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检索条件"任意字段=7th European Conference on Numerical Methods in Geotechnical Engineering, NUMGE 2010"

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Comparison of different liquefaction assessment methods with data from the 2010-2011 canterbury earthquake sequence 7th

Comparison of different liquefaction assessment methods with...

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7th International conference on Earthquake geotechnical engineering, ICEGE 2019

作者： Bertelli, S. Lopez-Querol, S. Rossetto, T. Giovinazzi, S. Wotherspoon, L. Ruiter, R. Department of Civil Environmental and Geomatic Engineering University College London London United Kingdom Department of Civil and Natural Resources Engineering University of Canterbury Christchurch New Zealand Department of Civil and Environmental Engineering The University of Auckland Auckland New Zealand Chorus Christchurch New Zealand

ISBN: (纸本)9780367143282

Soil liquefaction has caused substantial infrastructure damage in recent earthquakes. For instance, during the 2010-2011 Canterbury Earthquake Sequence (CES), in New Zealand, liquefaction-induced damage to buried cables resulted in service interruption of the telecommunication network. Being part of a broader investigation of the seismic risk of buried infrastructure, this paper aims to investigatethe geotechnical data collected after the CES. First, using geotechnical information published in the New Zealand geotechnical database (NZGD), a comparison between several semi-empirical liquefaction triggering assessment methods available in the literature is carried. then, using a FLAC software, different soil profiles are analysed adopting the Martin et al. (1975) constitutive model for the sandy soil behaviour, which takes into account the accumulated volumetric strains with the cyclic loading. Finally, the numerical simulation results are compared with the ones obtained from the empirical analysis, the existing liquefaction investigations maps and field observations collected in the aftermath of the sequence. © 2019 Associazione Geotecnica Italiana, Rome, Italy.

关键词： Soil liquefaction

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numerical study on mitigation of liquefaction induced uplift of underground structure 7th

Numerical study on mitigation of liquefaction induced uplift...

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7th International conference on Earthquake geotechnical engineering, ICEGE 2019

作者： Sudevan, P.B. Boominathan, A. Banerjee, S. Indian Institute of Technology Madras ChennaiTamil Nadu India

ISBN: (纸本)9780367143282

Underground structures buried within liquefiable soil are often likely to get uplifted during an earthquake due to its relatively low unit weight and shallow burial depth. therefore, there exists a need to come up with a mitigation technique to prevent the uplift of these underground structure, which could be easily applied in field. In this study, uplift mitigation of the underground structure by accelerating the pore pressure dissipation from the vicinity of the structure by replacement with more permeable sand is numerically studied using a finite difference program, FLAC3D. the response of a 5 m diameter structure which is buried at a depth of 1.1 times the diameter of the structure from the surface is studied. For this the whole soil model is subjected to 2010 Chile Earthquake. the cyclic behavior of the soil represented by FINN-model in which the pore pressure generated is measured from the volumetric strain induced by the ground motion. the effectiveness of the above mentioned methods are highlighted and are compared in term of pore pressure around the structure and the maximum uplift observed. © 2019 Associazione Geotecnica Italiana, Rome, Italy.

关键词： Soils

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A numerical study on tunnel-building interaction in liquefiable soil 7th

A numerical study on tunnel-building interaction in liquefia...

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7th International conference on Earthquake geotechnical engineering, ICEGE 2019

作者： Maddaluno, L. Stanzione, C. Nappa, V. Bilotta, E. University of Napoli Federico II Naples Italy

ISBN: (纸本)9780367143282

this paper shows the results of the preliminary numerical analyses carried out for the project STILUS within the framework of the european funded network SERA (Seis-mology and Earthquake engineering Research Infrastructure Alliance for Europe). the aim of the project is to investigate the problem of tunnel-structure interaction in liquefiable soil through a series of centrifuge tests and to assess an effective mitigation technique. A preliminary numerical study was carried out in Plaxis 2D software. the soil was characterized by UBCSAND model implemented in the Plaxis code. the input parameters for the models are evaluated on the basis of laboratory element tests. numerical analyses were also performed to evaluate the efficacy of drains as mitigation techniques. Drains were installed in the models, in order to analyse their effectiveness in reducing the pore pressure build up and then the tunnel uplift and building movements as a function of their spacing, length and position. © 2019 Associazione Geotecnica Italiana, Rome, Italy.

关键词： geotechnical engineering

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numerical analysis of a foundation of a cooling tower in difficult geotechnical conditions 9th

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

作者： Bogusz, W. Kociniak, M. Inst Tech Budowlanej Warsaw Poland BEROA Deutschland GmbH Ratingen Germany

ISBN: (纸本)9780429446924;9781138332034

Eurocode 7 offers general guidance on design of different foundation types and recognizes that foundations cannot be always considered in isolation from the structure. When a significant potential for stress redistribution exists, the exceedance of geotechnical ultimate limit state may become highly unlikely. However, it is often the geotechnical serviceability that guides the design as it may lead to a structural failure. the paper presents a case study with the results of a numerical analysis performed for a cooling tower of a conventional power plant, located in an area characterized by difficult geotechnical conditions. Firstly, a prediction of the settlement distribution has been conducted to assess the serviceability limit state and the behavior of the foundation. then, a detailed distribution of moduli of subgrade reaction has been proposed for structural analysis. the measurements of vertical displacements of the foundation, conducted during the construction, validated the assumptions of the design.

关键词： Fracture mechanics

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Consideration of numerical methods in next generation Eurocode 7 (EN 1997)-current state of the amendment 9th

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

作者： Lees, A. S. Walter, H. Tensar Int Nicosia Cyprus Geofem Ltd Nicosia Cyprus HTLuVA Salzburg Salzburg Austria

ISBN: (纸本)9780429446924;9781138332034

According to Mandate 515 of the european Commission "Mandate for amending existing Eurocodes and extending the scope of structural Eurocodes" and the response of CEN/TC250 "Towards a second generation of EN Eurocodes" Eurocode 7 should be extended, among other issues, to cover numerical methods in more detail. Among the tasks listed are: "Establish clear rules for using advanced numerical methods in day-to-day practice for inclusion in EN 1997-1. Such rules have been regularly sought during stakeholder feedback. this work would make use of the background research being undertaken by SC7/EG4. (...)" Currently the first part of EN 1997, EN 1997-1, is being redrafted. It will contain general aspects of geotechnical design, including sections about "Basis of geotechnical design", "geotechnical Analysis", "Ultimate limit states" etc. the third and, expected to be, final draft will be available in May 2018. this paper gives an overview over the goals of the updated version of EN 1997 and the steps and organisation of its development. the section "geotechnical analysis" - with focus on the subsection "numerical methods" - will be presented in more detail. For the verification of ultimate limit states a dual factoring approach will be recommended, requiring two analyses with different combinations of partial safety factors. Among other recommendations, the need for validation of the models will be highlighted with the recommended level of validation depending on the geotechnical category. the updated EN 1997-1 will be open to reliabilitybased analyses.

关键词： numerical methods

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Dynamic analysis of artifacts: Experimental tests for the validation of numerical models 7

Dynamic analysis of artifacts: Experimental tests for the va...

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7th International conference on Computational methods in Structural Dynamics and Earthquake engineering, COMPDYN 2019

作者： Tanganelli, M. Cimellaro, G.P. Marasco, S. Cardoni, A. Zamani Noori, A. Coli, M. Viti, S. Department of Architecture University of Florence via della Mattonaia 14 Firenze50121 Italy Department of Structural Geotechnical and Building Engineering Politecnico di Torino Corso Duca degli Abruzzi 24 Turin10129 Italy Department of Earth Science University of Florence via G. La Pira 4 Firenze50121 Italy

ISBN: (纸本)9786188284470

the protection of art goods is an important issue of the seismic engineering. Artifacts are often made by fragile and ancient material, and they can easily present irregular shapes and high slenderness. In these years many contributions have been devoted to their analysis, based on numerical models having different complexity and computational effort. the Finite Element Models represent the most common and versatile approach for the representation of artifacts. Nevertheless, their reliability depends on the numerical assumptions made for the analysis, which requires a wide number of information regarding the dynamic behavior of the artifacts, such as the friction between the analyzed object and its support, the effective damping, the inelastic involvement of material, etc. In this work an experimental campaign has been started aimed at determining the main factors which affect the dynamic representation of artifacts through FEM analysis and simplified models. A large number of experimental tests, both static and dynamic, have been performed, by adopting both real and reduced scale objects. © 2019 the authors.

关键词： Earthquake engineering

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numerical simulation of the behavior of collapsible loess 9th

Numerical simulation of the behavior of collapsible loess

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

作者： Schiava, R. National University of Santiago del Estero Argentina

ISBN: (纸本)9781138544468

the behavior of partially saturated soils is determined by the characteristics of their macro porous structure. the matrix suction is an additional fundamental variable in its response to deformation under variable moisture conditions. In the northwest of Argentina, there are deposits of loess of predominantly Aeolian origin and some of them have collapsible characteristics. the aim of the study is propose solutions to the geotechnical problems that affect these types of soils. this work shows the numerical implementation of a flow-mechanical coupled model. the extended MRS-Lade elastoplastic constitutive model was applied. Finally, numerical simulations were performed to reproduce the behavior of this unsaturated loess under conditions of infiltration and variable levels of load, after the calibration of the parameters of the model through experimental tests. © 2018 Taylor & Francis Group, London.

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

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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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the role of soil fabric anisotropy for reaching and maintaining critical state 9th

The role of soil fabric anisotropy for reaching and maintain...

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

作者： theocharis, A.I. Vairaktaris, E. Dafalias, Y.F. Papadimitriou, A.G. Department of Mechanics National Technical University of Athens Athens Greece Department of Civil and Environmental Engineering University of California Davis DavisCA United States Department of Geotechnical Engineering National Technical University of Athens Athens Greece

ISBN: (纸本)9781138544468

According to Critical State theory (CST) for granular media, two conditions on the stress ratio and void ratio are considered to be necessary and sufficient for reaching and maintaining the critical state (CS). A two-dimensional discrete element method experiment questions whether these two conditions, that do not consider soil fabric, are sufficient for CS. For this purpose, a virtual sample is first brought to CS and then rotation of the stress principal axes is imposed while keeping stress principal values fixed, hence maintaining the satisfaction of the aforementioned two CST conditions. the rotation induces a void ratio reduction and thus, abandonment of CS, proving incompleteness of classical CST. the recently proposed Anisotropic Critical State theory (ACST) remedies this incompleteness by enhancing the two foregoing conditions by a third, related to the critical state value of a fabric anisotropy variable. the ACST can also explain various other soil response characteristics that cannot be addressed by classical CST with no fabric anisotropy consideration, as depicted by simulations performed with a constitutive model developed within ACST. © 2018 Taylor & Francis Group, London.

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numerical methods in geotechnical engineering : proceedings of the 8th european conference on Numeri

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2014年

作者： european conference on numerical methods in geotechnical engineering

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