高心墙堆石坝混凝土垫板应力分析及分缝设计

心墙堆石坝坝基混凝土垫板应力值较高，垫板有可能开裂而导致心墙与垫板接触渗流破坏。以高261.5 m的糯扎渡土质心墙堆石坝为模型，通过三维有限元计算分析，研究了高心墙堆石坝混凝土垫板的受力机理、应力分布规律及合理的分缝方式，得出垫板在顺坝轴线方向总体处于压应力状态而在垂直于坝轴线方向会出现明显拉应力，由此提出在反滤层与心墙交界部位及在顺坝轴线方向主动设置结构纵缝的工程措施，从而大幅降低垫板拉应力，避免了垫板开裂。

Stress Analysis and Pointing Joint Design of Concrete Tie Plate for High Core Rockfill Dam

The stress of concrete tie plate of core rockfill dam foundation is very high. The tie plate possibly cracks and leads to contact seepage failure. Taking the clay core rockfill dam of Nuozhadu as a model, three dimensional finite element method is used to study the stress mechanism, stress distribution law and reasonable pointing joint mode of concrete tie plate of high core rockfill dam. It concludes that the concrete tie plate is overall in compressive stress state along dam axis and obvious tensile stress in perpendicular direction of dam axis. So, it puts forward engineering measures to set structure longitudinal joint in the border part of inverted filter and core wall and in the direction of dam axis, which can reduce significantly the tensile stress of the tie plate and avoid cracking of the tie plate.