摘要
西藏高原地区存在大范围的冻土区域,因而研究该区域冻土对土石坝结构抗震安全性能的影响尤为必要。根据高寒区深覆盖层西藏旁多土石坝工程结构参数建立三维仿真分析模型,采用无限元法模拟无限地基辐射阻尼效应,通过渗流场和温度场分析确定出坝体-坝基冻土所在区域。采用等效线性方法计算分析不同工况下考虑冻土、不考虑冻土的结构动力特性和抗震性能,结果表明冻土的存在对土石坝结构动力特性和抗震性能均产生了一定的影响。
There is a large area of permafrost in Tibet plateau region,so it is necessary to study the influence of permafrost on seismic safety performance of earth rockfill dam structure.Based on the structural parameters of earth rockfill dam in Tibet Pangduo,the three-dimensional simulation model was established.The radiation damping effect of the infinite foundation was simulated by using the infinite element method.The frozen soil range of the dam body and foundation was determined by the analysis of seepage field and temperature field.The equivalent linear method was used to analyze the dynamic characteristics and seismic performance of the structure under different working conditions with or without considering the frozen soil.The results show that the existence of frozen soil has a certain influence on the dynamic characteristics and seismic performance of the structure of the earth rockfill dam.
作者
胡锦
郭永刚
吴悦
HU Jin;GUO Yong-gang;WU Yue(College of Water Conservancy and Civil Engineering,Tibet Agriculture and Animal Husbandry University,Nyingchi 860000,China)
出处
《水电能源科学》
北大核心
2020年第6期96-99,共4页
Water Resources and Power
基金
水沙科学与水利水电工程国家重点实验室开放基金(sklhse-2015-D-01)
西藏自治区重点科研计划项目(2016XZ01G30)
西藏农牧学院研究生创新计划资助项目(YJS2018-04)。
关键词
非线性动力分析
深覆盖层土石坝
冻土
无限元法
nonlinear dynamic analysis
deep overburden earth rockfill dam
frozen soil
infinite element method
