PSI - Issue 54

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 54 (2024) 553–560

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review under responsibility of the scientific committee of the ICSI 2023 organizers Retaining walls are often needed near railway tracks, to maintain the geometry of the surrounding earth and thus ensure the safety of the trains. Their maintenance can pose a challenge due to the shifting of the land over time which may cause landslides, that would potentially obstruct the railway and require manual intervention. As part of the Ferrovia 4.0 project which aims to improve Portuguese railways, a system was developed to capture the 3D shape of railway retaining walls as the train passes by. The system makes use of two cameras, positioned at different angles to more easily obtain details of the retaining wall. An algorithm was developed, allowing the system to capture several images as the train passes through an area of interest, which are then processed using Pix4Dmapper, resulting in a point cloud of the retaining wall. The system starts and ends its acquisition automatically, depending on its GPS coordinates. It was possible to successfully captures images of areas of interest and the resulting point clouds can be further analyzed to identify areas that may require intervention. This work was developed in the scope of the project FERROVIA 4.0, nº 46111 which has received funding from “ANI - Agência Nacional de Inovação, S.A” through the programme “Mobilizador COPROMOÇÃO_PT2020”. © 2023 The Authors, Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the ICSI 2023 organizers Keywords: Photogrammetry; Point Cloud; Railway International Conference on Structural Integrity 2023 (ICSI 2023) Development of a photogrammetric system for railway retaining walls analysis Francisco Afonso a, *, Pedro Sousa a , Nuno Viriato a , Francisco Barros a , Paulo Tavares a , Pedro Moreira a a INEGI, Campus da FEUP, Rua Dr. Roberto Frias 400, Porto 4200-465, Portugal Abstract

E-mail address: fafonso@inegi.up.pt

2452-3216 © 2023 The Authors, Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the ICSI 2023 organizers

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the ICSI 2023 organizers 10.1016/j.prostr.2024.01.118