Influence of installation effects on the performance of laterally loaded pile groups
Influence of installation effects on the performance of laterally loaded pile groups
A profound knowledge of the performance of laterally loaded piled foundations is important for the assessment of critical infrastructure which is mostly founded on deep foundations and which to an increasing extend has to resist lateral loads resulting from structures, variable loads and geohazards. An in-depth understanding of the performance of piled foundations due to lateral loading is relevant for the reliable design of new structures and for the assessment of the stability and serviceability of existing infrastructure. Available investigations on laterally loaded pile groups and current empirical or analytical methods mainly focus on bored piles. Opposite to that, there is very limited knowledge about the performance of full displacement pile groups although it can be expected that their behaviour is significantly influenced by the installation effects, like the change of stress-state and soil density. For realisation, tests on groups of 9 piles, installed as bored-piles and as full-displacement piles, are performed at Deltares Centrifuge, to quantify the impact of installation effects on the lateral load-displacement behaviour of the pile groups. Therefore, the horizontal soil pressure was measured directly on the pile surface by small earth pressure cells. The pile installation and the loading were executed during spinning, enabled by an innovative experimental system. In the paper based on a state-of-art assessment of the design of laterally loaded pile groups, the concept and the results of the centrifuge tests are analysed demonstrating the characteristic differences between bored and displacement piles.
Tobias Schlager; Christian Moormann; H. Schiewe
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
A - New developments on structural design
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