The Deep Foundations Institute (DFI) has just published a new report entitled “Guidance for Factoring Deep Foundation Structural Resistance for Landslide Stabilization and Excavation Support“, Final Report, CPF-2017-LAND-1 . The authors are our very own Ben Turner, Dan Ding, Erik Loehr, and Paul Axtell.
To borrow from the authors’ introduction:
This report provides guidance for factoring deep foundation passive structural resistance for use in two-dimensional limit-equilibrium SSA, and is intended to serve as a consensus document on this subject. The report is divided into two main sections. The first section provides an overview of the basic framework for incorporating deep foundation elements into global stability analyses, followed by a discussion of the different possible methods for factoring (or not) structural resistance at different stages of the analysis. From this discussion, various plausible combinations of methods for including or not including load and resistance factors are identified, including a simple example. In the second section of the report, the various factoring methods are applied to three case studies in order to analyze the influence of factoring method on reliability. The report concludes with a summary of the recommended approach for incorporating deep foundation resistance in SSA, informed by the conclusions presented in the earlier sections.
The report can be downloaded for free from DFI at the Committee Project Fund page (https://www.dfi.org/cpf) . Scroll down and look for the Landslides and Slope Stabilization Committee. The DFI committees fund a lot of projects that result in reports such as this that benefit our industry and the state of practice.
While the report is free, you can access so much more, including the DFI Journal, by becoming a member.