Student Paper Competition Winner: Analytical Model of In-Situ Root-Inspired Ground Anchor Actuation and Pullout-PPT Presentation

PPT Presentation

Pdf Summary

The presentation introduces an analytical model for root-inspired ground anchors (RIGAs), bio-inspired devices designed to resist pullout by expanding or actuating within the soil. The model aims to predict the forces acting on the anchor mechanism, support economical design, estimate installation conditions, and forecast pullout performance.<br /><br />The actuation analysis represents the anchor as an internally hinged frame divided into segments. For each segment, the model considers pressure, soil stress and friction, actuation angle, and penetration distance, and solves the associated equilibrium equations. Its design requirements include accounting for changing contact area and exterior soil stresses while relying on practical inputs.<br /><br />Separate soil-stress and friction models address soil properties and drained or undrained conditions. The friction approach also considers interface roughness and, for undrained soils, displacement rate and total displacement. The pullout framework draws on established analytical solutions for different anchor orientations, embedment depths, soil friction conditions, and grouting methods.<br /><br />The presentation outlines a procedure for combining actuation and pullout predictions and illustrates its application using soil data from the NGES Spring Villa site in Opelika, Alabama. The authors conclude that analytical modeling can help predict RIGA behavior during installation and pullout, supporting the design and evaluation of these ground anchors.

Keywords

root-inspired ground anchors

RIGA

bio-inspired anchoring

pullout resistance

soil stress model

friction model

actuation analysis

installation prediction

anchor design

ground anchor performance