Centrifuge modelling of wave-seabed-tunnel interaction using a hydraulic-driven type wave maker
Centrifuge modelling of wave-seabed-tunnel interaction using a hydraulic-driven type wave maker
Waves present a significant threat to the stability of submarine pipes. To investigate wave-seabed-pipe interactions, a hydraulic-driven inflight wave maker device has been developed. This device is capable of generating regular periodic waves in water depths of 0.3 m at 50g, with the maximum frequency of 10 Hz. It serves as the preliminary research apparatus for the "Wave, Tsunami, and Gravity Flow Modelling Device" within Chinas major scientific and technological infrastructure facility "Centrifugal Hypergravity and Interdisciplinary Experiment Facility (CHIEF)". A series of wave-loading tests were conducted on seabeds with varying over-consolidated ratios. The pore pressure of seabeds nearby and far-from the model pipe was measured during tests. The main findings are as follows: (1) The instability mechanism of clayey seabeds is triggered by the degradation of shear strength under dynamic loading, rather than by the excess pore pressure reaching the effective self-weight stress; (2) Over-consolidated seabeds exhibit greater resistance to deformation under equivalent wave compared to the normally consolidated seabeds; (3) The residual pore pressure around the pipe exhibits a symmetrical distribution with higher magnitudes at the bottom than at the crown. The oscillatory pore pressure amplitude shows a markedly different pattern, with significantly larger values on the wave-facing side than the leeward side.
Zhenyi Li; Xinhao Wang; Xingchao Chen; Bin Zhu; Deqiong Kong
11th International Conference on Physical Modelling in Geotechnics (ICPMG2026)
Session 6: Onshore and offshore foundation systems
https://doi.org/10.53243/ICPMG2026-154