面板堆石坝垂直缝失效后集中渗流特性研究  

Study on Concentrated Seepage of Face Rockfill Dam After Vertical Joint Failure

作　　者：乔蓓 江德军 柳玉兰 QIAO Bei;JIANG De-jun;LIU Yu-lan(Laboratory and Equipment Management Department,Chengdu University,Chengdu 610106,China;Dadu River Basin Hydropower Development Co.,Ltd.,Chengdu 610000,China)

机构地区：[1]成都大学实验室与设备管理处,四川成都610106 [2]国能大渡河流域水电开发有限公司,四川成都610000

出　　处：《水电能源科学》2023年第4期123-126,共4页Water Resources and Power

基　　金：四川省科技计划重点研发项目(2021YFG0100)。

摘　　要：面板坝结构缝是大坝防渗体系的重要组成部分,也是最薄弱环节,其一旦失效对大坝安全影响巨大。以某面板堆石坝为例,运用有限元计算方法,对垂直缝失效位置、缝宽、缝长及垫层区渗透系数等典型特征进行模拟分析,分析了止水失效后渗流场规律及其渗透稳定性。结果表明,单缝失效时,垂直缝位置、缝宽、缝长及垫层渗透系数等与各渗流控制要素呈正相关,其中缝长及垫层渗透系数的相关性最显著;多缝同时失效时,开裂面板处流量可应用单缝失效结果求和计算而得,且结果偏于安全。同时,建议垫层渗透系数宜取1×10^(-5)m/s或略小。结果可为类似工程设计、施工提供参考。The structural joints of face rockfill dam are the most important part and the weakest link of the seepage control system of dams.Taking a face rockfill dam as an example,the position,width,length of vertical failure joints and permeability coefficient of cushion area were simulated by finite element method.And then the seepage field law and permeability stability after water stop failure were studied.The results show that in the case of single fracture failure,the position,width,length of fracture and permeability coefficient of cushion are positively correlated with control factors of seepage flow,and the length of vertical fracture and permeability coefficient of cushion are the most significant.When multiple joints fail simultaneously,the seepage flow at cracked panel can be calculated by summing the failure results of single joints,and the results are safety.At the same time,it is suggested that the permeability coefficient of cushion should be 1×10^(-5)m/s or slightly smaller.The results can vide pro-reference for the design and construction of similar projects.

关 键 词：面板堆石坝 垂直缝失效 裂缝 有限元 渗透稳定性 

分 类 号：TV223[水利工程—水工结构工程]