Location

New York, New York

Session Start Date

4-13-2004

Session End Date

4-17-2004

Abstract

Protection of deep excavation by cast in situ concrete diaphragm walls for Shopping Center in Gdansk (Poland) is described. The structure was designed as five-storey-building with three additional underground floors and founded on diaphragm walls. The excavation was made by “half-floor” method with temporary supports of floor in the form of steel columns. Static calculations of excavation bracing were carried out by PLAXIS numerical code for both design stage (for two calculation schemes: anchored and supported by floor ring) as well as after its construction (back analysis). The calculations served for an assessment of predicted wall displacements, deformations of soil surface around the excavation and internal forces in subsequent stages of the excavation deepening and for different working schemes (supports) of the construction. During construction works vertical displacements of the soil surface around the excavation and surrounding buildings as well as horizontal displacements of diaphragm walls were monitored and compared with the results of corresponding calculations. Some exemplary distributions of calculated and measured values of the wall and soil surface deformations are presented. Subsoil unloading effects and the range of impact zones on the vicinity are also analyzed.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Fifth Conference

Publisher

University of Missouri--Rolla

Publication Date

4-13-2004

Document Version

Final Version

Rights

© 2004 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 13th, 12:00 AM Apr 17th, 12:00 AM

Deep Excavation Braced by Diaphragm Wall in Gdańsk (Poland)

New York, New York

Protection of deep excavation by cast in situ concrete diaphragm walls for Shopping Center in Gdansk (Poland) is described. The structure was designed as five-storey-building with three additional underground floors and founded on diaphragm walls. The excavation was made by “half-floor” method with temporary supports of floor in the form of steel columns. Static calculations of excavation bracing were carried out by PLAXIS numerical code for both design stage (for two calculation schemes: anchored and supported by floor ring) as well as after its construction (back analysis). The calculations served for an assessment of predicted wall displacements, deformations of soil surface around the excavation and internal forces in subsequent stages of the excavation deepening and for different working schemes (supports) of the construction. During construction works vertical displacements of the soil surface around the excavation and surrounding buildings as well as horizontal displacements of diaphragm walls were monitored and compared with the results of corresponding calculations. Some exemplary distributions of calculated and measured values of the wall and soil surface deformations are presented. Subsoil unloading effects and the range of impact zones on the vicinity are also analyzed.