Numerical Modeling of NATM Tunnels Pre-Supported with Umbrella Arch Method: Comparison with Field Measurements

Hakkı Erman Ergincan, Tolga Y. Ozudogru*, Irem Zeynep Yildirim

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Pre-support systems are required in New Austrian Tunneling Method (NATM) construction in weak soils, shallow overburden conditions, in areas of settlement-sensitive structures. Umbrella arch method (UAM) is one of these pre-support systems that generate an artificial improved roof, before the excavation. In this study, a section of the Çekmeköy-Sancaktepe-Sultanbeyli Metro Line (with twin tunnels) constructed with NATM and UAM support system is modeled and analyzed using finite element method. The tunnel section was modeled using three approaches (i.e., plate, dummy plate, and individual pipe), and the results were compared with the field measurements. The results of the numerical analysis agreed with the field measurements. The dummy plate approach resulted in more accurate settlement predictions compared to other approaches. The results also indicate that the tunnels were far enough, such that the surface settlement profile did not indicate a clear impact due to the sequence of construction of the twin tunnels.

Original languageEnglish
Title of host publicationGeotechnical Special Publication
EditorsT. Matthew Evans, Nina Stark, Susan Chang
PublisherAmerican Society of Civil Engineers (ASCE)
Number of pages12
EditionGSP 352
ISBN (Electronic)9780784485309, 9780784485316, 9780784485323, 9780784485330, 9780784485347, 9780784485354
Publication statusPublished - 2024
EventGeo-Congress 2024: Geotechnical Data Analysis and Computation - Vancouver, Canada
Duration: 25 Feb 202428 Feb 2024

Publication series

NameGeotechnical Special Publication
NumberGSP 352
ISSN (Print)0895-0563


ConferenceGeo-Congress 2024: Geotechnical Data Analysis and Computation

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