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Iowa State University--Becoming the Best

DFI A-Wall Study


Principal investigator:

Co-principal investigator:

Project status

In progress

Start date: 04/01/16
End date: 12/31/16



About the research


A-walls are a slope stabilization technique involving a series of deep foundation elements installed in a failing or marginally stable slope using an A-shaped pattern of alternating inclinations. A-walls have been used to successfully stabilize several noteworthy slopes, but analysis of the walls is complicated by several complex load-transfer mechanisms. These complications have dissuaded engineers from using the promising approach.

The Deep Foundations Institute (DFI) has funded a study by the University of Missouri to improve analysis techniques for A-walls using computer code developed by the university. The MTC effort will be used to develop improved design practices for A-walls, which will be valuable for transportation agencies that face significant risks and costs associated with slope instability. The objective of this project is to develop improved design guidance for A-walls, which will be a valuable tool for departments of transportation (DOTs).