Root-Inspired Ground Anchors: Prototype Field Installation and Load Testing-PPT Presentation

PPT Presentation

Pdf Summary

The presentation describes the development and field testing of Root-Inspired Ground Anchors (RIGAs), which adapt plant root-system forms to improve the efficiency of anchored earth-retention systems. Conventional anchors can be constrained by soil capacity, limited space, drilling conditions, equipment, and high labor and equipment costs. RIGAs aim to use branching “roots” and stress arching to increase resistance without relying solely on larger or more numerous anchors.<br /><br />The team developed a hinged expansion mechanism in which the anchor tendon provides the reaction force needed to open the roots. Their proof-of-concept field installation at Georgia Tech’s “Glade” site tested whether the mechanism could create the intended geometry in sandy soil and whether expansion could improve pullout capacity. The work included anchor installation, expansion, grouting in different sequences, and pullout testing.<br /><br />Installation was largely successful, and the field trials revealed practical design considerations, especially mechanism geometry and grouting sequence. Pullout results were encouraging: one tested configuration achieved a reported capacity increase of 75%. Peak load occurred at approximately 15 degrees of root expansion, and installation loads were similar to anchor capacity. Ultimate capacities were broadly similar across the tested RIGAs, while some showed a stiff response.<br /><br />Future work will use numerical modeling to predict installation stresses and pullout capacity, refine manufacturing of the anchor mechanism and centralizers, and test anchors installed vertically and sub-horizontally.

Keywords

Root-Inspired Ground Anchors

RIGAs

ground anchors

field testing

pullout capacity

stress arching

branching roots

anchored earth-retention

expansion mechanism

grouting sequence