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

Video Transcription

Video Summary

The presentation introduces a root-inspired ground anchor designed to resist pullout using the soil-arching principles of fibrous plant roots. Installed in a drilled hole, the mechanism expands when a hydraulic ram pushes it open; grout then cures around it. Its expanded geometry may deliver comparable capacity with shorter bonded lengths than conventional tiebacks, reducing installation time and avoiding obstructions.<br /><br />The research develops analytical models to predict installation forces and pullout capacity. The actuation model accounts for changing geometry, soil stress and friction, and decreasing contact area as the anchor opens. Monte Carlo simulations represent soil variability and estimate installation reliability. Pullout capacity is estimated using existing solutions for plates and disks, adjusted for the anchor’s geometry.<br /><br />The speaker said the technology could enable reliability-based design and is moving toward commercialization. Questions addressed grout behavior, performance in different soils, installation limits, and anchor spacing. Tests suggest grout should be present during installation in granular soils for better contact and immediate capacity.

Keywords

root-inspired ground anchor

soil arching

pullout capacity

hydraulic expansion

grouted anchor

reliability-based design