Location

Chicago, Illinois

Session Start Date

4-29-2013

Session End Date

5-4-2013

Abstract

A-Wall systems are a combination of deep foundations and, in some cases, tiebacks used to provide lateral support to an unstable ground mass. Determination of the lateral and vertical forces acting on an A-Wall system can be a complex endeavor. As the unstable soil mass tends to move past and through the A-Wall system, forces are generated between the A-Wall elements and the soil. These forces provide support to the ground mass. If the A-Wall is correctly designed, the forces will increase as the soil moves until a maximum is attained at which ground movement ceases and the system reaches equilibrium. Design of an A-Wall thus requires Soil-Structure Interaction (SSI) analyses that provide a solution that meets force and moment equilibrium as well as compatibility of displacements. The individual elements of the A-Wall are designed based on a structural analysis utilizing the estimated forces. This paper describes the philosophy of design of A-Walls. It also contains a detailed description of design steps based on the use of a commercially available computer program that allows determination of soil forces against a deep foundation element installed through a mass of moving soil. An iterative method is presented to find a solution to the A-Wall problem that meets equilibrium and compatibility and considers material nonlinearity of soils and A-Wall components, as well as geometric nonlinearity of the deep foundation elements. Two case histories are presented.

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

Design of A-Walls for Stabilization of Slopes and Embankments in Soft Soils

Chicago, Illinois

A-Wall systems are a combination of deep foundations and, in some cases, tiebacks used to provide lateral support to an unstable ground mass. Determination of the lateral and vertical forces acting on an A-Wall system can be a complex endeavor. As the unstable soil mass tends to move past and through the A-Wall system, forces are generated between the A-Wall elements and the soil. These forces provide support to the ground mass. If the A-Wall is correctly designed, the forces will increase as the soil moves until a maximum is attained at which ground movement ceases and the system reaches equilibrium. Design of an A-Wall thus requires Soil-Structure Interaction (SSI) analyses that provide a solution that meets force and moment equilibrium as well as compatibility of displacements. The individual elements of the A-Wall are designed based on a structural analysis utilizing the estimated forces. This paper describes the philosophy of design of A-Walls. It also contains a detailed description of design steps based on the use of a commercially available computer program that allows determination of soil forces against a deep foundation element installed through a mass of moving soil. An iterative method is presented to find a solution to the A-Wall problem that meets equilibrium and compatibility and considers material nonlinearity of soils and A-Wall components, as well as geometric nonlinearity of the deep foundation elements. Two case histories are presented.