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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131-140 订阅

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Experimental validation of a 3D FEM numerical model for railway vibrations 9th

引用

9th european conference on numerical methods in geotechnical engineering (NUMGE)

作者： Fernandez Ruiz, J. Alves Costa, P. Univ A Coruna La Coruna Spain Univ Porto Porto Portugal

ISBN: (纸本)9780429446924;9781138332034

In this paper a three dimensional numerical model formulated in time/space domain is applied for railway vibrations. the model is developed in code PLAXIS which is used to simulate the wave propagation in the ground whilst the train loads are calculated with a 2D train-track interaction model. the main objective is to show that commercial programs such as PLAXIS are reliable tools to model railway vibrations. Furthermore, since the wave propagation model is formulated in the time domain and PLAXIS software is able to model excess pore pressure and nonlinear soil behaviour, it could also be a useful tool to consider these two effects, which may be relevant in some cases. A real case located in Portugal is presented, being used for the experimental validation. the numerical results show an acceptable agreement with real measurements. therefore, the proposed numerical approach can be used as a reliable prediction tool based on PLAXIS software.

关键词： numerical models

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numerical method for evaluation of excess pore pressure build-up at cyclically loaded offshore foundations 9th

引用

9th european conference on numerical methods in geotechnical engineering (NUMGE)

作者： Achmus, Martin Saathoff, Jann-Eike thieken, Klaus Leibniz Univ Hannover Hannover Germany Achmus CRP Planungsgesell Grundbau mbH Berlin Germany

ISBN: (纸本)9780429446924;9781138332034

In particular during storm events, a build-up of excess pore pressures may occur in the soil around cyclically loaded offshore foundations. Such accumulated excess pore pressure reduces the effective stresses in the soil and hence negatively affects the structural integrity. Even though the consideration of this degradation effect on the bearing capacity is commonly demanded by the involved certification or approval bodies, no general applicable and accepted method for the calculative verification currently exists. the paper presents a novel approach which allows for the transfer of the soil behavior obtained in cyclic DSS tests to the bearing capacity of the foundation structure by means of a 3D numerical model. the respected transfer function enables the consideration of site-specific cyclic DSS test results by taking into account the mean stress, the cyclic shear stress amplitude and the number of load cycles at each integration point of the numerical model. Hence, the numerical approach may contribute to the optimisation of common foundation solutions as well as to the verification of innovative foundation structures even in complex soil conditions.

关键词： Bearing capacity

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On the use of NURBS plasticity for geomaterials 9th

On the use of NURBS plasticity for geomaterials

引用

9th european conference on numerical methods in geotechnical engineering, NUMGE 2018

作者： Coombs, W.M. Ghaffari Motlagh, Y. Department of Engineering Durham University Durham United Kingdom School of Chemical and Process Engineering University of Leeds Leeds United Kingdom

ISBN: (纸本)9781138544468

there are a huge number of plasticity models available in the literature to represent the behaviour of geomaterials and the majority include the concept of a yield surface which bounds the allowable stress in the material. However, each surface is distinct and requires a specific equation describing the shape of the surface to be formulated in each case. Recently Coombs et al. (2016) proposed a non-uniform rational basis spline (NURBS) plasticity framework where any isotropic yield surface can be represented and integrated using the same numerical algorithm. However, the NURBS plasticity framework is currently restricted the to case of associated plastic flow which will lead to an overly dilative response for most geomaterials. this paper extends the approach to include a non-associated plastic flow rule whilst guaranteeing the recovery of associated plastic flow if required. the algorithm’s performance is demonstrated at both material point (stress-strain) and boundary value problem levels. © 2018 Taylor & Francis Group, London.

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A robust numerical technique for analysis of coupled problems in elasto-plastic porous media 9th

A robust numerical technique for analysis of coupled problem...

引用

9th european conference on numerical methods in geotechnical engineering, NUMGE 2018

作者： Ghaffaripour, O. Khoshghalb, A. School of Civil and Environmental Engineering UNSW Sydney KensingtonNSW Australia

ISBN: (纸本)9781138544468

A robust numerical technique is presented for solution of coupled problems in saturated porous media with elasto-plastic behavior. the proposed method, called edge-based smoothed point interpolation method, is developed by application of the strain smoothing technique and the generalized smoothed Galerkin method to the governing equations of two phase porous media. Point interpolation shape functions are adopted for approximation of the independent variables in the problem domain. A novel approach for the evaluation of the coupling matrix of the porous media is adopted. Integration of the elasto-plastic constitutive model is performed using the substepping method, and the modified NewtonRaphson approach is utilized to address the global nonlinearities of the problem. the performance of the presented formulation is evaluated by studying two numerical examples and comparing the results of the analysis with analytical solutions and those obtained from the conventional finite element method. © 2018 Taylor & Francis Group, London.

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Two dimensional upper and lower-bound numerical analysis of the basal stability of deep excavations in clay 9th

引用

9th european conference on numerical methods in geotechnical engineering (NUMGE)

作者： Santana, T. Vicente da Silva, M. Antao, A. N. Guerra, N. C. Univ Nova Lisboa Dept Engn Civil UNIC Lisbon Portugal

ISBN: (纸本)9780429446924;9781138332034

the basal stability of deep excavations in clay is often analysed using the classical approaches of Terzaghi (1943) and Bjerrum & Eide (1956). Terzaghi's approach seems to be appropriate to excavation with small depth to width ratios, h/B, whereas Bjerrum & Eide give better results for greater h/B ratios. Not many attempts have been made to unify the two situations. In the present paper, the problem is analysed using upper and lower-bound considering two two-dimensional cases: a basic case, where the rigid stratum was considered deep, not affecting the stability of the excavation, and a case considering a rigid stratum at a certain depth. the embedded length of the wall was assumed null. A proposal for the stability numbers at failure is presented, for a wide range of h/B ratios.

关键词： Excavation

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numerical 3D analysis of masonry arch bridge cracks using jointed rock model 9th

引用

9th european conference on numerical methods in geotechnical engineering (NUMGE)

作者： Penzes, Balint Yeow, Hoe-Chian Harris, Peter Heap, Christopher COWI UK London England Network Rail London England

ISBN: (纸本)9780429446924;9781138332034

Historical masonry arch bridges are an elementary part of the european infrastructure landscape. However, due to increased loads and various changes in the use of these structures;their behavior under these changing conditions needs to be understood in order to ensure safety of the end users. Monitoring of the performance of such structures allows practitioners the opportunity to understand the soil-structure interaction in a more accurate way in order to simulate better their actual performance. this paper describes a 3D finite element model, which analyses the interaction of the masonry structure with its backfill, embankment and foundation. Jointed Rock model was used to model the anisotropic nature of the masonry, which allows the determination of more accurate stress and strain concentrations where cracks and discontinuities in the masonry structure occur. the modelling approach is described in the paper and the computed behavior is compared with a masonry arch bridge where measurements have been undertaken. the findings of this type of study can be used to confirm safety of any operational changes, plan future maintenance requirements and monitoring and repair regime of masonry arch bridges.

关键词： Repair

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Estimating spatial correlations from CPT data using neural networks and random fields 9th

Estimating spatial correlations from CPT data using neural n...

引用

9th european conference on numerical methods in geotechnical engineering, NUMGE 2018

作者： Nuttall, J.D. Department of Numerical Simulation Software Deltares Delft Netherlands

ISBN: (纸本)9781138544468

Vertical and horizontal scales of fluctuation are measures of spatial correlation and variability in soils, and as such are extensively used in the modelling of soils in reliability methods, such as the Random Finite Element Method (RFEM). these parameters are conventionally estimated from site surveys, commonly using Cone Penetration Test (CPT) data. By fitting theoretical correlation functions to the site data, the horizontal and vertical scales of fluctuation can be estimated. Presented is a new approach that trains a Convolution Neural Network (CNN) with pseudo CPT data taken from generated Random Field (RF) data with known scales of fluctuation. Once trained the network can predict these measures of spatial variability from real CPT data. this paper presents the results of a study training a network to predict vertical scales of fluctuation. © 2018 Taylor & Francis Group, London.

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numerical analyses of a pile wall at the toe of a natural slope 9th

引用

9th european conference on numerical methods in geotechnical engineering (NUMGE)

作者： Castro, J. Canizal, J. Da Costa, A. Miranda, M. Sagaseta, C. Casanueva, J. Univ Cantabria Santander Spain CMC Ingenieros Santander Spain

ISBN: (纸本)9780429446924;9781138332034

the construction of an industrial unit required a 10-meter-deep excavation at the toe of a steep natural slope with signs of previous instabilities. the adopted solution was a soldier pile wall with several levels of ground anchors. On the other hand, the upper natural slope was reinforced using horizontal drains, driven steel piles (rail segments) and ground anchors. Bolted steel meshes were also used to avoid shallow instabilities. Limit equilibrium and finite element analyses were performed for the design of those remediation measures. Finite element analyses provided useful information about bending moments in the piles and anchor forces. Detailed instrumentation, namely inclinometers, anchor load cells and topographical surveying, was used to monitor the performance of the wall and the slope. the field measurements were compared with the finite element predictions along all the construction period, showing a general good agreement.

关键词： Finite element method

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numerical modelling of vibration mitigation due to subway railway traffic 9th

引用

9th european conference on numerical methods in geotechnical engineering (NUMGE)

作者： Lopes, P. Alves Costa, P. Silva Cardoso, A. Calcada, R. Fernandez, J. Univ Porto Construct FEUP Porto Portugal Polytech Inst Porto ISEP Porto Portugal Univ A Coruna Campus Elvina La Coruna Spain

ISBN: (纸本)9780429446924;9781138332034

In the present paper a numerical study is presented in order to evaluate the efficiency of different countermeasures that can be adopted to mitigate vibrations inside buildings due to railway traffic in tunnels. the numerical model is substructured and is composed by three autonomous modules to simulate the main parts of the problem: i) generation of vibrations (train-track interaction);ii) propagation of vibrations (track-tunnel-ground system);iii) reception of vibrations (building coupled to the ground). A comparative analysis is carried out on the potential benefits of improving the geometrical quality of the track and of the installation of resilient elements under the railway slab, being evaluated the vibrations inside of a building due to railway traffic in a shallow tunnel located in Madrid. Finally, some considerations are made regarding an engineering solution that could involve the combination of several types of mitigation measures, taking advantage of the potentialities of the model.

关键词： numerical models

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numerical analysis of concrete piles driving in saturated dense and loose sand deposits 9th

引用

9th european conference on numerical methods in geotechnical engineering (NUMGE)

作者： Aghayarzadeh, M. Khabbaz, H. Fatahi, B. Univ Technol Sydney UTS Sydney NSW Australia

ISBN: (纸本)9780429446924;9781138332034

Many approaches and techniques are used to evaluate pile axial capacity ranging from static methods to dynamic methods, which are based on either the results of pile driving or numerical simulations, which require reliable constitutive models representing the real soil behaviour and the interaction between the pile and soil. In this paper, using PLAXIS software and different constitutive soil models including Mohr-Coulomb, Hardening Soil and Hypoplastic with Intergranular Strain models, the behaviour of concrete piles driven into saturated dense and loose sand deposits under a hammer blow is evaluated. the main objective of this study is to assess the influence of different factors including frequency of loading and Hypoplastic soil model parameters on the recorded velocity and pile head displacement. In addition, the concept of one-dimensional wave propagation induced by pile driving is discussed. It is indicated that using the Intergranular Strain concept, defined in Hypoplastic soil model, small strain behaviour of soil around the pile during driving can directly be captured. the results of this study reveals that considering the Hypoplastic model, incorporating the Intergranular Strain concept, can accumulate much less strains than the corresponding predictions excluding the Intergranular Strain, and hence predict the pile performance during driving more realistically.

关键词： Piles

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