Investigation of the effect of local scour on piled bridge foundation performance using the hybrid modelling technique
Investigation of the effect of local scour on piled bridge foundation performance using the hybrid modelling technique
Scouring of piled foundations is a persistent hazard in bridge foundation design. The specific effect that scouring has on the stiffness and strength of such foundations is a source of significant uncertainty. The scour process is difficult to reproduce numerically, and the interaction between scouring, soil and structure is a complex phenomenon. This work describes the application of so-called hybrid modelling technique which is designed to address these issues by decoupling the hydraulic phenomenon from the investigation of the geotechnical performance. Real scoured soil profiles are produced in model tests, which are subsequently 3D scanned using a high-precision photogrammetry. Scan data is then processed and used to create a numerical calculation domain for finite element modelling. Model tests conducted using a specialised Miniaturised Tsunami Generator highlight in detail the scour patterns for single and two-by-one pile groups. Model preparation, construction and instrumentation as well as modelling considerations are presented and discussed. The method for scanning and processing these model results is presented along with a simple application to a single pile.
Liam Jones; I. Anastasopoulos
5th European Conference on Physical Modelling in Geotechnics (ECPMG2024)
New facilities, new equipment, measuring techniques
https://doi.org/10.53243/ECPMG2024-120
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