Effects of round length and excavation phases in the NATM induced surface settlement: Line 4 of Tehran metro
Access Status
Authors
Date
2010Type
Metadata
Show full item recordCitation
Source Title
ISSN
Collection
Abstract
In order to control settlement induced by tunneling in urban area, effective parameters in the excavation procedures should be determined with respect to the geotechnical properties and construction methods. In NATM, round length and sequence of excavation phases are the significant parameters that affect on tunneling economically and technically. These two factors have a great relationship with time and cost of tunneling projects. Therefore, determination the optimum amount of those parameters is the main challenge in such projects. In this paper, the effects of round length and excavation phases on surface settlement in line four of Tehran metro, still in construction, were evaluated. To do the analyses, a three-dimensional finite element package was used to simulate the tunnel operations for different number of round length. The results showed that, regarding to the geotechnical properties and tunnel dimensions in line four areas, the round length was determined conservatively. Therefore, it can be suggested that in order to improve efficiency, the round length is determined 2 and 3 meter in upper and lower parts of tunnel cross-section, respectively.
Related items
Showing items related by title, author, creator and subject.
-
Arabnejad, H.; Sharifzadeh, Mostafa; Moarefvand, P.; Shahriar, K. (2010)The long water transfer tunnel of Kerman in the length of 63.5 kilometers is a part of the longterm water supply project of the city of Kerman, which should be conveyed water from Safa and Sarmeshk dam reservoir to the ...
-
Bagherzadeh, A.; Ferdosi, Behnam; Nakhaei, J.; Nasri, M. (2014)This paper presents the design and 3D numerical modeling of the temporary support system for the twin tunnels in the transition zone of the Esfahan subway project. Ground movements caused by tunneling beneath urban areas ...
-
Karimzade, E.; Sharifzadeh, Mostafa; Zarei, H.; Shahriar, K.; Cheraghi Seifabad, M. (2017)© 2017, Saudi Society for Geosciences. Groundwater flow is a major issue in underground opening in fractured rocks. Because of finding the fracture connectivity, contribution of each fracture in flow, and fracture ...