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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。
Aiming at the problem of irregular section of the dam and the problem of meshing at the junction, the finite element meshing program is compiled and improved. The generalized Hooke’s law is used to represent the constitutive relation. ADINA, Three-dimensional finite element numerical simulation is carried out for the main dam of the reservoir. The stress and deformation of overflow and non-overflow dam under different conditions are calculated and analyzed. The results show that the maximum compressive stress of non-overflow dam section appears at the bottom of dam foundation. The maximum compressive stress of overflow section generally appears at the downstream dam site. The maximum tensile stress occurs at the upstream dam heel of non-overflow dam section Or at the tip of the overflow dam. The maximum horizontal displacement and vertical maximum settlement all appear at the overflow dam section of the check water level, and the settlement amplitude of the non-overflow dam section is larger than the settlement amplitude of the overflow dam section. The stress and deformation of the dam body conform to the general laws of the gravity dam as a whole, but a larger tensile stress zone appears in the upstream overflow dam section, and the seepage control facilities should be properly increased.