Abstract
Underground structures play an important role in achieving the requirements of rapid urban development such as tunnels, parking garages, facilities, etc. To achieve what is needed, new transportation methods have been proposed to solve traffic congestion problems by using of high-speed railway and subway tunnels. One of the issues in urban spaces due to tunnel excavation is considerable surface settlements that also induce problems for surface structures. There are a variety of published relationships concerned with field measurements and theoretical approaches to evaluating the amount of the maximum surface settlement value due to tunneling. This paper studies the ground surface settlement caused by the Greater Cairo Metro – Line 3 - Phase-1. This project was constructed by a slurry shield Tunnel Boring Machine (TBM). Therefore, this work consists of two parts. The first part presents the details of the project and monitoring results field and laboratory geotechnical investigations in order to determine the soil properties. The second part is to the comparison between the field measurements and theoretical approaches for surface settlement due to tunneling construction. At the end of the works, the results show that the more convenient methods which approach the field measurements, and the major transverse settlement occurs within the area about 2.6 times the diameter of the tunnel excavation. Doi: 10.28991/cej-2020-03091617 Full Text: PDF
Highlights
Underground structures play an important role in achieving the requirements of rapid urban development such as tunnels, parking garages, facilities, etc
It's found there is consistent with soil description but difference with the level of depth
Limaniv (1957) [37] has presented the theoretical methods proceed from the assumption of elastic behavior of the soil surrounding the tunnel to calculate the surface settlement resulting from the construction of tunnels or mine excavations
Summary
Underground structures play an important role in achieving the requirements of rapid urban development such as tunnels, parking garages, facilities, etc. The construction of tunnel induces ground movements, both vertical and lateral, causing surface subsidence, curvature change, inclination, and discontinuous deformation, which in turn affect the safety and stability of adjacent existing buildings within the settlement range of strata, bringing potential safety obstacles to the building structures [2,3,4,5,6,7,8,9] It is well-acknowledged that the soil movement occurring during deep excavation process plays a significant role in this regard. The first part presents the details of the project and monitoring results field and laboratory geotechnical investigations in order to determine the physical soil properties of the site which helps in predicting the behavior of the soil and the settlement that occurring on adjacent El-Attaba Garage building due to construction of tunneling.
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