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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Format: | Article |
Language: | English |
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Mouloud Mammeri University of Tizi-Ouzou
2022-02-01
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Series: | Journal of Materials and Engineering Structures |
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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. |
first_indexed | 2024-12-12T22:12:10Z |
format | Article |
id | doaj.art-ed7a3b075cac45c3b8f3e4328bdce842 |
institution | Directory Open Access Journal |
issn | 2170-127X |
language | English |
last_indexed | 2024-12-12T22:12:10Z |
publishDate | 2022-02-01 |
publisher | Mouloud Mammeri University of Tizi-Ouzou |
record_format | Article |
series | Journal of Materials and Engineering Structures |
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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