大朝山水电站地下厂房区渗流场分析

用固定网格求解有自由面渗流问题的结点虚流量法和改进排水子结构技术对我国云南大朝山水电站地下厂房区渗流场进行了三维整体有限单元法分析研究。用罚因子优化反演法所得的计算域中17个岩体子域的渗透张量及部分水头边界条件参数进行了反演识别，其中突出了厂房区裂隙岩体的渗透非均匀性和各向异性的特点。用Darcy渗流量计算的等效结点流量法计算施工期及运行期的渗流量大小。结合工程的现拟渗控设计方案经多种工况的求解，较详细地综合分析了本电站地下厂房区的渗流场特性及方案的渗控情况与特点。

Analysis on the Seepage Field of Dachaoshan Underground Hydropower Station

In this paper the authors have analysed the seepage field in detail by means of combination procedureof the fixed mesh finite element method of nodal virtual seepage flux and improved drainage substructure technique. In this process, the seepage behaviour of all openings of the power house, surge tank, six headrace penstocks tunnels, tailrace tunnels, and fifteen drainage galleries arranged longitudinally and transversally in threelayers at different elevations are numerically simulated. Finally, on the basis of the present seepage control design scheme the behaviour of the seepage field are analysed in detail through calculations of a few possible operation conditions.