Delma de Mattos Vidal

@ita.br

Geotechnical Engineering Professor
Technological Institute of Aeronautics

Delma de Mattos Vidal


               Download Compact PDF  
https://researchid.co/delma
23

Scopus Publications

341

Scholar Citations

7

Scholar h-index

7

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, Delma Vidal
    E3s Web of Conferences, 2024
    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, et al.
    Geosynthetics International, 2024
    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.
  • Uni and bi-directional dewatering behaviour of open geotextile containers used for filtration of waste slurries
    Rodrigo A. e Silva, Delma Vidal
    Geotextiles and Geomembranes, 2022
  • Application of polyelectrolytes for improving the dewatering performance of drinking water treatment sludge using geotextiles
    Livia Luiza de Souza Avancini, Matheus Muller, Delma de Mattos Vidal
    Revista Ambiente E Agua, 2021
    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, Delma De Mattos Vidal
    Revista Ambiente E Agua, 2020
    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, Delma De Mattos Vidal
    E3s Web of Conferences, 2019
    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, D. de Mattos Vidal
    Geosynthetics International, 2019
    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, Elizeu Nascimento Filho
    Geotecnia, 2019
    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.
  • A review of theoretical methods for quantifying the number of constrictions in nonwoven geotextile filters
    11th International Conference on Geosynthetics 2018 Icg 2018, 2018
  • Influence of water treatment plant sludge characteristics on its dewaterability in geotextile closed systems
    11th International Conference on Geosynthetics 2018 Icg 2018, 2018
  • Reinforced walls - Effect of the distance between reinforcements on reduced models
    11th International Conference on Geosynthetics 2018 Icg 2018, 2018
  • Construction methodology and dimensioning of silt fences: Scientific, normative and laboratorial review
    11th International Conference on Geosynthetics 2018 Icg 2018, 2018
  • Degradation of polypropylene woven geotextile: Tensile creep and weathering
    M. G. A. Guimarães, D. de Mattos Vidal, D. de Carvalho Urashima, C. A. C. Castro
    Geosynthetics International, 2017
  • Unsaturated flow behavior of leak-detection systems with geonets
    10th International Conference on Geosynthetics Icg 2014, 2014
  • Some aspects of the durability testing for geosynthetics exposed to climatic degradation agents
    10th International Conference on Geosynthetics Icg 2014, 2014
  • Retention analysis of nonwoven geotextile filters during filtration of suspended solids
    9th International Conference on Geosynthetics Geosynthetics Advanced Solutions for A Challenging World Icg 2010, 2010
  • Geosynthetics applied to base reinforcement - TBR and LCR parameters evaluation from a real field condition experiment
    9th International Conference on Geosynthetics Geosynthetics Advanced Solutions for A Challenging World Icg 2010, 2010
  • Mechanical behavior of a PVC geosynthetic barrier exhumed from an industrial waste disposal trench
    9th International Conference on Geosynthetics Geosynthetics Advanced Solutions for A Challenging World Icg 2010, 2010
  • Metallic mesh with geosynthetic retention strips for slope protection against superficial erosion
    9th International Conference on Geosynthetics Geosynthetics Advanced Solutions for A Challenging World Icg 2010, 2010
  • Laboratory studies on geotextiles tube dewatering by pressure filtratio test in reduced model
    9th International Conference on Geosynthetics Geosynthetics Advanced Solutions for A Challenging World Icg 2010, 2010
  • Analytical solution for Luscher's problems on two-layer consolidation
    Paulo I.B. Queiroz, Delma M. Vidal
    Soils and Rocks, 2008
  • A rational design for textile filters: Retention criterion
    Solos E Rochas, 2006
  • Private communication consultancy towards the year 2000
    British Telecommunications Engineering, 1990

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 32 (1), 169-179 , 2025
    2025
    Citations: 7
  • 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
    2023
    Citations: 1
  • Influence of lateral restriction on bags for dewatering sludge of water treatment plants
    M Müller, D Vidal, GA Oliveira
    Geosynthetics: Leading the Way to a Resilient Planet, 1581-1587 , 2023
    2023
  • Sludge dewatering with geotextile refill in a draining container: case study in a water treatment plant
    M Müller, D Vidal, EA Guanaes, MR de Freitas
    REVISTA DELOS 16 (45), 1732-1747 , 2023
    2023
  • Comparativo de desaguamento em ensaio piloto entre bolsas geotêxteis com e sem drenagem vertical
    M Müller, D Vidal, EA Guanaes, MR de Freitas
    REVISTA DELOS 16 (45), 1721-1731 , 2023
    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
    2023
  • Installation damage of a geogrid employed for stabilization in a mining area
    DO Tschöke, D de Mattos Vidal, CAT do Carmo
    International Journal of Geosynthetics and Ground Engineering 9 (1), 10 , 2023
    2023
    Citations: 5
  • 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
    2022
    Citations: 3
  • Application of polyelectrolytes for improving the dewatering performance of drinking water treatment sludge using geotextiles
    LLS Avancini, M Muller, DM Vidal
    Revista Ambiente & Água 16 (5), e2723 , 2021
    2021
    Citations: 2
  • Utilização de polieletrólitos para melhorar o desempenho de desaguamento de lodos de ETA em tubos geotêxteis
    LLS Avancini, M Muller, DM Vidal
    Revista Ambiente & Água 16, e2723 , 2021
    2021
  • Coastal protection jetty with geotextile tubes core and artificial beach creation in Tocopilla, Chile
    M MÜLLER, E GUANAES, D VIDAL
    Huesker , 2021
    2021
  • Geogrid-reinforced layer approach using DEM modeling
    MG Moravia
    Université Grenoble Alpes [2020-....]; Instituto tecnólogico de aeronáutica … , 2020
    2020
    Citations: 1
  • Approche MED du renforcement des sols granulaires par géogrilles
    MG Moravia
    Université Grenoble Alpes , 2020
    2020
  • Influence of sand addition in the early stage retention of fine sludge dewatering by geotextile
    GLA Oliveira, DM Vidal
    Revista Ambiente & Água 15, e2527 , 2020
    2020
    Citations: 2
  • Influência das exposições aberta e fechada na durabilidade de geossintéticos sob intempéries Influence of the open and backed exposures on the geosynthetics’ durability by …
    MGA Guimarães, D de Carvalho Urashima, D de Mattos Vidal, ...
    Braz. J. of Develop 6 (6), 37031-37049 , 2020
    2020
    Citations: 1
  • Influência da adição de areia na retenção inicial do desaguamento de lodos finos por geotêxtil
    GLA Oliveira, DM Vidal
    Revista Ambiente & Água 15, e2527 , 2020
    2020
  • Interveniência de reforço em lastro ferroviário sob carga de alto tráfego
    LGP Oran, DM Vidal, JS Romero, K Garcia, E Nascimento Filho
    Geotecnia, 29-41 , 2019
    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
    2019
    Citations: 24
  • Geogrid pull-out modelling using DEM
    M Guadagnin Moravia, P Villard, D de Mattos Vidal
    E3S Web of Conferences 92, 13015 , 2019
    2019
    Citations: 4
  • 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
    2019
    Citations: 5

MOST CITED SCHOLAR PUBLICATIONS

  • Degradation of polypropylene woven geotextile: tensile creep and weathering
    D Guimarães, M.G.A., de Mattos Vidal, D., De Carvalho Urashima
    Geosynthetics International jgein.16.00029 , 2017
    2017
    Citations: 40
  • Dewatering of sludge from a water treatment plant in geotextile closed systems
    MGA GUIMARAES, DC URASHIMA, DM VIDAL
    Geosynthetics International 21, 310-320 , 2014
    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
    2019
    Citations: 24
  • Geotextile filter design by probabilistic analysis
    DC Urashima, DM Vidal
    Proceedings of the 6th International Conference on Geosynthetics, Atlanta … , 1998
    1998
    Citations: 19
  • Performance of two geotextile reinforced soil slopes
    M Ehrlich, D Vidal, PA Carvalho
    Proceedings of International Symposium on Recent Developments in Soil and … , 1997
    1997
    Citations: 15
  • Interaçao solo-reforço e mecanismos de ruptura em solos reforçados com geotêxteis
    RC Gomes
    Universidade de São Paulo , 1993
    1993
    Citations: 14
  • Dimensionamento de filtros e drenos em geossintéticos
    D Vidal, DC Urashima
    Proc. Simpósio Sul-Americano de Geossintéticos, CD-ROM, Rio de Janeiro , 1999
    1999
    Citations: 10
  • 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 32 (1), 169-179 , 2025
    2025
    Citations: 7
  • 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
    2006
    Citations: 7
  • 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
    2002
    Citations: 7
  • O conceito de fatores de redução aplicados às propriedades dos geossintéticos
    DM Vidal, TW Fabrin, FT Montez
    1º SSAG-Simp Sul Americano de Geos./3SBG-3º Simp. Bras. de Geossintéticos … , 1999
    1999
    Citations: 7
  • Comparison between open and closed system for dewatering with geotextile: Field and comparative study
    M Müller, D Vidal
    Int. J. Civ. Environ. Eng 13, 634-639 , 2019
    2019
    Citations: 6
  • Filtering systems particles retention analysis by probabilistic theory and simulation
    DC Urashima, D Vidal
    GEOFILTERS 3rd Internation al Conference on Filters and Filtration Phenomena … , 2000
    2000
    Citations: 6
  • Installation damage of a geogrid employed for stabilization in a mining area
    DO Tschöke, D de Mattos Vidal, CAT do Carmo
    International Journal of Geosynthetics and Ground Engineering 9 (1), 10 , 2023
    2023
    Citations: 5
  • 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
    2019
    Citations: 5
  • Fatores de influência no comportamento de camadas anti-reflexão de trincas com geossintéticos.
    F Wickert
    2003
    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
    2000
    Citations: 5
  • Propriedades hidráulicas dos geotê xteis
    DM Vidal, CC Righetti
    VI CBGE, IX COBRAMSEF, Salvador, 589-596 , 1990
    1990
    Citations: 5
  • Geotê xtil: Propriedades e Ensaios
    DM Vidal
    Manual té cnico geotê xtil Bidim, 1-31 , 1990
    1990
    Citations: 5
  • Geogrid pull-out modelling using DEM
    M Guadagnin Moravia, P Villard, D de Mattos Vidal
    E3S Web of Conferences 92, 13015 , 2019
    2019
    Citations: 4