Keynote: Current Status of Global Geotechnical Research on Helical Anchors and Piles-PPT Presentation

PPT Presentation

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The presentation reviews the growth of global academic research on helical piles and anchors, noting that much of it is government-funded and often has limited industry input. Research uses numerical modeling, centrifuge testing, small-scale 1g models, and full-scale field tests. Laboratory methods offer controlled conditions but cannot fully reproduce real soil stresses; field tests are more realistic but costly and difficult to standardize.<br /><br />Recent work has focused largely on round-shaft, single- and double-helix piles, with many studies using small-scale models. Topics include load efficiency, installation behavior, grouted helical piles, continuous-thread micropiles, and group effects. Findings generally show that helix size, number and spacing, embedment, soil conditions, and installation speed affect capacity and installation torque. However, results also caution against relying on installation torque alone to predict capacity: torque factors vary with shaft type, soil, loading direction, diameter, length, and embedment.<br /><br />Important knowledge gaps remain, particularly in compression behavior, long-term creep and aging, slow or drained loading in clay, field performance of groups, and large-scale tests on larger shafts and helices. The presentation calls for well-documented field testing and research that separates the contributions of shaft resistance and helix bearing while controlling other variables. It also recommends studying sustained and slow loading, group effects, aging, and inclined anchors.<br /><br />The overall message is that research has advanced substantially, but industry needs better ways to guide research priorities and synthesize the growing body of published work.

Keywords

helical piles

anchors

academic research

numerical modeling

centrifuge testing

field tests

installation torque

helix size

group effects

compression behavior