Bettungsverbesserung von Tübbingringen mittels Geotextilschläuchen

Translated title of the contribution: Bedding improvement of lining segments using geotextile tubes

Michael R. Henzinger, Andreas Lange, Günther M. Volkmann, Bernd A. Moritz, Wulf Schubert

Research output: Contribution to journalArticle

Abstract

During a shield TBM excavation in hard rock, the immediate backfill of the crown immediately behind the shield is technically difficult to realize. With the advance of the cutter head a relocation process of pea gravel within the annular gap is triggered, leading to an insufficient bedding distribution of the first segments behind the shield tail and to an ovalization of the segmental lining at a certain load level. During a test application as part of an ”TBM research initiative“ of the Austrian Federal Railways geotextile tubes were integrated into the exterior surface of the segments. Immediately after leaving the shield tail, the geotextile tube, which is placed all around one ring of segments, is expanded by injection with grout. As a result, an immediate bedding between the rock mass and segmental lining is established, also preventing the rearrangement of pea gravel within the annular gap when the shield is moved forward. The displacement measurements have shown that the ring of segments equipped with geotextile tubes experiences a more rigid body motion like behaviour after leaving the shield tail with a minimal ovalization only. Numerical simulations show the influence of bedding improvement on the ovalization of the ring of segments after leaving the shield tail.

Original languageGerman
Pages (from-to)589-598
Number of pages10
JournalGeomechanics and Tunnelling
Volume11
Issue number5
DOIs
Publication statusPublished - 1 Oct 2018

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology

Fields of Expertise

  • Sustainable Systems

Treatment code (Nähere Zuordnung)

  • Application

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