Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

Abstract

After Hurricane Ivan made landfall in 2005, the Florida Department of Transportation required the replacement of two new high level multi-span bridges that carry Interstate I-10 across the Escambia Bay in Pensacola, Florida, USA. The project required widening an area under the existing pile-supported Scenic Highway abutments with limited headroom of approximately 15 feet. The Department required cutting back the concrete-faced slope pavement below the existing bridge abutment and installing a finished vertical wall facing that consisted of precast concrete panels rendering a look of a conventional Mechanical Stabilized Earth (MSE) wall. In order to gain space for the installation of the finished facing, it was necessary to perform a vertical cut at a location offset from the proposed finished wall face line. This 18-foot high temporary cut required excavation support, which was provided using an anchored flexible-facing wall. The facing consisted of welded wire mesh/geotextile combined with special mechanical plate anchors. The flexible facing for the temporary excavation support was utilized instead of a conventional soil nailed wall with reinforced shotcrete facing. A long-term tieback anchored soldier pile and lagging wall was installed in front of the temporary excavation support at a later time. Flowable fill was placed between the two walls before stressing and locking the long-term tieback anchors. The finished wall facing consisting of precast concrete panels that were attached to the steel soldier piles with specially designed connections. This paper presents the design approaches and construction of the temporary excavation support, and the long-term soldier pile and lagging wall with tieback anchors and precast concrete panels. Utilization of flexible facing elements to temporarily support and stabilized the vertical cut face was discussed. Advantages and disadvantages, and performance are also presented.

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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Design and Construction of Anchored Flexible Facing Excavation Support and Soldier Pile Wall

Arlington, Virginia

After Hurricane Ivan made landfall in 2005, the Florida Department of Transportation required the replacement of two new high level multi-span bridges that carry Interstate I-10 across the Escambia Bay in Pensacola, Florida, USA. The project required widening an area under the existing pile-supported Scenic Highway abutments with limited headroom of approximately 15 feet. The Department required cutting back the concrete-faced slope pavement below the existing bridge abutment and installing a finished vertical wall facing that consisted of precast concrete panels rendering a look of a conventional Mechanical Stabilized Earth (MSE) wall. In order to gain space for the installation of the finished facing, it was necessary to perform a vertical cut at a location offset from the proposed finished wall face line. This 18-foot high temporary cut required excavation support, which was provided using an anchored flexible-facing wall. The facing consisted of welded wire mesh/geotextile combined with special mechanical plate anchors. The flexible facing for the temporary excavation support was utilized instead of a conventional soil nailed wall with reinforced shotcrete facing. A long-term tieback anchored soldier pile and lagging wall was installed in front of the temporary excavation support at a later time. Flowable fill was placed between the two walls before stressing and locking the long-term tieback anchors. The finished wall facing consisting of precast concrete panels that were attached to the steel soldier piles with specially designed connections. This paper presents the design approaches and construction of the temporary excavation support, and the long-term soldier pile and lagging wall with tieback anchors and precast concrete panels. Utilization of flexible facing elements to temporarily support and stabilized the vertical cut face was discussed. Advantages and disadvantages, and performance are also presented.