/impact. However, the method can be prohibitively time consuming because extremely small time steps often have to be used to obtain a reliable solution. the paper presents an adaptive time stepping algorithm with error control for the material point method. the proposed approach is based on an error estimate derived from the global energy. this error estimate is then used to control the time step size. the proposed algorithm is validated for a 1D dynamic problem involving impact of two elastic bars. the proposed time stepping algorithm seems to be able to recover the correct solution with arbitrary step sizes specified by the user. As such, it is hoped that the proposed algorithm may offer a way to overcome some of the shortcomings of the MPM. A conceptually similar algorithm may be used for 2D & 3D problems with more advanced boundary conditions and material models. © 2010 Taylor & Francis Group, London.

关键词： numerical methods

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A comparison between numerical integration algorithms for unsaturated soils constitutive models

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7th european conference on numerical methods in geotechnical engineering, NUMGE 2010

作者： Cattaneo, F. Della Vecchia, G. Jommi, C. Maffioli, G. Università Degli Studi di Brescia Brescia Italy Politecnico di Torino Torino Italy Politecnico di Milano Milano Italy

ISBN: (纸本)9780415592390

Constitutive models for soils in unsaturated conditions must account for the role of suction on the response of the volume element. Different constitutive formulations have been proposed to this aim in the recent past by different authors. Focusing the attention on elastic-plastic models with generalised hardening, a comparison between classical numerical algorithms, which can be adopted for the numerical integration of the soil skeleton constitutive law, is discussed.A refined Runge-Kutta-Dormand-Prince explicit formula and a fully implicit algorithm are compared one to the other in terms of convergence order and computational cost, on a typical stress path dependent on both strain and suction variations. Results are shown with specific reference to the axis-symmetric formulation of an elastic-plastic constitutive model, in which mixed isotropic and rotational hardening is ruled by volumetric plastic strain and degree of saturation. Iso-errors maps are presented to evaluate the performance of the implicit algorithm. © 2010 Taylor & Francis Group, London.

关键词： Constitutive models

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Comparison of calculation approaches for monopiles for offshore wind turbines

引用

7th european conference on numerical methods in geotechnical engineering, NUMGE 2010

作者： Augustesen, A.H. Sørensen, S.P.H. Ibsen, L.B. Andersen, L. Møller, M. Brødbæk, K.T. COWI A/S Aalborg Denmark Department of Civil Engineering Aalborg University Aalborg Denmark COWI A/S Århus/Aalborg Denmark

ISBN: (纸本)9780415592390

Large-diameter (4 to 6m) monopiles are often used as foundations for offshore wind turbines. the monopiles are subjected to large horizontal forces and overturning moments and they are traditionally designed based on the p-y curve method (Winkler type approach). the p-y curves recommended in offshore design regulations were developed for piles with diameters up to approximately 2.0m and are based on a very limited number of tests. Hence, the method has not been validated for piles with diameters of 4 to 6 m. this paper aims to assess different calculation approaches for monopiles subjected to quasi-static loading. the methods are: 1) a traditional Winkler model as recommended in the offshore standards;2) a modified Winkler model in which the initial stiffness of the p-y curves depends on the pile diameter, depth below mudline as well as the internal angle of friction;3) a three-dimensional continuum model established by means of the commercial program FLAC3D. the approaches are compared based on a monopile used as foundation for a wind turbine at Horns Rev which is located in the North Sea west of Denmark. © 2010 Taylor & Francis Group, London.

关键词： Piles

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A back analysis of vertical load tests on bored piles in granular soil

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7th european conference on numerical methods in geotechnical engineering, NUMGE 2010

作者： Tosini, L. Cividini, A. Gioda, G. Politecnico di Milano Department of Structural Engineering Milan Italy

ISBN: (纸本)9780415592390

Two back analyses are discussed of load tests carried out on bentonite slurry piles bored in granular soils. the first case concerns a test on a pile belonging to a 12 pile group. the back analysis permits calibrating an axisymmetric finite element model that reproduces, with reasonable accuracy, the experimental results. the calibrated model is then extended to three-dimensional conditions and applied to the analysis of the entire group. the results suggest some comments on the different assumptions that can be adopted in the calculations and on their effects on the global load-settlement curve of the pile group. the second case concerns a load test in which, in addition to the load-settlement data, also the axial strains along the pile were measured through electrical extensometers. the numerical back analyses highlight an apparent contradiction between the two sets of experimental data. On their bases some conclusions are drawn on the possible causes of the observed inconsistency and on the influence of the construction technology on the soil-pile interaction. © 2010 Taylor & Francis Group, London.

关键词： Piles

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the upper bound limit analysis of bearing capacity problems using the finite element method

引用

7th european conference on numerical methods in geotechnical engineering, NUMGE 2010

作者： Al-Janabi, A.I.M. Orabi, A.A.R. Baqir, A.Y.A. Civil Engineering Department Al-Tahadi University Sirt Libya University of Nebraska-Lincoln NE United States

ISBN: (纸本)9780415592390

In the present study, the upper bound limit analysis theorem of plasticity is applied to plane strain bearing capacity problems for soils under external load with or without self-weight loads. In deriving the upper bound formulation, a continuous velocity field is assumed and the soil is idealized as a rigid-perfectly plastic material obeying the nonlinear Mohr-Coulomb yield criterion with the associated flow rule. As a powerful solution technique, the finite element method is used to discretize the problem domain and a suitable optimization algorithm is used to solve the resulting constrained nonlinear optimization problem to obtain the limit load and the corresponding collapse mechanisms. numerical solutions for selected case studies showed that the proposed method of analysis which combines the upper bound limit analysis with the finite element method can be efficiently used for predicting the limit load for various bearing capacity problems. © 2010 Taylor & Francis Group, London.

关键词： Bearing capacity

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numerical modelling of spatial passive earth pressure in sand

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7th european conference on numerical methods in geotechnical engineering, NUMGE 2010

作者： Achmus, M. Ghassoun, S. Abdel-Rahman, K. Institute of Soil Mechanics Foundation Engineering and Waterpower Engineering Leibniz University of Hannover Hannover Germany

ISBN: (纸本)9780415592390

the calculation of earth pressures acting on underground structures is a central problem in soil mechanics. In special cases spatial earth pressure problems also have to be considered. In order to investigate the spatial passive earth pressure acting on rigid walls in sand, numerical simulations with the finite element method (FEM) were carried out. A hypoplastic material law was adopted to account for the complex stress-strain behaviour of sand. Different wall geometries with varying spatiality ratios (breadth to height) and different deformation modes of the rigid wall were considered. the results show a high dependency of the earth pressure coefficients on the wall spatiality ratio. For a smooth wall, a good agreement with the approach of the German standard DIN 4085 is obtained. the wall displacement necessary to reach the maximum earth pressure is also dependent on the wall geometry, with the displacement decreasing with increasing spatiality ratio. the analysis of the earth pressure distributions shows that the earth pressure increase due to spatiality occurs almost only in the lower half of the wall. © 2010 Taylor & Francis Group, London.

关键词： Underground structures

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Analysis of an excavation in asymmetrical soil conditions: the Marquês station

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7th european conference on numerical methods in geotechnical engineering, NUMGE 2010

作者： Pedro, A. Almeida E Sousa, J. Taborda, D. França, P. Department of Civil Engineering University of Coimbra Portugal Department of Civil and Environmental Engineering Imperial College London United Kingdom CJC Figueiredo Ferraz São Paulo Brazil

ISBN: (纸本)9780415592390

the Marquês station belongs to line D of the Oporto Metro, Portugal. the main access to the station platforms consists of an elliptical shaft of approximately 48m and 40m in the principal directions, reaching a depth of 27 m. the performed geotechnical survey revealed asymmetrical soil conditions, due to the existence of a fault. thus, on one side of the fault, the excavation was carried out in weathered residual granitic soil, while on the other half the works were performed in a slightly weathered granitic rock mass. the monitoring results showed a great difference in the displacements measured on the two sides. this paper presents a 3Dfinite element back-analysis of the shaft, modelling the complexity of its geology and the entire construction sequence. A parametric study will also be presented in order to evaluate the influence of the support system and the geological conditions on the behaviour of the structure. © 2010 Taylor & Francis Group, London.

关键词： Excavation

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A numerical study on the effects of time on the axial load capacity of piles in soft clays

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7th european conference on numerical methods in geotechnical engineering, NUMGE 2010

作者： Giannopoulos, K.P. Zdravkovic, L. Potts, D.M. Imperial College London United Kingdom

ISBN: (纸本)9780415592390

this paper investigates the axial load capacity of a pre-loaded pile installed in soft clay and subjected to vertical loading. Previous studies on pre-loaded shallow footings have shown that the undrained shear strength of soft clays is enhanced with time due to the dissipation of the excess pore water pressures generated during initial loading, as well as due to the soil ageing, after all pore pressures have dissipated, associated with creep. It remains a question whether the pile load capacity is enhanced with time as well, after the effects of installation have settled. the problem is investigated by means of a series of coupled finite element analyses, thus taking account of consolidation processes in the ground, in which the soil is modelled using an elastic-plastic constitutive model. Subsequently a similar set of coupled analyses is performed, using an elastic-viscoplastic model, to examine the effect of creep on pile capacity. © 2010 Taylor & Francis Group, London.

关键词： Creep

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A numerical model for the electrokinetic treatment of natural soils with calcite

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7th european conference on numerical methods in geotechnical engineering, NUMGE 2010

作者： Cattaneo, F. Jommi, C. Musso, G. Università Degli Studi di Brescia Brescia Italy Politecnico di Milano Milano Italy Politecnico di Torino Torino Italy

ISBN: (纸本)9780415592390

To the aim of verifying the feasibility of electrokinetic remediation, a laboratory investigation is being performed on samples of natural clayey soils. the experimental data collected highlighted sharp changes of pH, reduction of soil electrical conductivity, and fracturing close to the anode, which were interpreted as consequences of arising severe CO2 pressures in the anode area accompanying calcite dissolution. A model for the analysis of the coupled electro-chemo-hydraulic processes, taking place during electrokinetic treatments of natural soils, is presented. the numerical model accounts for relevant processes, which are not adequately taken into account by existing models, namely gas generation and transport, and chemical equilibrium of calcite at varying pH. the implementation of the theoretical model in a FE code allows for analysing the evolution of the local constraint conditions imposed to the chemical system, and to model the transient response of the soil subjected to electrokinetic treatments. the results of the numerical simulation of a one-dimensional filtration test are presented and compared with selected experimental data coming from the laboratory investigation. © 2010 Taylor & Francis Group, London.

关键词： numerical models

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