A Review of Medium- to Large-Scale Laboratory Testing Facilities for Soil-Pile Interaction-Paper

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The paper reviews medium- to large-scale facilities for physical testing of soil–pile interaction, presenting the Technical University of Darmstadt’s (TUDa) Geotechnical Test Pit and comparing it with similar facilities worldwide. The review is part of the EU-funded GEOLAB project, which links 11 research infrastructures to support collaborative research on soil–structure interaction and improve the resilience of critical infrastructure.<br /><br />The TUDa pit measures 19.5 by 5 metres and includes a 6-metre-deep section and a shallower 3-metre-deep section suitable for pile-group tests. It supports medium- to large-scale, and in some cases full-scale micropile, experiments—bridging the gap between small-scale laboratory work and costly field testing. Tests can use static or dynamic, vertical or horizontal loading. Models are generally prepared in sand by dry pluviation; piles may be driven, vibrated, or installed without displacement. A separate steel cylinder enables wet testing.<br /><br />The survey finds that facilities of comparable size are rare, largely because they require substantial space and investment. Most use sand and layer-by-layer placement and compaction, with varied pile-installation methods and broadly standard instrumentation. Some facilities offer specialized capabilities, while the Deltares soil–water flume can also investigate processes such as scour and sediment movement.<br /><br />The authors identify important development needs: better capacity to test clay, unsaturated soils, and temperature-dependent soil behaviour, all relevant to climate-related effects such as freeze–thaw, shrink–swell, and creep. They also emphasize international collaboration, since large-scale testing is expensive and facilities have complementary strengths. Coordinated near-full-scale experiments could improve understanding of soil–foundation interaction and validate numerical models and design methods. The effects of different pile-installation methods are highlighted as a promising topic for joint research.

Keywords

soil-pile interaction

geotechnical test pit

pile-group tests

large-scale testing

micropile experiments

soil-structure interaction

GEOLAB project

pile installation methods

instrumentation

foundation resilience