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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701-710 订阅

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Modelling of installation effects of driven piles using hypoplasticity

引用

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

作者： Pham, H.D. Engin, H.K. Brinkgreve, R.B.J. Van Tol, A.F. Geo-Engineering Section Delft University of Technology Delft Netherlands Plaxis B.V. Delft Netherlands Deltares Delft Netherlands

ISBN: (纸本)9780415592390

It is previously shown that driven piles can be modelled using regular FEA by introducing volumetric expansion or applying displacement or stress fields at pile shaft and tip in order to capture initial stresses near pile. In this paper, these techniques are employed to model piles driven in sand using Plaxis 2D software. the hypoplastic model with intergranular strain is a powerful constitutive model for granular material as the stress-strain relationship is mainly dictated by limiting and critical void ratios that follow the same compression law. the small strain performance of the extended hypoplasticity is improved by the intergranular strain concept. In this study, the hypoplastic model with intergranular strain is chosen as the constitutive relation. the results are compared with previous experimental results and FE simulations. Lastly, a simplified FE model is used to investigate cyclic loading effects on void ratio and stresses near the shaft. © 2010 Taylor & Francis Group, London.

关键词： Piles

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A method to solve Biot's u-U formulation for soil dynamics applications using the ABAQUS/explicit platform

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

作者： Ye, F.J. Goh, S.H. Lee, F.H. Department of Civil Engineering National University of Singapore Singapore Singapore

ISBN: (纸本)9780415592390

this paper describes a numerical method for solving the coupled equations resulting from Biot's u-U formulation for waves propagating in a saturated porous medium. the proposed ABAQUS Dual Phase Coupling (ADPC) method is implemented in the explicit solver module of the general purpose finite element program ABAQUS. this method features two overlapping meshes representing the fluid and solid phases of the saturated medium respectively. Interactions between the two phases occur via dashpots connecting the two meshes, and also by the use of user-defined material subroutines. In this way, the coupling effects arising from complex dual-phase interaction can be incorporated into the analysis. In this paper, theADPCmethod is restricted to linear material behavior of both the solid and fluid phases. Preliminary validation of the proposed method is carried out using a one-dimensional problem. the good agreement between the ADPC results and published analytical/numerical solutions suggests that the proposed method provides a feasible, alternative approach for studying dynamics problems involving wave propagation in saturated soil media. © 2010 Taylor & Francis Group, London.

关键词： ABAQUS

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Inverse modelling including spatial variability applied to the construction of a road embankment

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

作者： Hommels, A. Molenkamp, F. Huber, M. Vermeer, P.A. Delft University of Technology Delft Netherlands Institute of Geotechnical Engineering University of Stuttgart Germany

ISBN: (纸本)9780415592390

Almost all natural soils are highly variable in their properties and rarely homogeneous. there is a natural variation of soil properties from one point to another in space due to different deposition conditions and different loading conditions. this is called spatial heterogeneity and can be modeled using the Random Finite Element Method. To improve model predictions an inverse modeling technique can be implemented to incorporate measurements into a deterministic model. this enables the improvement of the poorly known parameters and consequently the model results. this allows for observations of on-going processes to be used for enhancing the quality of subsequent model predictions based on improved knowledge of the soil parameters. the Ensemble Kalman filter calculates an assimilated state each time measurements become available, using these measurements and the model predictions for that time step including both the measurement and its possible error range. In this way the uncertain parameters are improved. the combination of the Ensemble Kalman filter and the Random Finite Element method is a very powerful instrument to address the uncertainty of soil parameters and in this way improve the model prediction. © 2010 Taylor & Francis Group, London.

关键词： Finite element method

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Analysis of the effect of pile length in a pile group on the transfer and impedance functions in soil-pile interaction models

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

作者： Mahboubi, A. Panaghi, K. Power and Water University of Technology Tehran Iran Department of Civil Engineering Power and Water University of Technology Tehran Iran

ISBN: (纸本)9780415592390

Numerous works is done to account for deterministic parameters effects on the seismic soil-pile interaction *** consider soil nonlinearity, one has to consider thewhole system of soil-pile-structure in analyses with no effectual simplification. this approach, however, can lead to cumbersome calculations. Despite its effect on the degree of accuracy of the results, the soil-pile interaction problems can be considered with linear or slightly nonlinear behavior in soil. this methodology allows for the use of superposition law in the studies. Adopting this approach, this study considered the soil-pile interaction phenomenon as kinematic and inertial interactions. Pile groups of 2×2 with pile lengths of 16, 20 and 25mwere used in analyses. the piles had circular cross sections with the diameter of 1m. Separation between pile and the surrounding soil was allowed in the models developed by the software ABAQUS. Finally the results are presented and discussed in detail. © 2010 Taylor & Francis Group, London.

关键词： Piles

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Settlement analysis of a large piled raft foundation

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

作者： Wehnert, M. Benz, T. Gollub, P. Cubaleski, T. Wechselwirkung - Numerische Geotechnik GmbH Stuttgart Germany Norwegian University of Science and Technology Trondheim Norway BAUER Spezialtiefbau GmbH Schrobenhausen Germany E.ON Engineering GmbH Gelsenkirchen Germany

ISBN: (纸本)9780415592390

this paper presents a settlement analysis of a large piled raft foundation. Total raft area is about 12,600m2. the raft investigated is a monolithic raft supported by more than 500 large diameter bored piles. Due to problem size, all bored piles are discretized with embedded elements. Analyses taking into account the full soil-structure interface between soil and pile are conducted for smaller pile groups and single piles: First, load tests on single piles are back calculated. then, a small pile group is analyzed. From this, the element size in the 3D analysis of the complete raft is determined so that the embedded element approach yields reasonable results in the service load range. the analysis aims mainly for an estimate of differential settlements and quantification of load distribution between raft and piles. © 2010 Taylor & Francis Group, London.

关键词： Piles

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Finite difference analysis of pile on sloping ground under passive loading

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

作者： Muthukkumaran, K. Gokul Khrishnan, M. Department of Civil Engineering National Institute of Technology Tiruchirappalli Tamilnadu India

ISBN: (纸本)9780415592390

Pile foundations are slender structural elements used to transfer loads from structures into deep hard strata below the ground level. It is time consuming and expensive to carry out field test over the piles in larger lengths. Computer simulations of Finite Element/Finite Difference Modelling will allow for in depth studies to analyze the pile - soil interaction of laterally loaded piles on sloping ground under passive loading. this paper presents a three dimensional finite difference analysis for the lateral response of pile located at the crest of slopes under passive loading: 0 degrees, 33 degrees 40 min, 26 degrees 33 min. with relative densities: 30%, 45%, and 70%. Soil stratum is represented elastic-plastic Mohr Coulomb model. FDA and Model test results are compared and analyzed. Conclusions are drawn regarding application of the analytical method to study the effect of slope on laterally loaded pile. © 2010 Taylor & Francis Group, London.

关键词： Piles

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A numerical simulation on centrifuge liquefaction model using microscopic fluid coupling scheme with Discrete Element Method

引用

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

作者： Shimizu, Y. Inagawa, Y. Department Marine Mineral Resources Faculty of Marine Science and Technology Tokai University Shizuoka Japan Department Geotechnical Engineering Technical Research Institute of Obayashi Co. Tokyo Japan

ISBN: (纸本)9780415592390

A numerical study is conducted to simulate liquefaction using a microscopic fluid coupling scheme with the two-dimensional Discrete Element Method. the scheme creates triangular fluid grids in a particle assembly by connecting each particle volumetric center between the nearest three particles. they represent void spaces in the particle assembly under saturated condition. the scheme solves pore pressure in each void space and fluid flow across them by considering compressibility of fluid caused by particle movement. On the other hand, pore pressure is applied to particles involved in each fluid grid as a form of body force in proportional to occupied area of each particle in void space. numerical simulations modeling a centrifuge experiment are conducted. In the centrifuge model experiment, the sand assembly in a rectangular box is excited by sinusoidal acceleration under loading centrifugal force, which is thirty times larger than the gravity acceleration. the numerical results are compared with those of the experiment. As a result, it was clarified that the scheme represents transient of localized pore pressure and effective stress under dynamic acceleration in saturated particle assemblies, also the results are in good agreement with those of the centrifuge model experiment. © 2010 Taylor & Francis Group, London.

关键词： Pore pressure

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numerical modeling of the mechanical response of recycled materials in embankments

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

作者： Villani, M.M. Liu, X. Scarpas, A. D'Andrea, A. Section of Structural Mechanics Faculty of Civil Engineering and Geosciences Delft University of Technology Netherlands Department of Hydraulic Transport and Roads Sapienza University of Rome Italy

ISBN: (纸本)9780415592390

Every year, in Europe, 3 billion tonnes of aggregates are required for construction applications and, at the same time, 1.3 billion tonnes of waste are disposed of. the idea of using some of them as new alternative materials could be economically beneficial but several studies have to be done in order to guarantee their bearing capacity and durability. In this study three waste products, clay and lime, pozzolan, sludge and lime and construction and demolition wastes, were selected in order to use them as new alternative materials for embankment construction. On the basis of the information obtained from laboratory and in situ tests, the embankment was simulated by means of the finite element method. Comparisons have been made between in situ and modeled results by considering material stress dependence and surface deflection profiles. Modeling with the finite element system CAPA-3D has shown good agreement with in situ response. the results indicate that stabilized materials can be characterized by a hyperelastic assumption while unbound materials can be appropriately modeled by using a Mr-θ model. © 2010 Taylor & Francis Group, London.

关键词： Embankments

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A new elasto-plastic spring element for cyclic loading of piles using the p-y-curve concept

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

作者： Hededal, Ole Klinkvort, Rasmus Department of Civil Engineering Technical University of Denmark Denmark

ISBN: (纸本)9780415592390

Modeling the response of large diameter piles subjected to lateral loading is most often done by means of p-y-curves in combination with Winkler beam models. Traditionally the p-y curves are formulated as non-linear (elastic) relations between the lateral movement y and the soil response pressure p in terms of monotonic loading (until failure) as e.g. prescribed by API (2000). However, the cyclic and dynamic performance is only to a limited degree accounted for. Here the elasto-plastic framework is applied allowing definition of unloading-reloading branches, hence enabling modeling of cyclic response. the present model can account for effects like pre-consolidation and creation of gaps between pile and soil at reversed loading. Results indicate that the model is able to capture hysteresis during loading with full cycles and model the accumulated displacement observed on piles subjected to "half cycles" as e.g. seen from centrifuge tests carried out. this article presents the theoretical formulations, discusses numerical implementation and finally presents simulations. © 2010 Taylor & Francis Group, London.

关键词： Piles

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numerical integration and analysis of equilibrium in unsaturated multiphase media

引用

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

作者： Tamagnini, R. Mavroulidou, M. Gunn, M.J. Department of Engineering Systems London South Bank University United Kingdom

ISBN: (纸本)9780415592390

Unsaturated soil mechanics has been largely focused on the phenomena of collapse upon wetting. Since the early studies this mechanical feature has influenced the way of representing experimental data and the constitutive modelling. Collapse has been generally modelled with a plastic amount of strains coupled with the suction rate. this constitutive approach is discussed. In the paper, the equilibrium and stability of the granular matrix is studied applying the criteria of thermodynamics. the system is considered as an open continua and the filtration of the wetting phase during collapse is taken into account. the paper provides some remarks about the hardening in partially saturated conditions. the incremental constitutive system of equations is implicitly integrated adopting the Laplace transform and the Newton Raphson technique. this allows defining the problem in the domain of a physical quantity that can be measured in laboratory tests (namely the degree of saturation). Time evolution of the capillary stress is obtained with the inverse transformation. the proposed integration is a part of the research program on lime stabilized material in partially saturated condition. the integration for the partially saturated model is described in the present paper. © 2010 Taylor & Francis Group, London.

关键词： Lime

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