Centrifuge modelling on seismic response of layered clayey sand ground during earthquake swarms
Centrifuge modelling on seismic response of layered clayey sand ground during earthquake swarms
The frequent occurrence of major earthquake swarms worldwide has posed severe threats to geotechnical structures. This study investigates the dynamic response of layered clayey sand grounds subjected to earthquake swarm sequences through centrifuge model tests at 50g. Two models, with and without a surcharged block, are considered. The former model is designed to mimic the ground with large dam above it. Data acquisition primarily include quake-induced acceleration, excess pore pressure, and surface settlement. The mechanisms of soil dynamic behaviour and liquefaction potential under single strong-motion events and consecutive seismic events are analysed. The results demonstrate that the free ground liquefaction occurs alongside significant soil dilation. Consecutive strong motions induce continuous accumulation and escalation of excess pore pressure in the lower clayey layer. The surcharged block seems to exhibit suppressive effect on the excess pore pressure accumulation during shaking, and pore pressure dissipation after that. Notably, consecutive seismic events accelerate peak excess pore pressure generation in the foundation. These findings may help improve the seismic design of geotechnical structures in regions vulnerable to earthquake swarms.
Wenjing Liu; Lu Li; Junchao Li; Deqiong Kong; Bin Zhu
11th International Conference on Physical Modelling in Geotechnics (ICPMG2026)
Session 6: Onshore and offshore foundation systems
https://doi.org/10.53243/ICPMG2026-211