317 documents found, page 1 of 32
A modified Rowe cell with bender elements for small strain shear modulus measur...
Almukashfi, Abdalla Mustafa Abdalla; Castellanza, Ricardo; Correia, A. Gomes; Arroyo, Marcos; Zuretti, Carlo; Bendea, Daniela; Moldovan, Ionut DragosThe small strain shear modulus (G0) is an important characteristic of geomaterials. Its laboratory measurements are very frequently based on bender element transducers installed in different geotechnical apparatuses. Despite their widespread use, there is room to improve the precision, reproducibility, and robustness of bender element measurements, which are currently hampered by an oversimplified interpretatio...
Earthworks management, monitoring and optimization system based on digital twin...
Parente, Manuel; Amândio, Margarida; Moreira, Vicente; Correia, A. GomesThe aim of planning earthworks is to provide a efficient and economical scheduling of the available resources. However, it is common for unforeseen situations to occur, as a result of breakdowns in mechanical resources, or adverse weather conditions, leading to the need to constantly reorganise the workflow on the construction site. This paper describes an innovative methodology to support the decision-making p...
Short and long term performance of a slab track in a transition zone: an embank...
Ramos, Ana; Correia, A. Gomes; Calçada, RuiRailway track transition zones are characterised by an abrupt change in track support stiffness, which increases dynamic wheel loads and leads to the acceleration of differential settlement and track degradation. This work aims to study concrete slab track transition zones, with a focus on embankment-to-tunnel sections. The analysis uses a hybrid methodology, combining 3D finite element modelling with empirical...
A toolbox for the automatic interpretation of bender element tests in geomechanics
Moldovan, Ionuţ Dragoş; Almukashfi, Abdalla Mustafa Abdalla; Correia, A. GomesFirst Online: 20 November 2022; The small strain shear modulus is an important characteristic of geomaterials that can be measured using bender element experiments. However, most conventional interpretation techniques are based on the visual observation of the output signal and are inherently subjective. Other techniques, based on the cross-correlation of input and output signals lack physical insight, as they ...
Prediction model for permanent deformation of railway subgrade using an artific...
Ramos, Ana; Correia, A. Gomes; Calçada, RuiThe prediction of the permanent deformation in the subgrade and its reliability is one of the main concerns of the Railway Infrastructure Managers, as it can influence the reduction of the maintenance costs of the track in service. This study proposes a novel methodology for predicting permanent deformation based on a parametric study performed using a hybrid approach that includes the short and long term perfo...
Case study of an inert steel aggregate in road construction: characterization a...
Fortunato, Eduardo; Roque, António José; Correia, A. GomesThe use of alternative materials, in particular industrial by-products and waste materials, in the construction of transport infrastructures and geotechnical works, has been promoted across the world. Nonetheless, considering that, in most situations, the application of some of these materials is fairly recent, little information is available on the long-term performance of the infrastructures in which they wer...
Preface [to Trends on construction in the Digital Era: proceedings of ISIC 2022]
Correia, A. Gomes; Azenha, Miguel; Cruz, Paulo J. S.; Novais, Paulo; Pereira, Paulo A. A.[Excerpt] The International Society for Intelligent Construction 2022 Conference (ISIC 2022) is the third ISIC international conference, following the first conference in Minnesota, USA, in 2017 and the second conference in Beijing, China, in 2019. This conference is organized under the umbrella of the International Society for Intelligent Construction (ISIC) following the mission: “… promote intelligent constr...
An evolutionary neural network approach for slopes stability assessment
Tinoco, Joaquim; Correia, A. Gomes; Cortez, Paulo; Toll, DavidA current big challenge for developed or developing countries is how to keep large-scale transportation infrastructure networks operational under all conditions. Network extensions and budgetary constraints for maintenance purposes are among the main factors that make transportation network management a non-trivial task. On the other hand, the high number of parameters affecting the stability condition of engin...
Trends on construction in the Digital Era: proceedings of ISIC 2022
Correia, A. Gomes; Azenha, Miguel; Cruz, Paulo J. S.; Novais, Paulo; Pereira, Paulo A. A.[Excerpt] The International Society for Intelligent Construction 2022 Conference (ISIC 2022) is the third ISIC international conference, following the first conference in Minnesota, USA, in 2017 and the second conference in Beijing, China, in 2019.This conference is organized under the umbrella of the International Society for Intelligent Construction (ISIC) following the mission: “… promote intelligent constru...
Influence of train speed and its mitigation measures in the short- and long-ter...
Ramos, Ana; Calçada, Rui; Correia, A. GomesThe ballastless track is nowadays the most popular railway system due to the required low number of maintenance operations and costs, despite the high investment. The gradual change from ballasted to ballastless tracks has been occurring in Asia, but also in Europe, increasing the number of transition zones. The transition zones are a special area of the railway networks where there is an accelerated process of...