南丙河水库黏土心墙土石坝三维渗流分析

Analysis of Three Dimensional Seepage Flow of Nanbinghe Core Embankment Dam

鉴于二维渗流计算无法从宏观实际表达实际渗流量和渗透特性,基于南丙河水库心墙坝地勘及水文资料,利用河海大学渗流实验室研发的三维渗流控制分析有限元计算程序,对大坝进行渗流分析计算。计算结果表明:坝体心墙及两岸帷幕对水头的消杀作用明显,防渗效果较好;正常蓄水位条件下,坝体、坝基及两岸绕坝渗漏量约62万m3/a,为水库正常库容的2.6%,为坝址处多年平均年径流量的0.85%,不影响水库正常蓄水。

In view of the two-dimensional flow calculations can not reflect actual seepage flow and seepage characteristics from macroscopic view. The article analyses the seepage of the dam by using the three-dimensional seepage flow finite element analysis procedures designed by Seepage Laboratory of Hohai University, on the base the geological survey and hydrological data from the core embankment dam of Nan Binghe Reservoir. The results can be showed ： The effect of both the core wall of the dam and curtain reducing the head is obvious, with good seepage proof property. In the normal pool level conditions, seepage amount of the dam body, dam site and around-the- dam is about 6 210 000 m3. every year, accounting for 2.6 percent of normal capacity of reservoir, 0.85 percent of the average gross of surface water flow of many years. The leakage does not affect the reservoir retaining water normally.