Comparative study on the design process of a shallow subway station Isfahan metro, Iran, based on risk assessment
By: Nejad, Amir Tavallaie
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Contributor(s): Rad, Hossein Salari.
Publisher: USA Springer 2023Edition: Vol.53(3), Jun.Description: 562-582p.Subject(s): Civil EngineeringOnline resources: Click here
In:
Indian geotechnical journalSummary: One of the construction methods for shallow subway stations is a cut-and-cover approach using the diaphragm wall system. This method can be functional in conditions where minimum displacements are essential. M2 island station of Isfahan metro in Iran, with a 100-m length and 23-m width, is close to the historical area of Naghshe Jahan Square, one of the historical cosmopolitan attractions in Iran. The current subway station is located at a shallow depth, high groundwater level, with the soft surrounding soil, and constructed with a wide span in the downtown area. It made it critical that precise assessments are needed for the station support and for compensating for the ground settlement. This study uses the finite element method to simulate all the construction stages and analyze the ground behavior. In the first step, the proper construction method is selected, and then the geometry of diaphragm walls, middle barrettes, and slab thickness is assigned. The ground settlements and internal forces in the structural elements are observed. The optimum values for structural elements properties and construction methods are chosen for the M2 station. Ground settlement for various stages of excavation at the station's cross section shows a concave form, and the maximum surface settlement of 18.2 mm occurs at a short distance away from the diaphragm wall. Furthermore, the risk of damage to buildings is assessed using the vulnerability index and deformation parameters, and finally, seven buildings around the M2 station in categories 4 and 5 for damages.
| Item type | Current location | Call number | Status | Date due | Barcode | Item holds |
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Articles Abstract Database
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School of Engineering & Technology (PG) Archieval Section | Not for loan | 2023-1209 |
One of the construction methods for shallow subway stations is a cut-and-cover approach using the diaphragm wall system. This method can be functional in conditions where minimum displacements are essential. M2 island station of Isfahan metro in Iran, with a 100-m length and 23-m width, is close to the historical area of Naghshe Jahan Square, one of the historical cosmopolitan attractions in Iran. The current subway station is located at a shallow depth, high groundwater level, with the soft surrounding soil, and constructed with a wide span in the downtown area. It made it critical that precise assessments are needed for the station support and for compensating for the ground settlement. This study uses the finite element method to simulate all the construction stages and analyze the ground behavior. In the first step, the proper construction method is selected, and then the geometry of diaphragm walls, middle barrettes, and slab thickness is assigned. The ground settlements and internal forces in the structural elements are observed. The optimum values for structural elements properties and construction methods are chosen for the M2 station. Ground settlement for various stages of excavation at the station's cross section shows a concave form, and the maximum surface settlement of 18.2 mm occurs at a short distance away from the diaphragm wall. Furthermore, the risk of damage to buildings is assessed using the vulnerability index and deformation parameters, and finally, seven buildings around the M2 station in categories 4 and 5 for damages.
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