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Dreimalige Durchörterung einer Störungszone: NÖT hilft TBM zum Erfolg
Author(s) -
Pilgerstorfer Thomas,
Hölzl Harald,
Moritz Bernd
Publication year - 2020
Publication title -
geomechanics and tunnelling
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.317
H-Index - 18
eISSN - 1865-7389
pISSN - 1865-7362
DOI - 10.1002/geot.202000030
Subject(s) - excavation , context (archaeology) , situated , heading (navigation) , hazard , engineering , plan (archaeology) , geotechnical engineering , civil engineering , mining engineering , geology , computer science , paleontology , chemistry , organic chemistry , artificial intelligence , aerospace engineering
This paper discusses the design and construction of a fault zone of the OeBB Koralmtunnel lot KAT3. Due to the experience gained during the advance of the parallel‐situated southbound tunnel and the aim to minimize the geotechnical hazard for the subsequent excavation of the northbound TBM bore, an extensive redesign regarding the excavation‐concept and ‐method was performed. Five different alternative solutions have been subject to a risk analysis to optimize the required measures and to minimize the cost‐effective risks and hazards to an acceptable level. The set of measures, which was evaluated and juxtaposed, contained solutions for strengthening the rock mass with grouting from the TBM and from aside the bore, conventional tunnelling and backfill with a top heading or full‐face excavation. Finally, the fault zone has been excavated with a conventional top heading drive from a nearby‐situated cross‐passage. Subsequently this tunnel stretch has been excavated by TBM without any construction delay. The paper focuses on highlighting the importance of a consequent application of the observational method and thereof derived measures in the context of a geotechnical safety management plan for controlling the residual risks.