Location

Chicago, Illinois

Session Start Date

4-29-2013

Session End Date

5-4-2013

Abstract

The North Torrey Pines Road Bridge in Del Mar, California was built in 1933 and is eligible for listing in the National Register of Historic Places. As a result of its outdated design and deterioration in a corrosive saline environment, the bridge was classified as structurally and seismically deficient and functionally obsolete. The historic significance of this bridge is important to the surrounding community and thus a seismic retrofit project was initiated with the goal of improving the expected seismic performance of the bridge while preserving its aesthetic and historic character. This paper provides a brief description of the overall retrofit design strategy, and detailed descriptions of the design of compaction grouting ground improvement to mitigate liquefaction and seismic slope instability hazards. Techniques used in the compaction grouting construction are presented, along with some particular construction challenges and solutions. Pre- and post-construction Standard Penetration Test data are compared and the improvements to the soil are discussed. The compaction grouting program was successful in achieving the ground improvement levels required by the design.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Seventh Conference

Publisher

Missouri University of Science and Technology

Publication Date

4-29-2013

Document Version

Final Version

Rights

© 2013 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 29th, 12:00 AM May 4th, 12:00 AM

Compaction Grouting for Seismic Retrofit of the North Torrey Pines Bridge

Chicago, Illinois

The North Torrey Pines Road Bridge in Del Mar, California was built in 1933 and is eligible for listing in the National Register of Historic Places. As a result of its outdated design and deterioration in a corrosive saline environment, the bridge was classified as structurally and seismically deficient and functionally obsolete. The historic significance of this bridge is important to the surrounding community and thus a seismic retrofit project was initiated with the goal of improving the expected seismic performance of the bridge while preserving its aesthetic and historic character. This paper provides a brief description of the overall retrofit design strategy, and detailed descriptions of the design of compaction grouting ground improvement to mitigate liquefaction and seismic slope instability hazards. Techniques used in the compaction grouting construction are presented, along with some particular construction challenges and solutions. Pre- and post-construction Standard Penetration Test data are compared and the improvements to the soil are discussed. The compaction grouting program was successful in achieving the ground improvement levels required by the design.