摘要
高堆石坝在强震作用下的破坏大多从坝顶开始,为提高坝体的抗震稳定性,在坝顶区域采取加筋技术是目前高堆石坝抗震的主要手段。采用有限元软件,对300 m级高粘土心墙堆石坝进行静动力分析,考虑在坝顶堆石区域分别铺设不同间距的土工格栅对坝体产生的影响,对比了地震作用下采取不同加筋方案的时程安全系数。结果表明,从动位移、响应加速度的角度来看,铺设土工格栅后能够提升坝体的抗震性能。在坝顶区域采取加筋措施能有效提高坝坡的稳定性,铺设间距为3 m时,坝坡安全评价指标提升效果最为明显,铺设间距从3 m缩短至2 m时,变化趋势不大,因此将土工格栅铺设间距为3 m视为最优方案。
The damage of high rockfill dams under strong earthquakes mostly starts from the dam crest.In order to improve the seismic stability of the dam,the use of reinforcement technology in the dam crest area has become the main method of earthquake resistance for high rockfill dams.Using finite element software,a static and dynamic analysis of a 300 m-level high-clay core rockfill dam was carried out.The impact of laying different spacing of geogrids on the dam in the rockfill area of the dam crest was considered.Time-history safety factors with adopting different reinforcement schemes were compared under the action of earthquake.The results show that from the perspective of dynamic displacement and response acceleration,laying geogrids can improve the seismic performance of the dam.Reinforcing measures in the dam crest area can effectively improve the stability of the dam slope.When the laying spacing is 3 m,the improvement effect of the dam slope safety evaluation index is the most obvious.As the laying spacing is shortened from 3 m to 2 m,the safety factor changes little.When the grid spacing is 3 m,it is regarded as the best solution.
作者
胡圣明
王铭明
汪晨
于浩
王睿齐
HU Sheng-ming;WANG Ming-ming;WANG Chen;YU Hao;WANG Rui-qi(Faculty of Electric Power Engineering,Kunming University of Science and Technology,Kunming 650500,China)
出处
《水电能源科学》
北大核心
2021年第12期104-107,50,共5页
Water Resources and Power
基金
国家自然科学基金项目(51969010)。
关键词
土工格栅
堆石坝
抗震分析
有限元法
安全系数
geogrid
rockfill dam
seismic analysis
finite element method
safety factor
作者简介
胡圣明(1995-),男,硕士研究生,研究方向为水工结构抗震,E-mail:348632147@qq.com;通讯作者:王铭明(1982-),男,博士、教授,研究方向为水工结构抗震,E-mail:wang.ming.ming@163.com。
