Civil Engineering Association

State of the Practice in the Design of Tall, Stiff, and Flexible Tieback Retaining Walls

Size: 7.65 MB | Format: PDF | Publisher: U.S. Army Corps of Engineers | Year: 2001 | pages: 253

Tieback walls are often used for temporary support of excavations in cases where it becomes necessary to limit the area of the excavation in order to protect highways, railroads, structures, and other important man-made features that are located immediately adjacent to the excavation. In some instances the tieback wall system will remain as a permanent structure. Permanent tieback wall systems are used as guide walls and approach walls on navigation projects, and as retaining walls on highway and railroad protection and relocation projects. The structural design of tieback wall systems involves
• Selection of appropriate design and performance standards.
• Determination of the loadings and loading combinations to be used for design.
• Design of wall structural features such as tiebacks, soldier beams, wales, lagging, and facing systems.
• Detailing of all structural features to meet safety requirements and constructibility requirements.
• Selection of appropriate contract specifications to ensure that the completed structure meets all strength and serviceability requirements and provides corrosion protection suitable for the intended service life of the wall.
The state of the practice with respect to the design and evaluation of tieback wall systems is covered by this report. It is important to recognize that the subject matter covered herein is presented only as background information as to the state of the practice and as such is not in any way intended to represent Corps design guidance. No endorsement of the procedures described herein is implied or intended. The state of the practice will be illustrated with respect to the design and evaluation of five tieback wall systems. The systems selected (listed on following page) are described in detail in Chapter 2.
• Vertical sheet-pile system with wales and post-tensioned tieback anchors.
• Soldier beam system with wood or reinforced concrete lagging and posttensioned tieback anchors. For the wood-lagging system, a permanent concrete facing system is required.
• Secant cylinder pile system with post-tensioned tieback anchors.
• Continuous reinforced concrete slurry wall system with post-tensioned tieback anchors.
• Discrete concrete slurry wall system (soldier beams with concrete lagging) with post-tensioned tieback anchors

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State of the Practice in the Design of Tall, Stiff, and Flexible Tieback Retaining Walls

The work described in this report was authorized by Headquarters, U.S. Army Corps of Engineers (HQUSACE), as part of the Innovations for Navigation Projects (INP) Research Program. The work was performed under Work Unit 33272, "Soil-Structure Interaction Studies of Walls with Multiple Rows of Anchors."
Dr. Tony C. Liu was the INP Coordinator at the Directorate of Research and Development, HQUSACE; Research Area Manager was Mr. Barry Holliday, HQUSACE; and Program Monitor was Mr. Mike Kidby, HQUSACE. Mr. William H. McAnally of the U.S. Army Engineer Research and Development Center (ERDC) Coastal and Hydraulics Laboratory was the Lead Technical Director for Navigation Systems; Dr. Stanley C. Woodson, ERDC Geotechnical and Structures Laboratory (GSL), was the INP Program Manager. This report was prepared by Mr. Ralph W. Strom, Portland, OR, and Dr. Robert M. Ebeling, ERDC Information Technology Laboratory (ITL). The work was monitored by Dr. Ebeling, Principal Investigator for INP Work Unit 33272, under the supervision of Mr. H. Wayne Jones, Chief, Computer - Aided Engineering Division, ITL; Mr. Tim Abies, Acting Director, ITL; and Dr. Michael J. O'Connor, Director, GSL.
At the time of publication of this report, Dr. James R. Houston was Director of ERDC, and COL John W. Morris UJ, EN, was Commander and Executive Director.

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