Tunnel Face Stability Laboratory Tests in Sand Considering Surface Settlements

Senent Domínguez, Salvador and García Luna, Ramiro and Sánchez Lázaro, Miguel and Jiménez Rodriguez, Rafael (2019). Tunnel Face Stability Laboratory Tests in Sand Considering Surface Settlements. In: "XVII European Conference on Soil Mechanics and Geotechnical Engineering", 1 – 6 of September 2019, Reykjavík, Iceland. ISBN 978-9935-9436-1-3.

Description

Title: Tunnel Face Stability Laboratory Tests in Sand Considering Surface Settlements
Author/s:
  • Senent Domínguez, Salvador
  • García Luna, Ramiro
  • Sánchez Lázaro, Miguel
  • Jiménez Rodriguez, Rafael
Item Type: Presentation at Congress or Conference (Other)
Event Title: XVII European Conference on Soil Mechanics and Geotechnical Engineering
Event Dates: 1 – 6 of September 2019
Event Location: Reykjavík, Iceland
Title of Book: Proceedings of the XVII European Conference on Soil Mechanics and Geotechnical Engineering
Date: 2019
ISBN: 978-9935-9436-1-3
Subjects:
Freetext Keywords: Partial Collapse; Critical Pressure; Structure from Motion
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ingeniería y Morfología del Terreno
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The results of two tunnel face stability laboratory tests, considering partial collapse and employing a small-scale model at single gravity, are presented. The tunnel is modeled by a rigid cylinder and the collapse of the face is triggered by the retraction of a piston that supports the soil. Both the collapse of the tunnel face and the deformation of the surface are studied. Dry sand with two different relative densities (loose and dense) is employed. By means of the low-cost Structure from Motion photogrammetric technique, a precise threedimensional model of the material surface is obtained; consequently, it is possible to reproduce the surface settlements during test execution. Results presented herein are primarily focused on the shape of the settlement troughs for loose and dense sand, and on the capability of the Structure from Motion technique for this type of analysis. Additionally, the relationship between the collapse of the tunnel face and the surface settlement is studied. Results show that surface deformations before the activation of the collapse mechanism are small, and mainly depend on the relative density of the material. ----------RÉSUMÉ---------- Cet article porte sur les résultats de deux essais de laboratoire sur la rupture partielle du front de taille d’un tunnel, avec un modèle à échelle réduite. Le tunnel est modélisé par un cylindre rigide, afin que la rupture du front soit provoquée par la rétraction d'un piston qui soutient le sol. On etude à la fois l'effondrement du front et les déformations sur la surface du terrain, en utilisant comme matériel d’éssai un sable avec deux densités relatives différentes (soit-disant compacte et lâche). En utilisant la technique photogrammétrique à faible coût “Structure from Motion”, on obtient un modèle tridimensionnel précis de la surface du matériau; il est pourtant possible de reproduire les tassements produits pendant l'essai. Les résultats présentés ici portent principalement sur la forme des cuvettes de tassements et sur la capacité de la technique “Structure from Motion” d’enregistrer ce type de test. En plus, on étude la relation entre l'effondrement du front de taille et les tassements. Les résultats montrent que les déformations superficielles avant l'activation du mécanisme de rupture sont faibles et qu’elles dépendent principalement de la densité relative du matériel d’essai.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainBIA2015-69152-RUnspecifiedUnspecifiedPredicción y análisis de deformaciones para la seguridad en túneles

More information

Item ID: 67841
DC Identifier: https://oa.upm.es/67841/
OAI Identifier: oai:oa.upm.es:67841
Official URL: https://www.ecsmge-2019.com/uploads/2/1/7/9/21790806/proceedings-v1a.pdf
Deposited by: Memoria Investigacion
Deposited on: 20 Oct 2021 15:28
Last Modified: 20 Oct 2021 15:30
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