不同基座高度对沥青混凝土心墙堆石坝受力特性的影响研究
Study of Influence of Different Base Heights on Mechanical Characteristics of Asphalt Concrete Core Dam
姚夏繁 1赵二峰 1娄一青2
作者信息
- 1. 河海大学水利水电学院,江苏 南京 210098
- 2. 温州市水利电力勘测设计院有限公司,浙江 温州 325000
- 折叠
摘要
为研究不同基座高度对沥青混凝土心墙坝受力特性的影响,采用邓肯-张 E-B模型作为坝体及心墙的本构模型,对大坝施工和蓄水过程进行模拟,并依据基座与心墙的高度关系拟定 5 种计算方案,对比不同基座高度下堆石体和心墙的受力特性.结果表明,基座越高,大坝堆石体竖向位移及第一、三主应力越小,而心墙第一、三主应力越大,竖向位移则随基座增高而减小.在此基础上,利用熵值法构建了基座影响定权模型,量化了基座高度变化对大坝不同部位的影响程度:基座高度变化对心墙的影响(权重 56.06%)最显著,建议工程设计和安全评价需要考虑基座高度发生变化时对心墙第一主应力状态的影响.研究成果可为沥青混凝土心墙堆石坝工程设计和施工提供参考依据.
Abstract
The influence of different base heights on the mechanical characteristics of asphalt concrete core dam is studied.The Duncan Zhang E-B model is used as the constitutive model of the dam body and core wall to simulate the dam construction and water storage process.Five calculation schemes are proposed according to the height relationship between the base and the core wall,and the mechanical characteristics of rockfill body and core wall under different base heights are compared.The results show that the higher the base,the smaller the vertical displacement,the first and third principal stresses of the dam rockfill body,and the larger the first and third principal stresses of the core wall,the smaller the vertical displacement will be with the increase of the foundation.On this basis,the entropy method is used to build a weight model of the foundation impact,and quantify the impact of the foundation height change on different parts of the dam.The impact of the foundation height change on the core wall(weight 56.06%)is the most significant.It is sugges-ted that engineering design and safety evaluation should consider the impact of the foundation height change on the first principal stress state of the core wall.The research results can provide reference for the design and construction of asphalt concrete core rockfill dam.
关键词
沥青混凝土心墙坝/心墙基座/有限元分析/熵值法Key words
asphalt concrete core dam/core wall base/finite element analysis/entropy method引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据