Numerical and Analytical Investigation of Ground Surface Settlement Due to Subway Excavation

摘要: In the congested urban areas, tunnelling close to existing structures often occurs due lack of space. Consequently, tunnelling-induced ground movements may cause serious damage adjacent structures. Ground surface settlement caused by tunnel excavation varies in magnitude and trend depending on several factors such as geometry, conditions, etc. There are emp irical, semi-emp irical equations numerical methods available estimateground associated with activit ies, however among these most empirical based do not simu ltaneously take all relevant co mplex condition into account. comp lex can be used for resulting accurate predictions. this paper, movement a highly populated region Iran's capital city, Tehran, induced construction 7 th line Tehran subway has been investigated. It was aimed analyse displacements which hasbeen using Earth Pressure Balance-Shield Tunnel Boring Machine. The analysis performed Finite difference Method (FDM) FLA C 3D FDM package. Results from nu merical show good agreement obtained results fro m analytical methods. addition, effect o f some impo rtant geometry properties Obtained indicate that is more sensitive rather than height placement.