基于P2PSand模型的水库土石坝坝基地震液化影响分析
Effect Analysis of Seismic Liquefaction on Reservoir Earth-Rockfill Dam Foundations Based on Practical Two-surface Plastic Sand Model
牛金帝 1张西文 1吕颖慧 1邱宇 1扈萍1
作者信息
- 1. 济南大学 土木建筑学院, 山东 济南 250022
- 折叠
摘要
为了解决水库土石坝坝基地震液化导致严重坝体变形和边坡失稳等灾害,从而对水库土石坝长效安全运行造成严重威胁的问题,以某水库土石坝为例,利用有限差分软件FLAC3D 7.0 及其内置P2PSand模型(practical two-surface plastic sand model),对存在地震液化地基的水库土石坝进行地震动力响应分析.结果表明:地震强度与相对密实度对水库土石坝坝基地震液化趋势影响较大,超孔压比随着地震过程的进行而逐渐增大,增大幅度约为 10.46%;随着坝基地震液化程度的提高,坝体变形更明显,并且坝基边坡稳定性劣化.
Abstract
To solve the problem of serious dam body deformation,slope instability,and other disasters due to seismic liquefaction of reservoir earth-rockfill dam foundations thus posing a serious threat to long-term safe operation of reservoir earth-rockfill dams,taking a reservoir earth-rockfill dam as an example,finite difference software FLAC3D 7.0 and its built-in practical two-surface plastic sand model(P2PSand model)were used to analyze seismic dynamic responses of the reservoir earth-rockfill dam with a seismic liquefaction foundation.The results show that seismic intensity and relative compactness have a great influence on seismic liquefaction trend of the reservoir earth-rockfill dam foundation.The excess pore pressure ratio increases gradually with the seism process,and the increase is about 10.46% .With the increase of seismic liquefaction degree of the dam foundation,the deformation of dam body becomes more obvious,and the slope stability of the dam foundation decreases.
关键词
水库土石坝/地震液化/P2PSand模型/边坡稳定性Key words
reservoir earth-rockfill dam/seismic liquefaction/practical two-surface plastic sand model(P2PS and model)/slope stability引用本文复制引用
基金项目
国家自然科学基金项目(51708251)
国家自然科学基金项目(51979122)
山东省自然科学基金项目(ZR2023ME070)
中国博士后科学基金项目(2019M652304)
出版年
2024
NETL
NSTL
万方数据