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Reliability-based settlement analysis of embankments over soft soils reinforced with T-shaped deep cement mixing piles

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Frontiers of Structural and Civil Engineering 2022年第5期16卷 638-656页

作者： Chana PHUTTHANANON Pornkasem JONGPRADIST Daniel DIAS Xiangfeng GUO Pitthaya JAMSAWANG julien BAROTH Construction Innovations and Future Infrastructures Research Center Department of Civil EngineeringFaculty of EngineeringKing Mongkut’s University of Technology ThonburiBangkok 10140Thailand 3SR Laboratory Grenoble INPFrench National Centre for Scientific Research(CNRS)Grenoble Alpes UniversityGrenoble 38000France Antea Group Antony 92160France Soil Engineering Research Center Department of Civil EngineeringKing Mongkut’s University of Technology North BangkokBangkok 10800Thailand

This paper presents a reliability-based settlement analysis of T-shaped deep cement mixing(TDM)pile-supported embankments over soft *** uncertainties of the mechanical properties of the in-situ soil,pile,and embankment,and the effect of the pile shape are considered *** analyses are performed using Monte Carlo Simulations in combination with an adaptive Kriging(using adaptive sampling algorithm).Individual and system failure probabilities,in terms of the differential and maximum settlements(serviceability limit state(SLS)requirements),are *** reliability results for the embankments supported by TDM piles,with various shapes,are compared and discussed together with the results for conventional deep cement mixing pile-supported embankments with equivalent pile *** influences of the inherent variabilities in the material properties(mean and coefficient of variation values)on the reliability of the piled embankments,are also *** study shows that large TDM piles,particularly those with a shape factor of greater than 3,can enhance the reliability of the embankment in terms of SLS requirements,and even avoid unacceptable reliability levels caused by variability in the material properties.

关键词： T-shaped deep cement mixing piles piled embankments settlement reliability analysis soil uncertainties

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Effects of meteorological conditions and topography on the bioaccumulation of PAHs and metal elements by native lichen(Xanthoria parietina)

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Journal of Environmental Sciences 2021年第11期33卷 193-205页

作者： julien Dron Aude Ratier Annabelle Austruy Gautier Revenko Florence Chaspoul Emmanuel Wafo Institutécocitoyen pour la Connaissance des Pollutions Fos-sur-MerFrance Aix Marseille Université Avignon UniversitéCNRS UMR-7263IRD-237IMBEMarseilleFrance Aix Marseille Université INSERM U-1261SSAIRBAMCTMarseilleFrance Universitéde Lyon UniversitéLyon 1CNRS UMR-5558LBBEVilleurbanneFrance

The bioaccumulation of PAHs and metal elements in the indigenous lichens Xanthoria parietina was monitored during two years at a quarterly frequency,in 3 sites of contrasted anthropic *** impact of the meteorological factors(temperature,relative humidity,rainfall,wind speed)was first estimated through principal component analysis,and then by stepwise multilinear regressions to include wind *** pollutants levels reflected the proximity of atmospheric emissions,in particular from a large industrial *** humidity and mild temperatures,and in a lower extent low wind speed and rainfall,also favored higher concentration *** contributions of these meteorological aspects became minor when including wind direction,especially when approaching major emission *** bioaccumulation integration time towards meteorological variations was on a seasonal basis(1–2 months)but the wind direction and thus local emissions also relied on a longer time scale(12 months).This showed that the contribution of meteorological conditions may be prevalent in remote places,while secondary in polluted areas,and should be definitely taken into account regarding long-term lichen biomonitoring and inter-annual *** the same time,a quadruple sampling in each site revealed a high homogeneity among supporting tree species and *** resulting uncertainty,including sampling,preparation and analysis was below 30%when comfortable analytical conditions were ***,the occurrence of unexpected events such as a major forest fire,permitted to evaluate that this type of short,although intense,events did not have a strong influence on PAH and metals bioaccumulation by lichen.

关键词： Indigenous lichen Biomonitoring Climate Seasonal impacts Sampling uncertainties Integration time

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SPECIFIC DEGRADATION OF WATERSHEDS

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International Journal of Sediment Research 2007年第2期22卷 114-119页

作者： Boubacar KANE Pierre Y.julien Central Director of Water Energie du Mali S.A.formerly of Colorado State UniversityFort CollinsCO80523U. S. A Engineering Research Center Colorado State UniversityFort CollinsCO 80523U.S.A.

An extensive database of reservoir sedimentation surveys throughout continental United States is compiled and analyzed to determine specific degradation SD relationships as function of mean annual rainfall R, drainage area A, and watershed slope S. The database contains 1463 field measurements and specific degradation relationships are defined as function of A, R and S. Weak trends and significant variability in the data are noticeable. Specific degradation measurements are log normally distributed with respect to R, A, and S and 95% confidence intervals are determined accordingly. The accuracy of the predictions does not significantly increase as more independent variables are added to the regression analyses.

关键词： Specific degradation Sediment yield Reservoir sedimentation

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High-Order Schemes Combining the Modified Equation Approach and Discontinuous Galerkin Approximations for the Wave Equation

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Communications in Computational Physics 2012年第2期11卷 691-708页

作者： Cyril Agut julien Diaz Abdelaaziz Ezziani LMA CNRS UMR 5142Universite de PauFrance INRIA Bordeaux Research Center Project Team Magique3DFrance

We present a new high ordermethod in space and time for solving the wave equation,based on a newinterpretation of the“Modified Equation”***,contrary to most of the works,we consider the time discretization before the space *** the time discretization,an additional biharmonic operator appears,which can not be discretized by classical finite *** propose a new Discontinuous Galerkinmethod for the discretization of this operator,andwe provide numerical experiments proving that the new method is more accurate than the classicalModified Equation technique with a lower computational burden.

关键词： High order schemes discontinuous Galerkin method acoustic wave equation

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Impact of Varying Blower Opening Degrees on Indoor Environment and Thermal Comfort

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Fluid Dynamics & Materials Processing 2024年第8期20卷 1703-1716页

作者： Shengqiang Shi Abdelatif Merabtine Rachid Bennacer julien Kauffmann UR LASMIS Universitéde Technologie de Troyes12 Rue Marie CurieTroyes10300France EPF Campus de Troyes Rosière-prés-Troyes10430France Construction Engineering Department École de Technologie Supérieure(ÉTS)University of Québec1100 Rue Notre-Dame OuestMontrealQC H3C 1K3Canada LMT/ENS-Paris-Saclay/CNRS UniversitéParis SaclayGif-sur-Yvette91190France

At present,air handling units are usually used indoors to improve the indoor environment ***,while introducing fresh air to improve air quality,air velocity has a certain impact on the occupants’thermal ***,it is necessary to explore the optimization of air-fluid-body interaction *** this study,the indoor air flow was changed by changing the opening and closing degree of the blower,and the thermal manikin is introduced to objectively evaluate the human thermal comfort under different air *** main experimental results show that the air change rate increases with the increase of the opening and closing degree of the blower considering an ACH(air changes per hour)range between 3.8 and *** a better prediction,a linear correlation with a coefficient of 0.995 is *** the blower’s opening is adjusted to 20%,25%,30%,35%,and 40%,the air velocity sensor positioned directly beneath the air inlet records average velocities of 0.19,0.20,0.21,0.28,and 0.34 m/s over four hours,*** on thermal comfort and the average sensation experienced by individuals indicate an initial increase followed by a decline when the blower’s operation begins,with optimal conditions achieved at a 35%*** findings offer valuable insights for future indoor air ventilation and heat transfer design strategies.

关键词： Air handle unit air velocity thermal comfort thermal sensation

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Micro-Differential Boundary Conditions Modelling the Absorption of Acoustic Waves by 2D Arbitrarily-Shaped Convex Surfaces

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Communications in Computational Physics 2012年第2期11卷 674-690页

作者： Helene Barucq julien Diaz Veronique Duprat INRIA Bordeaux-Sud Ouest Team-project MAGIQUE-3D LMA CNRS UMR 5142University of PauFrance

We propose a new Absorbing Boundary Condition(ABC)for the acoustic wave equation which is derived from a micro-local diagonalization process formerly defined by *** and which does not depend on the geometry of the surface bearing the *** considering the principal symbol of the wave equation both in the hyperbolic and the elliptic regions,we show that a second-order ABC can be constructed as the combination of an existing first-order ABC and a Fourier-Robin *** compare the new ABC with other ABCs and we show that it performs well in simple configurations and that it improves the accuracy of the numerical solution without increasing the computational burden.

关键词： Wave equation micro-local diagonalization absorbing boundary condition finite element formulation

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A high-order SPH method by introducing inverse kernels

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Chinese Journal of Aeronautics 2017年第1期30卷 1-14页

作者： Fang Le Marongiu Jean Christophe Leduc julien Amicarelli Andrea Caro Joёlleb LMP Ecole centrale de Pekin Beihang University Co-Innovation Center for Advanced Aero-Engine 100083 Beijing China LMFA Ecole centrale de Lyon 69130 Ecully BP 163 France Laboratoire International Associe Beihang University 100083 Beijing China ANDRITZ HYDRO AG Rue des Deux-Gares 6 1800 Vevey Switzerland

The smoothed particle hydrodynamics（SPH） method is usually expected to be an efficient numerical tool for calculating the fluid-structure interactions in compressors; however, an endogenetic restriction is the problem of low-order consistency. A high-order SPH method by introducing inverse kernels, which is quite easy to be implemented but efficient, is proposed for solving this restriction. The basic inverse method and the special treatment near boundary are introduced with also the discussion of the combination of the Least-Square（LS） and Moving-Least-Square（MLS） methods. Then detailed analysis in spectral space is presented for people to better understand this method. Finally we show three test examples to verify the method behavior.

关键词： Consistency High-order method Inverse method Numerical dissipation Numerical instability Smoothed particle hydrodynamics

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Sediment load calculations from point measurements in sand-bed rivers

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International Journal of Sediment Research 2015年第1期30卷 1-12页

作者： Seema C.SHAH-FAIRBANK Pierre Y julien Department of Civil Engineering California State Polytechnic University Department of Civil and Environmental Engineering Colorado State University

Point velocity and suspended sediment concentration measurements are used to calculate the total sediment discharge in sand-bed *** with the Series Expansion of the Modified Einstein Point Procedure（SEMEPP） depend on grain diameter d;and settling velocity ω,flow depth h,shear velocity u*,and sampling depth h;.This procedure extends the applicability of the Modified Einstein Procedure（MEP） by using point sediment concentration and velocity *** procedure is tested using the laboratory data from Coleman,and field measurements from the Enoree,Middle Rio Grande and Mississippi *** on 801 point measurements over 124 verticals at flow depths ranging from 0.17 m to 33.5 m and sediment concentrations less than 0.1 kg L;,the accuracy of the calculations depends on u*/ω and h;/d;.Point measurement techniques like SEMEPP are well-suited when u*/ω> 5 where at least 60%of the total sediment load is measured when 90%of the flow depth is *** determination of sediment discharge from point measurements is most accurate in deep rivers when h;/d;> *** u*/ω>*** measurements are not well-suited for shallow rivers and laboratory flumes where h< 0.5 m and when u*/ω< 2.

关键词： Point measurements Concentration profiles Velocity profiles Total sediment load Modified Einstein Procedure

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Estimating Compositions and Nutritional Values of Seed Mixes Based on Vision Transformers

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Plant Phenomics 2023年第4期5卷 805-815页

作者： Shamprikta Mehreen Hervé Goëau Pierre Bonnet Sophie Chau julien Champ Alexis Joly Inria LIRMMUniversity MontpellierCNRSMontpellierFrance CIRAD UMR AMAPMontpellierOccitanieFrance Chambre d'Agriculture-Haute Vienne LimogesNouvelle-AquitaineFrance

The cultivation of seed mixtures for local pastures is a traditional mixed cropping technique of cereals and legumes for producing,at a low production cost,a balanced animal feed in energy and protein in livestock *** considerably improving the autonomy and safety of agricultural systems,as well as reducing their impact on the environment,it is a type of crop that responds favorably to both the evolution of the European regulations on the use of phytosanitary products and the expectations of consumers who wish to increase their consumption of organic ***,farmers find it difficult to adopt it because cereals and legumes do not ripen synchronously and the harvested seeds are heterogeneous,making it more difficult to assess their nutritional *** efforts therefore remain to be made to acquire and aggregate technical and economical references to evaluate to what extent the cultivation of seed mixtures could positively contribute to securing and reducing the costs of herd *** work presented in this paper proposes new Artificial Intelligence techniques that could be transferred to an online or smartphone application to automatically estimate the nutritional value of harvested seed mixes to help farmers better manage the yield and thus engage them to promote and contribute to a better knowledge of this type of *** this purpose,an original open image dataset has been built containing 4,749 images of seed mixes,covering 11 seed varieties,with which 2 types of recent deep learning models have been *** results highlight the potential of this method and show that the best-performing model is a recent state-of-the-art vision transformer pre-trained with self-supervision(Bidirectional Encoder representation from Image Transformer).It allows an estimation of the nutritional value of seed mixtures with a coefficient of determination R^(2)score of 0.91,which demonstrates the interest of this type of approach,for its possible use

关键词： transferred cultivation harvest

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A simple model for COVID-19

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Infectious Disease Modelling 2020年第1期5卷 309-315页

作者： julien Arino Stéphanie Portet Department of Mathematics&Data Science NEXUS University of ManitobaCanada Centre for Disease Modelling Canada Canadian COVID-19 Mathematical Modelling Task Force Canada

An SL1L2I1I2A1A2R epidemic model is formulated that describes the spread of an epidemic in a *** model incorporates an Erlang distribution of times of sojourn in incubating,symptomatically and asymptomatically infectious *** properties of the model are explored,with focus on properties important in the context of current COVID-19 pandemic.

关键词： COVID-19 Mathematical model Erlang distribution Asymptomatic infections

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