考虑水平层缝对锦屏高拱坝整体安全度的影响  

Global safety degree of Jinping high arch dam considering the impact of horizontal joint

作　　者：赵小莲[1] 张仲卿 杨仕升[2,3] 

机构地区：[1]广西大学材料科学与工程学院,广西南宁530004 [2]广西大学土木建筑工程学院,广西南宁530004 [3]广西壮族自治区地震局,广西南宁530022

出　　处：《广西大学学报（自然科学版）》2012年第6期1078-1082,共5页Journal of Guangxi University（Natural Science Edition）

基　　金：广西自然科学基金资助项目(桂科自0991063)

摘　　要：研究混凝土强度的不均匀性有两层意思,其一是水平施工缝降低层缝的抗拉强度,其二是混凝土本身的浇筑层面所形成的各项异性,这两种混凝土水平层缝在拱坝结构上都形成薄弱环节。针对拱坝真实受力状态,对拱坝所用的二级配混凝土材料成型的带水平层缝的混凝土试块进行了劈裂抗拉力学性能试验研究,试块尺寸为300 mm×300 mm×300 mm,试验比较了两种水平层缝的存在对本体和含层面试件的抗拉强度的影响。试验结果表明,水平施工缝和浇筑层面均使混凝土强度不均匀,产生各向异性,降低混凝土的抗拉强度。运用三维非线性有限元数值分析方法,确定锦屏高拱坝存在水平层缝的整体安全度。The objects two of studying the inequality of concrete intensity are the tensile strength of concrete bedding surface that is reduced by the horizontal construction joints and the anisotropy of the interfaces of the concrete itself. In order to investigate the constitutive relation of the horizontal joints, splitting tensile tests were conducted. The dimension of the specimens is 300mm×300mm×300mm. The results show that both horizontal construction joints and interfaces lead to anisotropy in concrete, weakening the tensile strength of concrete bedding surface. With 3D nonlinear finite element method, the global safety degree of Jinping high arch dam was studied under different failure models of the horizontal joint.

关 键 词：锦屏高拱坝 水平层缝 本构关系 整体安全度 

分 类 号：TV642.4[水利工程—水利水电工程]