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Experimental and analytical study of concrete blocks subjected to concentrated loads with an application to TBM-constructed tunnels
Liao, Lin; Fuente Antequera, Albert de la; Pialarissi Cavalaro, Sergio Henrique; Aguado de Cea, Antonio; Carbonari, Gilberto
Universitat Politècnica de Catalunya. Departament d'Enginyeria de la Construcció; Universitat Politècnica de Catalunya. EC - Enginyeria de la Construcció
To generate enough thrust for a Tunnel Boring Machine (TBM) to excavate a soil and advance, several jacks are typically used to apply force to the last installed ring that acts as a reaction frame. These loads generate bursting stresses that might cause cracks in the longitudinal direction of the segments. Many studies dedicated to evaluate this phenomenon focus mainly on elements with similar height-to-length ratios. To cover the wide variety of dimensions and load application patterns, additional experimental assessments are required. The objectives of the present paper are to extend the study of with different height-to-length ratios subjected to concentrated loads and to validate analytical formulations for the verification of concrete segments in SLS and ULS. To accomplish this, an experimental program was carried out using small-scale specimens with and without fibre reinforcement. The results obtained were used to validate the formulations derived from a struts-and-ties model. Finally, an application of the formulation proposed to the case study of Line 9 in Barcelona is presented. This study represents a contribution towards the development of engineered approaches for the design of segmented linings.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Túnels i excavacions
Tunnels--Design and construction
Concentrated load
Precast segment
Crack pattern
Strut and tie model
Structural design
Túnels -- Disseny i construcció
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
info:eu-repo/semantics/submittedVersion
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