百色水电站地下厂房洞室群围岩渗流场分析

运用渗流场有限单元法求解的固定网格的结点虚流量法和排水孔排水子结构技术，并定义了溢流型排水孔、逸流型排水孔和排水孔开关器，在水力等效多孔隙介质渗流模型假定的基础上，能对工程复杂渗流场问题进行精细的求解。对广西百色水电站地下厂房洞室群围岩区的渗流场进行了多工况的三维计算，论证和分析了各洞室围岩区的渗流场特性，渗流场水头和引水隧洞衬砌外水压力分布的规律，以及防渗与排水设施渗控方案的合理性和还存在的缺点，并提出相应的改进意见。

Analysis of Seepage of Baise Underground Power Station

In the present paper, the authors have given the definitions of the overflow drainage hole,drainage hole with exit surface,and drainage hole switch. On the basis of the assumption of the hydraulic equivalence of the porous medium model and with the numerical method of nodal virtual flux and drainage substructure technique, the problems of the complicated seepage fields in engineering can be solved strictly. For the design of the seepage control scheme of Baise Underground Power Station, a few of different cases about the seepage field in the surrounding fractured rock masses of the station cavities have been calculated. The properties of the distributions of the hydraulic heads and the external water pressure loads around the four intake tunnels have been analyzed in detail. Some respective advantages and disadvantages existing in the suggested seepage control scheme are evaluated and indicated.