CLOSING PLENARY: The Role of Compatibility in Deep Foundation Interface Performance-Video

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Video Summary

The keynote argues that geotechnical performance depends heavily on compatibility at interfaces—not just on the properties of the soil or structural material. Interfaces occur throughout testing and construction, from CPT sleeves and piles to anchors, geogrids, and thermal piles, yet they are often treated as weaker versions of soil rather than deliberately designed systems.<br /><br />Using simple particle models and experimental results, the speaker explains how surface roughness, material hardness, stress, temperature, particle shape, and loading direction affect sliding, rolling, dilation, and interface strength. These interactions can create opportunities to improve capacity beyond conventional assumptions. Examples include textured CPT sleeves, optimized aggregate–geogrid combinations, and root-inspired expandable anchors, which achieved roughly 75% greater pullout capacity than a conventional anchor of comparable length.<br /><br />The talk also advocates learning from nature. Snake-skin-inspired surfaces can provide direction-dependent resistance; spider-web structures have informed stronger geogrids; and plant structures suggest improved thermal pile designs. An engineered thermal transition zone, for example, produced substantially greater heat-transfer performance while allowing shorter systems.<br /><br />The speaker concludes that engineers should question standard designs, tailor interfaces to their materials and conditions, and use experimental, numerical, and visualization tools to develop more efficient, adaptable systems.

Keywords

geotechnical performance

interface compatibility

particle interaction

surface roughness

CPT sleeves

geogrids

thermal piles

biomimicry

pullout capacity