Location
Chicago, Illinois
Date
02 May 2013, 4:00 pm - 6:00 pm
Abstract
TOOBA deep excavation project was conducted in a densely developed area in the North West of Tehran, capital of Iran, to provide space for 4 basement levels for multiple buildings around the already functional TOOBA tower. Besides excavating on 3 sides of TOOBA tower, this project involved excavation to the depths varying from 9 to 28 meters depending on the sloping ground condition. A 5 story school building and a 2 story residential building abut the excavation boundary. Previous experience of constructed soil nail walls in cemented soils of Tehran indicated relatively small wall deformations. Therefore, except for the retaining system of the TOOBA tower, a soil nail wall system was seen appropriate for supporting excavation faces. Wall and ground deformations were monitored during and after construction and the ground around the site was regularly checked for tension cracks. Geotechnical explorations indicated the presence of a disturbed fill about 5 meters thick overlaying the intact cemented soil layer. In the 29th of August 2011 following a three-day rainfall a tension crack suddenly occurred on the eastern side of the excavation site. The maximum width of the crack at the surface of the road was 3 cm. This paper summarizes the information on the forensic study which concluded that the rainfall was confined to the fill layer. Therefore drainage system which was located in the cemented soil layer with lower permeability could not function properly. Limit equilibrium analysis correctly predicted the location of the tension crack and the unstable block.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
7th Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2013 Missouri University of Science and Technology, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Haeri, S. Mohsen; Sasar, Mohammadhasan; and Afshari, Kioumars, "Accumulation of Rainfall in the Permeable Fill Behind a Soil Nail Wall" (2013). International Conference on Case Histories in Geotechnical Engineering. 3.
https://scholarsmine.mst.edu/icchge/7icchge/session03/3
Accumulation of Rainfall in the Permeable Fill Behind a Soil Nail Wall
Chicago, Illinois
TOOBA deep excavation project was conducted in a densely developed area in the North West of Tehran, capital of Iran, to provide space for 4 basement levels for multiple buildings around the already functional TOOBA tower. Besides excavating on 3 sides of TOOBA tower, this project involved excavation to the depths varying from 9 to 28 meters depending on the sloping ground condition. A 5 story school building and a 2 story residential building abut the excavation boundary. Previous experience of constructed soil nail walls in cemented soils of Tehran indicated relatively small wall deformations. Therefore, except for the retaining system of the TOOBA tower, a soil nail wall system was seen appropriate for supporting excavation faces. Wall and ground deformations were monitored during and after construction and the ground around the site was regularly checked for tension cracks. Geotechnical explorations indicated the presence of a disturbed fill about 5 meters thick overlaying the intact cemented soil layer. In the 29th of August 2011 following a three-day rainfall a tension crack suddenly occurred on the eastern side of the excavation site. The maximum width of the crack at the surface of the road was 3 cm. This paper summarizes the information on the forensic study which concluded that the rainfall was confined to the fill layer. Therefore drainage system which was located in the cemented soil layer with lower permeability could not function properly. Limit equilibrium analysis correctly predicted the location of the tension crack and the unstable block.
