多折点折线形混凝土面板堆石坝三维有限元分析

Three-dimensional finite element analysis of concrete faced rockfill dam with multi-fold point

对坝轴线呈连续多折点的折线形面板堆石坝进行了分析,探讨了应力变形特性和规律,比较了其与普通直线型面板坝的差异.基于某多折点凸向下游的折线形面板堆石坝,采用三维有限元软件建立坝体模型和面板子模型,分析了坝体和面板的应力变形、结构缝变形与折线体型的关系以及上宽下窄的异型面板对面板应力的影响.研究结果表明:坝轴线折线形布置,相邻面板形成坝轴向交角,使得转折部位面板轴向应力由高压应力转为低压应力甚至拉应力,面板垂直结构缝由压性缝转变为张性缝;上宽下窄的异型面板使得面板底部顺坡向拉应力分布范围增大.

On the basis of analysis, the stress and deformation characteristics and laws of the concrete faced rockfill dam with continuous multiple fold points on the axis of the dam are discussed: and the difference between the dam and the ordinary straight axis type concrete faced dam is discussed. Based on a concrete faced rockfill dam with multi-fold point, the dam body model and slab model are established by three-dimensional finite element software. The nonlinear relationship between the fold line type and the stress and deformation of the dam and the slab, the deformation of the structural joint is analyzed;and the influence of the wide top and narrow bottom special-shaped slab on the stress of the slab is analyzed. The results show that the fold line axis of the dam is arranged and the adjacent slab forms the axial intersection angle, which makes the axial stress from the high compressive stress to the low compressive stress or even tensile stress;and the vertical structural joints of the slab are transformed from the compressive joints to the tensile joints;and the special-shaped slab with wide top and narrow bottom increases the distribution range of the tensile stress at the bottom of the slab.