Effect of Construction Sequence on Adjacent Underground Structures
Senior Geotechnical Engineer
M. Sherif Aggour
Daniel P. O’Connell
Karl E. Suter
Richard E. Finnen, Jr.
Kevin C. Miller
Planned construction in urban areas often involves razing of the existing site structures, a large amount of unloading due to excavations, increased load due to construction dewatering, and development of new mid to high rise structures. If not performed in a proper sequence, these construction procedures can trigger stress changes on underground structures, such as transit tunnels, etc. They can also create a large amount of displacement in adjacent underground structures.
Considerable research has been undertaken to assess the effect of tunnel construction on adjacent structures, but little literature exists regarding the effect of above ground construction on existing underground structures. In this study, a construction sequence is modeled using a series of Finite Element analyses to study the induced stress and displacement on an underground structure. The results showed that the process of excavation and dewatering can be balanced to produce minimum stress and displacement on the underground structure.
Keywords: finite element analysis, PLAXIS, tunnel, stress analysis, construction sequence, constitutive modeling
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