Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

Abstract

Near-surface groundwater levels and high flood levels associated with flooding events impose significant hydrostatic forces on subterranean parking structures in Florida. Unique geologic conditions and the associated high hydraulic conductivities of the subsurface materials have precluded the use of conventional underdrain systems to provide hydrostatic relief. The case history presented here discusses the evaluation and repair of a subterranean parking garage of an existing office building that exhibited signs of distress including severe cracking of the ground floor slab, excessive quantities of water continuously seeping through these cracks and ponding water. Although various rehabilitation alternatives were evaluated, removal, replacement and re-design of the existing slab were chosen in order to provide additional tie-down restraint and implement a relatively maintenance-free, long-term solution. This paper briefly describes geologic conditions, the results of site-specific subsurface investigations, historical groundwater information, and various regional and local subterranean design alternatives. The design and construction aspects of the implemented anchored hydrostatic uplift slab system are presented, including: anchor installation, performance and proof testing, construction dewatering, waterproofing issues, and chemical grouting of joints.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Sixth Conference

Publisher

Missouri University of Science and Technology

Publication Date

8-11-2008

Document Version

Final Version

Rights

© 2008 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Evaluation and Repair of a Subterranean Parking Garage to Resist Hurricane Flood Levels

Arlington, Virginia

Near-surface groundwater levels and high flood levels associated with flooding events impose significant hydrostatic forces on subterranean parking structures in Florida. Unique geologic conditions and the associated high hydraulic conductivities of the subsurface materials have precluded the use of conventional underdrain systems to provide hydrostatic relief. The case history presented here discusses the evaluation and repair of a subterranean parking garage of an existing office building that exhibited signs of distress including severe cracking of the ground floor slab, excessive quantities of water continuously seeping through these cracks and ponding water. Although various rehabilitation alternatives were evaluated, removal, replacement and re-design of the existing slab were chosen in order to provide additional tie-down restraint and implement a relatively maintenance-free, long-term solution. This paper briefly describes geologic conditions, the results of site-specific subsurface investigations, historical groundwater information, and various regional and local subterranean design alternatives. The design and construction aspects of the implemented anchored hydrostatic uplift slab system are presented, including: anchor installation, performance and proof testing, construction dewatering, waterproofing issues, and chemical grouting of joints.