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6th Italian conference of Researchers in geotechnical engineering (CNRIG) - geotechnical engineering in Multidisciplinary Research - From Microscale to Regional Scale

作者： Merli, Alessandro Capatti, Maria Chiara Dezi, Francesca Univ Politecn Marche DICEA Via Brecce Bianche 12 I-60131 Ancona Italy Univ San Marino DESD Salita Rocca 44 San Marino Citta 47890 San Marino

the determination of hydraulic conductivity is a relevant topic for the characterization of widely-extended sandy coastal deposits. In the present work, the hydraulic conductivity of the Rimini Northern coastal deposits is evaluated through different procedures. Hydraulic conductivity is estimated from in situ and laboratory tests on small soil volumes, and from empirical correlations based on particle size distribution and in-situ tests. Relying on the variability ranges of the estimated parameters, a preliminary numerical water flow model of the testing area has been developed. Results can be considered as predictive of the hydraulic behavior of large soil volumes in the investigated area. (C) 2016 the Authors. Published by Elsevier Ltd.

关键词： hydraulic conductivity coastal deposits permeability MODFLOW code

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numerical methods for the interpretation and exploitation of AE monitoring results 6th

Numerical methods for the interpretation and exploitation of...

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6th International conference on Emerging Technologies in Nondestructive Testing, ETNDT 2016

作者： Invernizzi, S. Lacidogna, G. Carpinteri, A. Department of Structural Geotechnical and Building Engineering Politecnico di Torino Torino Italy

ISBN: (纸本)9781138028845

the paper reviews some recent numerical applications for the interpretation and exploitation of Acoustic Emission (AE) monitoring results. Among possible numerical techniques, the Finite Element Method and the Distinct Method are considered. the analyzed numerical models cover the entire scale range, from microstructure and meso-structure, up to full size real structures. the micro modeling includes heterogeneous concrete-like material as well as the meso-structure of the masonry texture, where each brick and mortar joint is modeled singularly. the full size models consider different typology of historical structure such as masonry towers, cathedrals and chapels. the main difficulties and advantages of the different numerical approaches, depending on the problem typology and scale, are critically analyzed. the main insight we can achieve from micro and meso numerical modeling concern the scaling of AE as a function of volume and time, being also able to mimic the b-value temporal evolution as the damage spread into the structure. the finite element modeling of the whole structure provides useful hints for the optimal placement of the AE sensors, while the combination of AE monitoring results is crucial for a reliable assessment of the structural safety. © 2016 Taylor & Francis Group, London.

关键词： numerical models

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3D numerical simulation and ground motion prediction: Verification, validation and beyond Lessons from the E2VP project

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SOIL DYNAMICS AND EARthQUAKE engineering 2016年 91卷 53-71页

作者： Maufroy, E. Chaljub, E. Hollender, F. Bard, P. -Y. Kristek, J. Moczo, P. De Martin, F. theodoulidis, N. Manakou, M. Guyonnet-Benaize, C. Hollard, N. Pitilakis, K. Univ Grenoble Alpes ISTerre CNRS IRDIFSTTAR Grenoble France CEA French Alternat Energies & Atom Energy Commiss DEN St Paul Les Durance France Comenius Univ Fac Math Phys & Informat Bratislava Slovakia Slovak Acad Sci Inst Earth Sci Bratislava Slovakia Bur Rech Geol & Minieres Orleans France ITSAK Inst Engn Seismol & Earthquake Engn Thessaloniki Greece Aristotle Univ Thessaloniki Thessaloniki Greece CEA Cadarache France

the Euroseistest Verification and Validation Project (E2VP) is part of a series of complementary benchmarking exercises launched to better assess the ability of numerical simulation to accurately predict seismic ground motion. E2VP targeted more specifically the current, most-advanced numerical methods applied to realistic 3D, linear models of sedimentary basins through a quantitative comparison of the recorded and numerically simulated ground motions. the target site, located within the Mygdonian basin near thessaloniki, Greece, has been thoroughly investigated for two decades and a detailed, realistic 3D model has been derived from geological, geophysical and geotechnical investigations, while a dedicated instrumentation provided a significant number of surface and borehole recordings. Verification and validation tests up to a frequency of 4 Hz, much beyond the 0.4 Hz fundamental frequency of the deepest part of the graben, have been performed for a set of 19 local, small to moderate magnitude events. For careful and accurate enough computations, the model-to-model differences are smaller than the model-to-observations differences, the latter being controlled by uncertainties primarily in the crustal propagation model and source properties, and secondarily in the shallow structure. It is therefore recommended to prefer distant and/or deep events (R > 10-20 km, Z > 8-10 km) for validation exercises. Additional sensitivity tests illustrate the ability of carefully verified numerical simulation tools to provide an instructive insight at the structure of the so-called "aleatory" variability of ground motion, for both its within- and between-event components. the between-event variability is shown to be very sensitive to hypocenter location errors (even as low as +/- 2 km), and to uncertainty in magnitude estimates. It explains the increase of aleatory variability for small magnitude events and emphasizes the usefulness of dense seismological networks. the within event

关键词： Ground motion numerical simulation Validation Site effects Goodness-of-fit GMPE Aleatory variability

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Prediction of 1-D heave of a natural expansive soil slope of Zao-yang in China using the SWCC-based and water content-based models 6th

Prediction of 1-D heave of a natural expansive soil slope of...

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6th Asia-Pacific conference on Unsaturated Soils

作者： Tu, H. Y. Vanapalli, S. K. Univ Ottawa Ottawa ON Canada

ISBN: (纸本)9781315643342;9781138029217

Various empirical and experimental methods are available in the literature;respectively, for the estimation and determination of swelling pressure for expansive soils. Empirical methods are only valid for expansive soils for which they have been proposed. Experimental methods on the other hand are expensive, cumbersome and time-consuming for use in conventional geotechnical engineering practice. To overcome the above limitations, two models have been proposed in the recent literature for predicting the swelling pressure. One of these models uses the Soil-Water Characteristic Curve (SWCC) as a tool and the other is a water content-based model. Both these models are respectively used in the present study to predict the variation of swelling pressure with respect to initial soil suction and/or water content for the natural expansive soil at Zao-yang location in China. the predicted swelling pressure is then used to estimate the ground heave at the same site with an equation proposed by the authors of this paper. this equation has been proposed by modifying Fredlund (1983) equation to estimate the 1-D heave of unsaturated expansive soils. these techniques have been combined and extended in the present study for predicting the evolution of ground heave taking account of artificial rainfall in the numerical analyses. the predicted variations of ground heave using the two models are then compared with the monitored data of the investigated natural expansive soil slope. there is a reasonable comparison between the measured ground heave at Zao-yang using the SWCC model and predicted values;however, the water content based model over estimates the ground heave.

关键词： geotechnical engineering

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Earthing system resistance calculation using analytical approach with mutual coefficients

Earthing system resistance calculation using analytical appr...

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International Scientific conference on Electric Power engineering (EPE)

作者： Vaclav Vycital Michal Ptacek Petr Toman David Topolanek Faculty of Electrical Engineering and Communication Brno University of Technology Brno Czech Republic

ISBN: (纸本)9781509064076

the basic formulas for analytical determination of the earthing system resistance are given by the european standard EN 50522:2010 [1] in its annex J. As these formulas are rather vague about how to determine the earthing system resistance for more complicated shapes of earthing systems consisting of more basic earthing electrodes (e.g. strip, rod, ring), this formulas are cited in the Czech Republic's specific document PNE 33 0000-4 [2] and they are supplemented with the mutual coefficients. these mutual coefficients should incorporate into the calculation the effect of mutual potentials caused by the potential of other electrodes and thus make it possible to use the basic formulas even for the complicated shapes of earthing systems. thus the method introduced by the PNE document is introduced in this paper. To assess the correctness of the mutual coefficients two other calculation methods were taken into account. First, the numerical finite element method was used as the most precise method and the second method was chosen as the analytical method introduced by Dwight [6]. the results of both analytical methods were compared with the results of finite element method and it was pointed out to the possible usage limitation and possible error being made using the PNE document analytical approach.

关键词： Resistance Concrete Standards Grounding Shape Strips Finite element analysis

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numerical methods in geotechnical engineering - Proceedings of the 8th european conference on numerical methods in geotechnical engineering, NUMGE 2014

Numerical Methods in Geotechnical Engineering - Proceedings ...

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

ISBN: (纸本)9781138026889

the proceedings contain 217 papers. the topics discussed include: a better tool for general modeling of strain softening soils in slopes and excavations;modeling unloading/reloading in peat using a kinematic bubble model;implicit implementation of the prevost model;a constitutive model of normally consolidated clay at small strains;attributes of rotational hardening rules in clay plasticity;on the modeling of grain crushing in hypoplasticity;the numerical implementation of elastic visco-plastic model for soft clays;introduction of a thermodynamically hyperelastic model for peat;significance of sample quality in settlement analysis of field cases;calibration of the mechanical parameters for the numerical simulations of dynamic centrifuge experiments;and micro-piles under dynamic horizontal excitation: field tests and numerical modeling.

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numerical methods in geotechnical engineering - Proceedings of the 8th european conference on numerical methods in geotechnical engineering, NUMGE 2014

Numerical Methods in Geotechnical Engineering - Proceedings ...

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

ISBN: (纸本)9781138026872

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A Highly Scalable Implementation of Inexact Nonlinear FETI-DPWithout Sparse Direct Solvers

A Highly Scalable Implementation of Inexact Nonlinear FETI-D...

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european conference on numerical Mathematics and Advanced Applications (ENUMAth)

作者： Klawonn, Axel Lanser, Martin Rheinbach, Oliver Univ Cologne Math Inst Weyertal 86-90 D-50931 Cologne Germany Tech Univ Bergakad Freiberg Fak Math & Informat Inst Numer Math & Optimierung Akademiestr 6 D-09596 Freiberg Germany

ISBN: (纸本)9783319399294;9783319399270

A variant of a nonlinear FETI-DP domain decomposition method is considered. It is combined with a parallel algebraic multigrid method (BoomerAMG) in a way which completely removes sparse direct solvers from the algorithm. Scalability to 524,288 MPI ranks is shown for linear elasticity and nonlinear hyperelasticity using more than half of the JUQUEEN supercomputer (JSC, Julich;TOP500 rank: 11th).

关键词： Domain decomposition methods

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Experimental and numerical studies on the lateral pressure acting on piles due to horizontal soil movements 16

Experimental and numerical studies on the lateral pressure a...

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16th european conference on Soil Mechanics and geotechnical engineering, ECSMGE 2015

作者： Bauer, J. Reul, O. Department of Geotechnical Engineering University of Kassel Germany

ISBN: (纸本)9780727760678

In soft soil layers vertical piles are frequently loaded by horizontal soil movements caused by eccentric loading or unloading of the ground surface around the piles. In many cases, calculation methods do not consider possible influences on the resulting pile loads. In the scope of the paper, experimental and numerical studies are presented, which investigate the influence of parameters such as the size and the shape of the pile and the roughness of the pile-soil-interface on the lateral pressure acting on piles. © the authors and ICE Publishing: All rights reserved, 2015.

关键词： Piles

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Application of alternative methods of slope stability improvement on landfills 16

Application of alternative methods of slope stability improv...

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16th european conference on Soil Mechanics and geotechnical engineering, ECSMGE 2015

作者： Koda, E. Osiński, P. Department of Geotechnical Engineering Faculty of Civil and Environmental Engineering Warsaw University of Life Sciences Warsaw Poland

ISBN: (纸本)9780727760678

the material presented is focused on diverse methods of slopes reinforcement using anthropogenic materials, geosynthetics, by-products and recycled materials. the case study of Radiowo landfill presented in the paper proves that diverse alternative techniques of slope stability could improve the factor of safety significantly. the engineering solutions introduced on the presented landfill slopes mainly consisted of horizontally applied disposed tires mattresses, slag and debris material from the landfill site, composition of geomaterials and vegetation cover. the results of the influence of applied solutions were obtained on the basis of numerical analysis utilising Limit Equilibrium Method and Finite Element Method. the numerical analyses were conducted including the influence of reinforcements and all the geotechnical parameters of waste materials used. the important part of the study was determination of geotechnical parameters of waste.. the recommended methods for evaluation are presented in the paper. the Radiowo landfill case study proves that alternative methods for slop stability improvement, described in the paper, could be successfully applied on old municipal landfills. © the authors and ICE Publishing: All rights reserved, 2015.

关键词： Slope stability

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