摘要
针对坝体不规则断面及其交界处的网格剖分难题,自编并改进了有限元网格剖分程序,采用广义胡克定律表示本构关系,利用大型有限元计算软件ADINA对威整水库主坝进行了三维有限元数值模拟,计算分析了不同工况下溢流坝段和非溢流坝段的应力及其变形规律。结果表明,非溢流坝段的最大压应力一般出现在坝基底部,溢流坝段的最大压应力一般出现在下游坝址处;而最大拉应力出现在非溢流坝段的上游坝踵处或溢流坝段的挑坎处。水平最大位移和竖向最大沉降量均出现在校核水位的溢流坝段处,且非溢流坝段的沉降幅度大于溢流坝段的沉降幅度。坝体的应力变形整体上符合重力坝的一般规律,但在上游溢流坝段出现了较大的拉应力区,应注意适当增加防渗设施。
For the problem about meshing the junction of different dam section and irregular section, the program of finite element mesh is programmed and improved. The generalized Hooke＇s law is used to denote constitutive relation. Large finite element analysis software ADINA is adopted to numerically simulate three-dimensional finite element analysis of the main dam of Weizheng reservoir. The results show that the maximum compressive stress generally appears at the bottom of non-overflow dam; for overflow segment, the maximum compressive stress generally appears at the downstream dam site; while the maximum tensile stress occurs in the non-overflow section upstream of the dam heel or at the flip bucket of overflow section; maximum horizontal displacement and the largest vertical settlement are in the overflow section of the check the water level, and the settlement of non-overflow section is greater than the magnitude of the overflow section of the settlement; the overall stress and deformation accord with the general rule of gravity dam; the upstream spillway section appears larger tensile stress area, attention should be paid to set appropriate cutoff facility.
出处
《水电能源科学》
北大核心
2014年第7期74-77,共4页
Water Resources and Power
关键词
三维有限元
浆砌石重力坝
应力
应变
three-dimensional finite element
masonry gravity dam
stress
strain
