抽水蓄能电站三维渗流场有限元建模优化技术

Optimization Techniques of Three-dimensional Seepage FEM Modeling for Pumped Storage Power Station

建立抽水蓄能电站三维整体模型的重点在于协调走向各异的挡水坝段、合理布置纵横交错的洞室管道、准确反映关键地质不良体及精细刻画密集渗控措施。基于句容抽水蓄能电站系统构成及水文地质特性,从加速平面解码和优化三维网格生成技术两方面入手,对全断面节点对接技术进行优化改进,建立了多元地质结构分层条件下含密集排水孔幕的抽水蓄能电站三维渗流有限元模型。该模型不仅提高了建模效率,解决了原算法过于依赖网格的缺陷,同时三维网格兼灭和水平分层功能的实现,为施工填筑过程中应力计算提供了可行性。

The key points of modeling 3 Doverall models focus on the coordinating the dams with various dam axis directions,designing a reasonable layout for the crisscross cavern pipes,accurately reflecting the unfavorable geological body and depicting the densely distributed seepage control measures.Based on the functional sub-structures of Jurong pumped storage power station and the hydrogeological characteristics,this paper optimized the whole section node butt joint technique by accelerating the plane decoding module and automatic three-dimensional mesh generation module.The proposed algorithm can efficiently establish seepage finite element model with densely distributed drainage holes under multivariate geological structure.Moreover,this new method not only overcomes the problem of over-dependency on the grid for the existing algorithm,but also realizes the function of mesh mergence and horizontal stratification,providing an efficient technique for the stress and deformation calculation during the construction processes of excavation and filling.