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【Objective】 This study aims to reveal the dynamic response laws of hollow concrete dams under weak dam foundations and the influence mechanisms of key control parameters, providing a reference for seismic design of similar dams.【Methods】Based on shaking table test results, a numerical model reflecting pore pressure growth characteristics was established using PLAXIS finite element software, and the model accuracy and reliability were verified. The dam was proportionally scaled up to a height of 12 m, and the seismic dynamic responses of the dam under relatively weak and hard dam foundation conditions were compared and analyzed. Taking the foundation condition corresponding to the peak horizontal displacement of the dam as the benchmark, the effects of rockfill size behind the dam, transverse pile spacing, and foundation reinforcement depth were quantitatively studied. 【Results】(1) Compared with rigid dam foundation conditions, under weak dam foundations, the hollow concrete dam showed overall sliding deformation, with the most significant horizontal displacement response. The maximum dynamic displacement of the dam was 31.1 cm, and the residual horizontal displacement was 14.8 cm.(2) Under weak dam foundations, among various reinforcement measures, rockfill behind the dam had the most obvious restraint effect on dam horizontal displacement, followed by foundation reinforcement, while reducing transverse pile spacing had the weakest effect.(3) Considering the stress responses of the cut-off wall and piles, foundation reinforcement was the optimal scheme, and the reinforcement depth needed to penetrate the soil layer interface. 【Conclusions】 This study clarifies the action mechanisms of different foundation conditions and key parameters on the dynamic response of hollow concrete dams, and the conclusions can provide a reference for seismic design and foundation reinforcement of hollow concrete dams on soft foundations.
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Basic Information:
DOI：10.19760/j.ncwu.zk.2026052
China Classification Code:TV642
Citation Information:
[1]CHEN Zhuanzhuan,YANG Gui,LIU Luyang ,et al.Model Verification and Reinforcement Optimization of Hollow Concrete Dams[J].Journal of North China University of Water Resources and Electric Power(Natural Science Edition),2026,47(04):29-38.DOI:10.19760/j.ncwu.zk.2026052.
Fund Information:
国家自然科学基金项目(51479059)
2025-04-30
2025-04-30
2025-04-30