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

Hakkı Erman Ergincan; Tolga Y. Ozudogru; Irem Zeynep Yildirim

doi:10.1061/9780784485347.015

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

Department of Civil Engineering

Bogazici University

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

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 language	English
Title of host publication	Geotechnical Special Publication
Editors	T. Matthew Evans, Nina Stark, Susan Chang
Publisher	American Society of Civil Engineers (ASCE)
Pages	140-151
Number of pages	12
Edition	GSP 352
ISBN (Electronic)	9780784485309, 9780784485316, 9780784485323, 9780784485330, 9780784485347, 9780784485354
DOIs	https://doi.org/10.1061/9780784485347.015
Publication status	Published - 2024
Event	Geo-Congress 2024: Geotechnical Data Analysis and Computation - Vancouver, Canada Duration: 25 Feb 2024 → 28 Feb 2024

Publication series

Name	Geotechnical Special Publication
Number	GSP 352
Volume	2024-February
ISSN (Print)	0895-0563

Conference

Conference	Geo-Congress 2024: Geotechnical Data Analysis and Computation
Country/Territory	Canada
City	Vancouver
Period	25/02/24 → 28/02/24

Bibliographical note

Publisher Copyright:
© ASCE.

Access to Document

10.1061/9780784485347.015

Cite this

Ergincan, H. E., Ozudogru, T. Y., & Yildirim, I. Z. (2024). Numerical Modeling of NATM Tunnels Pre-Supported with Umbrella Arch Method: Comparison with Field Measurements. In T. M. Evans, N. Stark, & S. Chang (Eds.), Geotechnical Special Publication (GSP 352 ed., pp. 140-151). (Geotechnical Special Publication; Vol. 2024-February, No. GSP 352). American Society of Civil Engineers (ASCE). https://doi.org/10.1061/9780784485347.015

Ergincan, Hakkı Erman ; Ozudogru, Tolga Y. ; Yildirim, Irem Zeynep. / Numerical Modeling of NATM Tunnels Pre-Supported with Umbrella Arch Method : Comparison with Field Measurements. Geotechnical Special Publication. editor / T. Matthew Evans ; Nina Stark ; Susan Chang. GSP 352. ed. American Society of Civil Engineers (ASCE), 2024. pp. 140-151 (Geotechnical Special Publication; GSP 352).

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

abstract = "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 {\c C}ekmek{\"o}y-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.",

author = "Ergincan, {Hakkı Erman} and Ozudogru, {Tolga Y.} and Yildirim, {Irem Zeynep}",

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doi = "10.1061/9780784485347.015",

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Ergincan, HE, Ozudogru, TY & Yildirim, IZ 2024, Numerical Modeling of NATM Tunnels Pre-Supported with Umbrella Arch Method: Comparison with Field Measurements. in TM Evans, N Stark & S Chang (eds), Geotechnical Special Publication. GSP 352 edn, Geotechnical Special Publication, no. GSP 352, vol. 2024-February, American Society of Civil Engineers (ASCE), pp. 140-151, Geo-Congress 2024: Geotechnical Data Analysis and Computation, Vancouver, Canada, 25/02/24. https://doi.org/10.1061/9780784485347.015

Numerical Modeling of NATM Tunnels Pre-Supported with Umbrella Arch Method: Comparison with Field Measurements. / Ergincan, Hakkı Erman; Ozudogru, Tolga Y.; Yildirim, Irem Zeynep.
Geotechnical Special Publication. ed. / T. Matthew Evans; Nina Stark; Susan Chang. GSP 352. ed. American Society of Civil Engineers (ASCE), 2024. p. 140-151 (Geotechnical Special Publication; Vol. 2024-February, No. GSP 352).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Ergincan, Hakkı Erman

AU - Ozudogru, Tolga Y.

AU - Yildirim, Irem Zeynep

PY - 2024

Y1 - 2024

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AB - 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.

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ER -

Ergincan HE, Ozudogru TY, Yildirim IZ. Numerical Modeling of NATM Tunnels Pre-Supported with Umbrella Arch Method: Comparison with Field Measurements. In Evans TM, Stark N, Chang S, editors, Geotechnical Special Publication. GSP 352 ed. American Society of Civil Engineers (ASCE). 2024. p. 140-151. (Geotechnical Special Publication; GSP 352). doi: 10.1061/9780784485347.015

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

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