Impact-Induced Liquefaction of Desaturated Marine Soils and Dynamic Behaviour of Coral Sand

PhD student (SA-Res)

Qiongting Wang

Supervisors

Prof Yumin Chen (Hohai University)	Prof Yinghui Tian

Project Start Date: September, 2022

Project Details

With the rapid development of offshore infrastructure and large-scale marine reclamation projects, the dynamic stability and liquefaction resistance of reclaimed marine foundations have become critical concerns in offshore geotechnical engineering. Marine reclaimed soils are often loose and fully or nearly saturated, making them particularly susceptible to excess pore-water-pressure accumulation, strength degradation, and liquefaction under impact and other transient dynamic loads. My research focuses on the liquefaction mitigation mechanism of desaturated marine reclaimed ground, particularly the effects of partial saturation on stress-wave propagation, pore-pressure development, soil deformation, and energy dissipation. In parallel, I conduct Split Hopkinson Pressure Bar (SHPB) tests to investigate the dynamic mechanical behaviour of coral sand under high strain rates, with emphasis on strain-rate effects, particle breakage, and their influencing mechanisms. By combining laboratory experiments, theoretical analysis, and numerical modelling, this research aims to improve the understanding of the dynamic response of marine soils and provide guidance for the safe design of reclaimed foundations and coral-sand engineering structures under extreme loading conditions.