Behaviour of transversal joints in prefabricated tunnel linings. Experimental and theoretical study

• Autores: Cosimo Iasiello
• Directores de la Tesis: Alejandro Pérez Caldentey (dir. tes.)
• Lectura: En la Universidad Politécnica de Madrid ( España ) en 2017
• Idioma: español
• Tribunal Calificador de la Tesis: Javier León González (presid.), Miguel Angel Astiz Suárez (secret.), Héctor Cifuentes Bulté (voc.), Antoni Cladera Bohigas (voc.), Fernando Martínez-Abella (voc.)
• Programa de doctorado: Programa de Doctorado en Ingeniería de Estructuras, Cimentaciones y Materiales por la Universidad Politécnica de Madrid
• Materias:
  • Ciencias tecnológicas
    • Tecnología de la construcción
      • Tecnología del hormigón
      • Túneles
• Enlaces
  • Tesis en acceso abierto en: Archivo Digital UPM
• Resumen

  • This work deals with the characterization and analysis of construction defects in TBM tunnel construction, with more emphasis on the behaviour of joints between segments.

    Contributions are made towards defining a methodology for classification, measurement and analysis of various defects arising in this type of construction including: lack of backfill and resulting cracking of segments, ovalisation of rings, misalignment, joint opening and ruptures at joints. Measurement techniques are described including an innovative instrument to accurately measure misalignment and rotation at key-segment joint.

    Then, a methodology for the analysis of cracking and yielding of segments due to lack of backfill is presented making use of plastic analysis. The principal virtue of this approach is that it can be easily applied with very simple means, available to the average designers. It also makes manifest the critical structural role played by assembly bolts which are normally considered only as secondary non-structural elements.

    Finally, an experimental program carried out to investigate the compressive resistance of joints and the development of confining stresses is presented. An equivalence between geometric and stress confinement is analysed. It observed that a common type of defect, rupture at edges of segments near the longitudinal joints may be due to a lack of longitudinal stress confinement and the absence of geometric confinement.