分区填筑标准对高心墙堆石坝坝体变形协调及安全性影响研究  

Research on the Impact of Filling Criterion on the Deforming Compatibility and Safety of the High Core Rockfill Dam

作　　者：宋宇 宁志远 刘慧 朱晟[2] SONG Yu;NING Zhi-yuan;LIU Hui;ZHU Sheng(Power China Huadong Engineering Co.,Ltd.,Hangzhou 310000,Zhejiang Province,China;Hohai University,Nanjing 210000,Jiangsu Province,China)

机构地区：[1]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122 [2]河海大学水利水电学院,江苏南京210098

出　　处：《中国农村水利水电》2023年第3期199-207,217,共10页China Rural Water and Hydropower

摘　　要：基于分区填筑相对密度指标,研究了某300 m级高心墙堆石坝坝体变形协调及安全性。对大坝进行三维弹塑性固结有限元分析,从坝体变形协调、心墙应力拱效应、水力劈裂和坝顶裂缝等方面评价了大坝安全。结果表明,盲目提高各分区填筑标准并不能使坝体各分区变形协调,而适当降低过渡区填筑相对密度、提高堆石区填筑相对密度,可使坝体变形从心墙到堆石区平稳过渡,同时减弱过渡区对心墙的拱托作用,有利于抗水力劈裂安全。采用Leonards法和有限元应变法判断了坝顶裂缝的开展,认为堆石区填筑相对密度过低是坝顶产生横向裂缝的必要条件。根据计算结果,提出了最有利于大坝安全的理论最优填筑方案,并建议了经济最优方案。Based on the criterion of filling relative density,the deforming compatibility and safety of a 300-meter high core rockfill dam are studied.Three-dimensional elastoplastic consolidation finite element analysis is carried out to evaluate the dam’s operational safety from the perspectives of deformation distribution,arching effect,hydraulic splitting and crest cracking.The results show that increasing the filling parameters of all zones blindly cannot improve the dam’s deforming compatibility.However,reducing the filling relative density of the transition zone appropriately and increasing that of the rockfill zone can induce a smooth transition of the dam settlement from the core wall to the rockfill shell.Meanwhile,weakening the arching effect of the transition zone on the core wall is beneficial to the dam safety against hydraulic splitting.The Leonards and finite element method are adopted to judge the cracks’development on the dam crest,and it is considered that too low filling relative density in the rockfill zone is one of the necessary conditions for transversal cracking.According to the results,the theoretical and economical optimal schemes for dam filling are suggested.

关 键 词：高心墙堆石坝 填筑标准 填筑相对密度 变形安全 

分 类 号：TV641[水利工程—水利水电工程]