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This document presents state-of-the-practice information on the design and installation of cement-grouted ground anchors and anchored systems for highway applications. The anchored systems discussed include flexible anchored walls, slopes supported using ground anchors, landslide stabilization systems, and structures that incorporate tiedown anchors. This document draws extensively from the FHWA-DP-68-IR (1988) design manual in describing issues such as subsurface investigation and laboratory testing, basic anchoring principles, ground anchor load testing, and inspection of construction materials and methods used for anchored systems. This document provides detailed information on design analyses for ground anchored systems
This book presents state-of-the-practice information on the design and installation of cement-grouted ground anchors and anchored systems for highway applications. The anchored systems discussed include flexible anchored walls, slopes supported using ground anchors, landslide stabilization systems, and structures that incorporate tiedown anchors. This book draws extensively in describing issues such as subsurface investigation and laboratory testing, basic anchoring principles, ground anchor load testing, and inspection of construction materials and methods used for anchored systems. This book provides detailed information on design analyses for ground anchored systems. Topics discussed include selection of design earth pressures, ground anchor design, design of corrosion protection system for ground anchors, design of wall components to resist lateral and vertical loads, evaluation of overall anchored system stability, and seismic design of anchored systems. Also included in this book are two detailed design examples and technical specifications for ground anchors and for anchored walls.
The long-term behavior of a ground anchor helps in evaluating the performance of the anchor as per design principles. The distribution of the applied load along the length of an anchor and its development with time presents a coherent representation of the functioning of the anchor. Due to the limited availability of these studies and with regard to the influence of the local geology on the behavior of the anchor, this study attempts to address this issue for the Kope shale bedrock formation. Due to high landslide susceptibility of the hillslopes along the Ohio river, the ground anchors are typically used for landslide stabilization. The current study involves evaluation of the various design parameters of importance. Due to various interaction surfaces and their complex relationships, the strain gage data collected from the anchors compensate for the limitations in accurately modeling the anchor behavior. Due to the absence of any experimental procedures in evaluation of the bond stresses along the tendon-grout and grout rock interface, the load transfer date calculated across the anchor provides a descriptive model of the interface interactions. The shaft displacement data calculated acknowledges the non-uniformity in the bond stress distribution along the length of the anchor and aids in evaluating the current design principles and predicting a model for the behavior of the anchor accurately. The anchor strains, load cell readings, load transfer and shaft displacement along the length of the anchor are evaluated and presented along with the strain gage readings.
This volume presents the proceedings of the first major international conference for over twenty years on the state-of-the-art of ground anchorage technology. Practical issues relating to construction and installation of anchorages are considered in a series of examples of engineering projects from around the world.
Anchoring in Rock and Soil