The investigation of Cut-and-cover, top-down construction method for a metro underground station; case study: 'Naghsh-e-Jahan Metro Station, Esfahan, Iran'

Naghsh-e-Jahan subway station is located in Esfahan historical context with 186 meters' distance to the Sheikh Fazlolah mosque – one of the historical cosmopolitan attractions. The subway station is in a shallow depth, soft surrounding soils and with wide span and in a downtown location, have m...

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Main Authors: Cambyse BEHNIA, Amir TAVALLAIE NEJAD, Hossein SALARI RAD
Format: Article
Language:English
Published: Mouloud Mammeri University of Tizi-Ouzou 2022-02-01
Series:Journal of Materials and Engineering Structures
Subjects:
Online Access:http://revue.ummto.dz/index.php/JMES/article/view/3020
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author Cambyse BEHNIA
Amir TAVALLAIE NEJAD
Hossein SALARI RAD
author_facet Cambyse BEHNIA
Amir TAVALLAIE NEJAD
Hossein SALARI RAD
author_sort Cambyse BEHNIA
collection DOAJ
description Naghsh-e-Jahan subway station is located in Esfahan historical context with 186 meters' distance to the Sheikh Fazlolah mosque – one of the historical cosmopolitan attractions. The subway station is in a shallow depth, soft surrounding soils and with wide span and in a downtown location, have made the situation so critical that precise assessments, not only for the station support but also for compensating the ground settlement, are needed. One of the prerequisite procedures for large underground structures, the cut-and-cover approach, is constructed top-down using the Diaphragm Wall system. This method can be functional in conditions where minimum vertical displacements are essential since roof covering and improvement can be performed even when the excavation operation is not terminated. The embankment process can be done just right after the roof slab is complete and reaches reliable strength. This study uses the Finite Element method to simulate all the construction stages and analyze the ground behavior. It has been observed that the width and the length of diaphragm walls and middle barrettes on the ground settlements. Ground settlement for various stages of excavation at the cross-section and longitudinal section of the station is shown that settlements are spandrel and maximum settlements occur close to the diaphragm walls. As excavation continues, ground surface settlements become concave, and the maximum surface settlements occur at a bit of distance from the diaphragm walls for about 17mm. Furthermore, the diaphragm wall's thickness of 100 cm of diaphragm wall is recommended for optimum values.
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spelling doaj.art-ed7a3b075cac45c3b8f3e4328bdce8422022-12-22T00:10:13ZengMouloud Mammeri University of Tizi-OuzouJournal of Materials and Engineering Structures2170-127X2022-02-01844915041995The investigation of Cut-and-cover, top-down construction method for a metro underground station; case study: 'Naghsh-e-Jahan Metro Station, Esfahan, Iran'Cambyse BEHNIA0Amir TAVALLAIE NEJAD1Hossein SALARI RAD2Amir Kabir University of TechnologySchool of Civil Engineering, University of TehranAmir Kabir University of TechnologyNaghsh-e-Jahan subway station is located in Esfahan historical context with 186 meters' distance to the Sheikh Fazlolah mosque – one of the historical cosmopolitan attractions. The subway station is in a shallow depth, soft surrounding soils and with wide span and in a downtown location, have made the situation so critical that precise assessments, not only for the station support but also for compensating the ground settlement, are needed. One of the prerequisite procedures for large underground structures, the cut-and-cover approach, is constructed top-down using the Diaphragm Wall system. This method can be functional in conditions where minimum vertical displacements are essential since roof covering and improvement can be performed even when the excavation operation is not terminated. The embankment process can be done just right after the roof slab is complete and reaches reliable strength. This study uses the Finite Element method to simulate all the construction stages and analyze the ground behavior. It has been observed that the width and the length of diaphragm walls and middle barrettes on the ground settlements. Ground settlement for various stages of excavation at the cross-section and longitudinal section of the station is shown that settlements are spandrel and maximum settlements occur close to the diaphragm walls. As excavation continues, ground surface settlements become concave, and the maximum surface settlements occur at a bit of distance from the diaphragm walls for about 17mm. Furthermore, the diaphragm wall's thickness of 100 cm of diaphragm wall is recommended for optimum values.http://revue.ummto.dz/index.php/JMES/article/view/3020underground stationcut-and-cover top-down methodground settlementnumerical modeling
spellingShingle Cambyse BEHNIA
Amir TAVALLAIE NEJAD
Hossein SALARI RAD
The investigation of Cut-and-cover, top-down construction method for a metro underground station; case study: 'Naghsh-e-Jahan Metro Station, Esfahan, Iran'
Journal of Materials and Engineering Structures
underground station
cut-and-cover top-down method
ground settlement
numerical modeling
title The investigation of Cut-and-cover, top-down construction method for a metro underground station; case study: 'Naghsh-e-Jahan Metro Station, Esfahan, Iran'
title_full The investigation of Cut-and-cover, top-down construction method for a metro underground station; case study: 'Naghsh-e-Jahan Metro Station, Esfahan, Iran'
title_fullStr The investigation of Cut-and-cover, top-down construction method for a metro underground station; case study: 'Naghsh-e-Jahan Metro Station, Esfahan, Iran'
title_full_unstemmed The investigation of Cut-and-cover, top-down construction method for a metro underground station; case study: 'Naghsh-e-Jahan Metro Station, Esfahan, Iran'
title_short The investigation of Cut-and-cover, top-down construction method for a metro underground station; case study: 'Naghsh-e-Jahan Metro Station, Esfahan, Iran'
title_sort investigation of cut and cover top down construction method for a metro underground station case study naghsh e jahan metro station esfahan iran
topic underground station
cut-and-cover top-down method
ground settlement
numerical modeling
url http://revue.ummto.dz/index.php/JMES/article/view/3020
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