堆石流变性对水布垭面板堆石坝性状影响的研究

摘要

以水布垭混凝土面板堆石坝为研究对象，采用考虑堆石料流变性的计算模型进行整体计算，分析堆石料流变变形对高面板堆石坝防渗系统的影响.结果表明，考虑堆石料流变性后，面板应力与接缝位移与常规分析所得结果有较大的差别：堆石流变性使面板坡向压应力增大，拉应力减小，使河谷部位面板轴向压应力增大，两岸拉应力增加；面板缝在河谷中部压紧值增加，两岸部位张开位移增加；周边缝错动位移进一步加大.面板坝设计中应对这些因素加以考虑.%Based on the 3-D FEM,the deformation of the Shuibuya concrete faced rock-fill dam is calculated by use of a rheological model.The differences between the deformation of the structure obtained in consideration of rheology of rockfill and that from conventional models are as follows: the slope compression stress of the slab increases and the slope extension stress decreases;however, the axial compression stress increases in the middle area,and the axial extension stress also increases near the abutment area.The compression displacement of slab joints in the middle area and the extension displacement near the abutment are enlarged. The shear displacement of perimeter joints is also enlarged. These differences should be considered in the design of the structure.