Location
Chicago, Illinois
Date
01 May 2013, 5:15 pm - 6:45 pm
Abstract
Due to regulations requiring provision of car park in the typical multi-story buildings in the urban areas and the high cost of land, deep excavation adjacent to existing structures have become common-place in Iran. Limiting lateral as well as vertical displacement of the adjacent structures has proven to be a major geotechnical challenge especially in the coarse grained alluvium of Tehran where determination of geotechnical parameters is tedious. Often active temporary support methods such as "rigid pad – anchoring" and/or "anchored soldier piles" are used in combination with nailing. However, arriving at the optimum design for such projects for the sake of competitiveness in the typical "design-build" tenders is difficult due multiple choices as well as limited knowledge of geotechnical parameters. Hence accumulation data from case studies is deemed to be very useful. In this paper, details of a seventeen story building with 20m of excavation in the built-up region of Tehran are presented. The ground water level was initially found to be at the depth of 6m and it was required to lower the water table prior to excavation without any side effects. Rigorous monitoring and back analysis led to verification of geotechnical parameters as well as design model. The shortcomings of typical site investigations in case of coarse grained cemented soils as well as design procedures are outlined.
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
Rajabi, Mohammad Sharif and Kalantary, Farzin, "Deep Excavation in an Urban Area: A Case Study" (2013). International Conference on Case Histories in Geotechnical Engineering. 10.
https://scholarsmine.mst.edu/icchge/7icchge/session_07/10
Deep Excavation in an Urban Area: A Case Study
Chicago, Illinois
Due to regulations requiring provision of car park in the typical multi-story buildings in the urban areas and the high cost of land, deep excavation adjacent to existing structures have become common-place in Iran. Limiting lateral as well as vertical displacement of the adjacent structures has proven to be a major geotechnical challenge especially in the coarse grained alluvium of Tehran where determination of geotechnical parameters is tedious. Often active temporary support methods such as "rigid pad – anchoring" and/or "anchored soldier piles" are used in combination with nailing. However, arriving at the optimum design for such projects for the sake of competitiveness in the typical "design-build" tenders is difficult due multiple choices as well as limited knowledge of geotechnical parameters. Hence accumulation data from case studies is deemed to be very useful. In this paper, details of a seventeen story building with 20m of excavation in the built-up region of Tehran are presented. The ground water level was initially found to be at the depth of 6m and it was required to lower the water table prior to excavation without any side effects. Rigorous monitoring and back analysis led to verification of geotechnical parameters as well as design model. The shortcomings of typical site investigations in case of coarse grained cemented soils as well as design procedures are outlined.
