Delma de Mattos Vidal

@ita.br

Geotechnical Engineering Professor
Technological Institute of Aeronautics



              

https://researchid.co/delma
0

Scopus Publications

3

Scholar Citations

0

Scholar h-index

0

Scholar i10-index

Scopus Publications

  • Analysis of the maximum reinforcement loads of four MSE walls compared to the values predicted by the AASHTO 2020 specification
    Keli Bohrer and Delma Vidal
    EDP Sciences
    Mechanically stabilized earth (MSE) systems are a well-known and applicable solution for retaining walls, that presents a composite structure consisting of layers of backfill soil with rigid or flexible reinforcement inclusions. The stability of the wall system is derived from the interaction between the backfill and soil reinforcements involving friction and tension. The wall facing has as its main function to prevent erosion of the structural backfill. The design of MSE walls is usually divided in two phases: external and internal stability. Although there are many methods to design MSE walls, the Coherent Gravity Method is the most common used for MSE walls reinforced with inextensible (steel) reinforcements, the Simplified Method for both steel and geosynthetics reinforced wall systems and the new one included in 2020, Stiffness Method, to calculate the maximum reinforcement loads, Tmax, for extensible (geosynthetics) reinforced MSE walls (all these methods are outlined in Section 11 of the AASHTO LRFD Bridge Design Specifications 2020) . The main objective of this paper is to carry out the analysis of the 3 methods available at AASHTO and compare the results from full-scale MSE walls and the predicted Tmax values.

  • Natural weathering effects of nonwoven geotextile exposed to different climate conditions
    J. L. E. Dias Filho, J. L. Silva, C. A. Valentin, M. P. Fleury, M. A. Aparicio-Ardila, D. M. Vidal, and C. M. L. Costa
    Emerald
    Humidity, air temperature, rainfall and solar radiation all contribute to the weathering of geosynthetics. Over time, their useful life can be affected and changes in properties can be observed, which affects the performance of these materials. As geosynthetics durability analyses must encompass each work condition, assessing the climate effects is essential for design purposes. This study exposed a nonwoven needle-punched poly(ethylene) terephthalate geotextile to natural weathering in three Brazilian cities (different exogenous environments) for 18 months. Mechanical tests were conducted to evaluate the geotextile changes due to weathering. This was demonstrated by the results: exposure to weather leads to the deterioration of the geotextile mechanical properties and increased stiffness. After four months, the tensile strength fell by half, while the deformation needed more than 12 months to have this same reduction; ultraviolet radiation intensity was the most effective weathering condition in the field; humidity and rainfall can affect the stiffness of geotextiles; the impact of accumulated climate factors gradually showed a convergence in the response of geotextile to weathering. Thus, this work highlights the need to evaluate the climate conditions in each location to understand the material's behavior on the exposure time.


  • Application of polyelectrolytes for improving the dewatering performance of drinking water treatment sludge using geotextiles
    Livia Luiza de Souza Avancini, Matheus Muller, and Delma de Mattos Vidal
    Instituto de Pesquisas Ambientais em Bacias Hidrograficas (IPABHi)
    The sludge generated at drinking water treatment plants (WTPs) is a high-moisture content residue, and therefore difficult to handle, transport, dispose of or recover. During the last decades, geotextile tubes have been successfully applied to reduce the residue volume, facilitate its handling and subsequent reuse. This study aimed to understand the factors that interfere in the filtration and dewatering efficiencies and to experimentally analyze the dewatering process of WTPs sludge, evaluating different test procedures and investigating the influence of the type and dosage of polymeric additives on dewatering performance. Geotextile cone dewatering tests and geotextile bag dewatering tests were performed, using four different woven geotextile samples and an aluminum sulfate WTP sludge sample. The results showed that the use of geotextile cone dewatering tests for geotextile selection and for additive selection and dosage was representative for the dewatering process intended, reflecting the results verified in the geotextile bag dewatering tests. Sludge chemical conditioning increased dewatering rate and solids retention during the tests’ early stages, but it did not result in a higher final solids content sludge cake.
 Keywords: dewatering systems, geosynthetics, waste management.

  • Influence of sand addition in the early stage retention of fine sludge dewatering by geotextile
    Gabriel Luis Anibal de Oliveira and Delma De Mattos Vidal
    Instituto de Pesquisas Ambientais em Bacias Hidrograficas (IPABHi)
    The need to investigate viable methods to facilitate correct disposal of high-water content waste is immediate in the scenario of water source degradation. In this context, Closed Geotextile Systems (CGS) have shown promise for dewatering a variety of high water-content sediments, aiming to reduce the waste final volume, encapsulating particles, and at the same time allowing fluid drainage. Especially in Water Treatment Plants, the geotextiles generally employed in these systems have good tensile strength and rigidity to support mechanical solicitations and hydraulic properties that warrant good drainage conditions. In these applications, the geotextile element should assure the waste confinement and retention of some particles that will form a filter cake which will control internal flow conditions. The present work investigated how small portions of sand influence fine-particle retention. The sludge used consisted of a mixture of filtered water with two well-defined fractions of ground quartz: FG, a silt and CG, a fine sand. The results show that small amounts of sand are capable of leading to the formation of a pre-filter, even if the maximum diameter of the fine particles is much less than the geotextile filtration opening size.  The test results indicate that the retention efficiency gradually increases as CG increases in the solution, up to a fraction of CG close to 14%, which represents only 0.7% of the total solution mass. The increase in particle retention was directly proportional to the increase in the GC fraction until reaching the filtration efficiency of approximately 72% where it stabilizes.

  • Geogrid pull-out modelling using DEM
    Marcus Guadagnin Moravia, Pascal Villard, and Delma De Mattos Vidal
    EDP Sciences
    With the advancement of the use of synthetic reinforcements in geotechnics, a greater understanding of the mechanisms involved in soil-reinforcement interaction is the focus of major research centres on the subject. The topic of this study is the shearing behaviour at interfaces between granular materials and geogrids. The main objective is to provide a more fundamental understanding of some micromechanisms present in this type of interface, which in turn are important to optimize the design of such reinforcement. The numerical modelling of these reinforced structures must deal with the complexity of the material-reinforcement interaction problem; therefore, it requires specific numerical models whose formulations admit localized behaviours in the contacts as well as the granular nature of the material (e.g., soil, gravel, ballast). A robust and flexible way of modelling this problem is through the Discrete Element Method (DEM). The DEM proposes to model this granular nature by representing the soil as interacting constituent particles, whose behaviour is ruled by physical laws defined at the contact points. The numerical approach is desirable since it allows, in an articulated and relatively fast way, studying closely different regions of the interface, in order to identify factors and variables that are important for the problem. The purpose involves the DEM for a 3D modelling of a geogrid pull-out test to calculate the magnitude of forces in different elements of the geogrid (i.e., nodes, longitudinal and transverse members). Preparation of numerical samples has a particular importance in the final results of simulations. Thus, the numerical techniques used to obtain better geometry for the geogrid and a granular assembly with a representative grain rolling effect are also presented in this paper.

  • A new image-based technique for measuring pore size distribution of nonwoven geotextiles
    R. A. e Silva, R. G. Negri, and D. de Mattos Vidal
    Thomas Telford Ltd.
    The use of digital images to evaluate geotextile characteristics has appeared in the scientific literature, particularly for estimating the pore size distribution (PSD) of nonwoven geotextiles used...

  • Intervenience of reinforcement in railway ballast with load of high traffic
    Luiz Gustavo Paulo Oran, Delma Mattos Vidal, José Souza Romero, Kledermon Garcia, and Elizeu Nascimento Filho
    Coimbra University Press
    Os lastros constituintes da superestrutura de vias permanentes, quando submetidos a cargas cíclicas de alta intensidade e frequência, sofrem desgaste rápido em sua estrutura portante. Os desguarnecimentos e nivelamentos dos lastros demandam grandes volumes por quilômetro devido à sua degradação. Seus ombros e altura mínimos de construção definem contornos de seções com largas bases de brita. Devido a isso, o desgaste do particulado e seus custos de manutenção inflam o orçamento das ferrovias. Com esse mote, escolheu-se aqui caminhar por um itinerário investigativo cujo paradigma tem seu cerne no conceito de confinamento e seus efeitos sobre o Módulo de Resiliência do lastro. A pesquisa se manteve nos efeitos práticos de reforços por geogrelhas aplicado dentro do corpo do lastro e não na interface com a camada subjacente. Nesse trabalho atingiu-se o objetivo proposto de levantar parâmetros diretivos para orientar ensaios de desempenho de reforços e possibilitar a melhor compreensão das causalidades decorrentes das propriedades específicas das geogrelhas como abertura da malha e rigidez dos elementos, bem como correlacionar o efeito da cota de posicionamento do reforço e os efeitos sobre o grau de confinamento gerado.

  • Influence of water treatment plant sludge characteristics on its dewaterability in geotextile closed systems


  • Reinforced walls - Effect of the distance between reinforcements on reduced models


  • Construction methodology and dimensioning of silt fences: Scientific, normative and laboratorial review


  • A review of theoretical methods for quantifying the number of constrictions in nonwoven geotextile filters


  • Degradation of polypropylene woven geotextile: Tensile creep and weathering
    M. G. A. Guimarães, D. de Mattos Vidal, D. de Carvalho Urashima, and C. A. C. Castro
    Thomas Telford Ltd.
    Maintaining satisfactory properties in geosynthetics exposed to factors that could lead to their degradation needs to be considered in projects employing these materials. Geosynthetics subjected to tensile creep and weathering can undergo premature degradation over time. It is essential to study the influence of these factors, since they could act simultaneously in some applications. To assess the synergetic effects, frames were developed and four groups of a woven geotextile polypropylene sample were tested. The first and second groups were subjected to tensile creep at 5% and 10% of the tensile strength in conjunction with weathering for 2160 h. The third group was exposed to the same weathering conditions without tensile load. The fourth group was subjected to tensile creep at 10% of the tensile strength in laboratory conditions. Frames were built with a slope similar to the location of exposure to guarantee greater effects of weathering on the material surface. A meteorological station at the site mon...

  • Unsaturated flow behavior of leak-detection systems with geonets


  • Some aspects of the durability testing for geosynthetics exposed to climatic degradation agents


  • Metallic mesh with geosynthetic retention strips for slope protection against superficial erosion


  • Mechanical behavior of a PVC geosynthetic barrier exhumed from an industrial waste disposal trench


  • Geosynthetics applied to base reinforcement - TBR and LCR parameters evaluation from a real field condition experiment


  • Laboratory studies on geotextiles tube dewatering by pressure filtratio test in reduced model


  • Retention analysis of nonwoven geotextile filters during filtration of suspended solids


  • Analytical solution for Luscher's problems on two-layer consolidation


  • A rational design for textile filters: Retention criterion


  • Private communication consultancy towards the year 2000


RECENT SCHOLAR PUBLICATIONS

  • Natural weathering effects of nonwoven geotextile exposed to different climate conditions
    JLE Dias Filho, JL Silva, CA Valentin, MP Fleury, MA Aparicio-Ardila, ...
    Geosynthetics International, 1-11 2024

  • Evaluation of the hydraulic behavior of hydrophilic and hydrophobic geotextiles under hydrostatic pressure test
    LC Rodrigues, DM Vidal
    Geosynthetics: Leading the Way to a Resilient Planet, 1603-1609 2023

  • Influence of lateral restriction on bags for dewatering sludge of water treatment plants
    M Mller, D Vidal, GA Oliveira
    Geosynthetics: Leading the Way to a Resilient Planet, 1581-1587 2023

  • Sludge dewatering with geotextile refill in a draining container: case study in a water treatment plant
    M Mller, D Vidal, EA Guanaes, MR de Freitas
    REVISTA DELOS 16 (45), 1732-1747 2023

  • Comparativo de desaguamento em ensaio piloto entre bolsas geotxteis com e sem drenagem vertical
    M Mller, D Vidal, EA Guanaes, MR de Freitas
    REVISTA DELOS 16 (45), 1721-1731 2023

  • Guest Editorial for the Special Issue on “Geosynthetics in Mining”
    J Lins da Silva, D de Mattos Vidal
    International Journal of Geosynthetics and Ground Engineering 9 (1), 13 2023

  • Installation damage of a geogrid employed for stabilization in a mining area
    DO Tschke, D de Mattos Vidal, CAT do Carmo
    International Journal of Geosynthetics and Ground Engineering 9 (1), 10 2023

  • Uni and bi-directional dewatering behaviour of open geotextile containers used for filtration of waste slurries
    RA e Silva, D Vidal
    Geotextiles and Geomembranes 50 (2), 347-356 2022

  • Utilizao de polieletrlitos para melhorar o desempenho de desaguamento de lodos de ETA em tubos geotxteis
    LLS Avancini, M Muller, DM Vidal
    Revista Ambiente & gua 16, e2723 2021

  • Application of polyelectrolytes for improving the dewatering performance of drinking water treatment sludge using geotextiles
    LLS Avancini, M Muller, DM Vidal
    Revista Ambiente & gua 16, e2723 2021

  • Coastal protection jetty with geotextile tubes core and artificial beach creation in Tocopilla, Chile
    M MLLER, E GUANAES, D VIDAL
    Huesker 2021

  • Geogrid-reinforced layer approach using DEM modeling
    MG Moravia
    Universit Grenoble Alpes [2020-....]; Instituto tecnlogico de aeronutica 2020

  • Approche MED du renforcement des sols granulaires par gogrilles
    MG Moravia
    Universit Grenoble Alpes 2020

  • Influence of sand addition in the early stage retention of fine sludge dewatering by geotextile
    GLA Oliveira, DM Vidal
    Revista Ambiente & gua 15, e2527 2020

  • Influncia da adio de areia na reteno inicial do desaguamento de lodos finos por geotxtil
    GLA Oliveira, DM Vidal
    Revista Ambiente & gua 15, e2527 2020

  • Influncia das exposies aberta e fechada na durabilidade de geossintticos sob intempries
    MGA Guimares, D de Carvalho Urashima, D de Mattos Vidal, ...
    Brazilian Journal of Development 6 (6), 37031-37049 2020

  • Intervenincia de reforo em lastro ferrovirio sob carga de alto trfego
    LGP Oran, DM Vidal, JS Romero, K Garcia, E Nascimento Filho
    Geotecnia, 29-41 2019

  • A New Image-Based Technique for Measuring Pore Size Distribution of Nonwoven Geotextiles
    RA R. A. e Silva, RG Negri, D Mattos Vidal
    Geosynthetics International 26 (3), 261-272 2019

  • Intervenience of reinforcement in railway ballast with load of high traffic
    LGP Oran, DM Vidal, JAS Romero, K Garcia, E Nascimento Filho, ...
    Geotecnia 145, 29-41 2019

  • Anlise da degradao de um geotxtil tecido em rea de dunas
    BOF Silva, CML Costa, IC Fernandes, JL Silva, DM Vidal, CA Valentin
    Anais do Geossintticos 2019

MOST CITED SCHOLAR PUBLICATIONS

  • Degradation of polypropylene woven geotextile: tensile creep and weathering
    D Guimares, M.G.A., de Mattos Vidal, D., De Carvalho Urashima
    Geosynthetics International jgein.16.00029 2017
    Citations: 38

  • Dewatering of sludge from a water treatment plant in geotextile closed systems
    MGA GUIMARAES, DC URASHIMA, DM VIDAL
    Geosynthetics International 21, 310-320 2014
    Citations: 37

  • A New Image-Based Technique for Measuring Pore Size Distribution of Nonwoven Geotextiles
    RA R. A. e Silva, RG Negri, D Mattos Vidal
    Geosynthetics International 26 (3), 261-272 2019
    Citations: 20

  • Geotextile filter design by probabilistic analysis
    DC Urashima, DM Vidal
    Proceedings of the 6th International Conference on Geosynthetics, Atlanta 1998
    Citations: 18

  • Interaao solo-reforo e mecanismos de ruptura em solos reforados com geotxteis
    RC Gomes, D Vidal
     1993
    Citations: 16

  • Performance of two geotextile reinforced soil slopes
    M Ehrlich, D Vidal, PA Carvalho
    Proceedings of International Symposium on Recent Developments in Soil and 1997
    Citations: 14

  • Dimensionamento de filtros e drenos em geossintticos
    D Vidal, DC Urashima
    Proc. Simpsio Sul-Americano de Geossintticos, CD-ROM, Rio de Janeiro 1999
    Citations: 10

  • O conceito de fatores de reduo aplicados s propriedades dos geossintticos
    DM Vidal, TW Fabrin, FT Montez
    1 SSAG-Simp Sul Americano de Geos./3SBG-3 Simp. Bras. de Geossintticos 1999
    Citations: 9

  • Medicin y comparacin de la rugosidad en pavimentos de la ciudad de Hunuco: mediante smartphone y un mtodo tradicional
    D Vidal Asencios
     2016
    Citations: 8

  • Numerical tools for geosynthetic reinforced walls design: a performance assessment on basis of laboratory-scale models results
    PI Queiroz, N Batista, CT Santos, D Vidal, RC Gomes
    8th International conference on Geosynthetics, 1335-1338 2006
    Citations: 7

  • Installation damage of a geogrid employed for stabilization in a mining area
    DO Tschke, D de Mattos Vidal, CAT do Carmo
    International Journal of Geosynthetics and Ground Engineering 9 (1), 10 2023
    Citations: 6

  • Comparison between open and closed system for dewatering with geotextile: Field and comparative study
    M Mller, D Vidal
    Int. J. Civ. Environ. Eng 13, 634-639 2019
    Citations: 6

  • Intervenience of reinforcement in railway ballast with load of high traffic
    LGP Oran, DM Vidal, JAS Romero, K Garcia, E Nascimento Filho, ...
    Geotecnia 145, 29-41 2019
    Citations: 5

  • Analysis of filtration systems by probabilistic theory and simulation methods
    D Urashima, D Vidal
    7th International Geosynthetics Conference - State of the Arts, 1115-1118 2002
    Citations: 5

  • A study about geosynthetic-reinforced foundation
    TW Fabrin, DM Vidal, A Faleiros
    Proceedings of the Second European Geosynthetics Conference, Bologna, Italy, 311 2000
    Citations: 5

  • Geogrid pull-out modelling using DEM
    MG Moravia, P Villard, DDM Vidal
    E3S Web of Conferences 92, 13015 2019
    Citations: 4

  • A review of theoretical methods for quantifying the number of constrictions in nonwoven geotextile filters
    RA Silva, DM Vidal
    Proceedings of the 11th International Conference on Geosynthetics, Seoul 2018
    Citations: 4

  • Unsaturated flow behavior of leak-detection systems with geonets
    DM VIDAL, PIB QUEIROZ, CT SANTOS
    10th International Conference on Geosynthetics, Berlim, 8 2014
    Citations: 4

  • Chemical ageing and creep analyses - influence of synergy and test specimen preparation
    R Trentini, D Vidal, P Martins
    8th International conference on Geosynthetics, 1609-1612 2006
    Citations: 4

  • Influencia da estrutura polimerica nos parametros de comportamento de campo dos geossinteticos
    R Trentini, D Vidal
    IX EINCITA, 1-6 2006
    Citations: 4