Effect of Construction Sequence on Adjacent Underground Structures

 

Behzad Amir-Faryar

Senior Geotechnical Engineer
Professional Service Industries, Inc. (PSI)
2930 Eskridge Road, Fairfax, VA 22031
e-mail: bamirfaryar@nvcc.edu

M. Sherif Aggour

Professor
Department of Civil and Environmental Engineering
University of Maryland, College Park, MD 20742-3021

Daniel P. O’Connell

Principal Consultant
Professional Service Industries, Inc. (PSI)
2930 Eskridge Road, Fairfax, VA 22031

Karl E. Suter

Chief Engineer
Professional Service Industries, Inc. (PSI)
205 S. Battlefield Blvd. Suite 100 Chesapeake, VA 23322

Richard E. Finnen, Jr.

Principal Consultant
Professional Service Industries, Inc. (PSI)
5021-A West W.T. Harris Blvd., Charlotte, NC 28269

Kevin C. Miller

Chief Engineer
Professional Service Industries, Inc. (PSI)
8669 Olive Blvd., St. Louis, MO 63132

 

 ABSTRACT

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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