绥化市红兴水库渗漏分析及渗控方案模拟预测

Seepage Analysis and Forecast of the Seepage-Control Schemes of Hongxing Reservior in Suihua City

为解决水库建成后渗漏较为严重的问题,依据黑龙江省绥化市红兴水库初期蓄水失败后补充的地质勘探资料,分析水库渗漏的主要原因是库区内的粘土层分布不连续。采用三维数值模拟计算,建立红兴水库区地下水流概念模型及其数学模型,运用FEFLOW软件的剖分功能对研究区进行了刻画;在此基础上,对无防渗方案和拟修4种防渗墙方案的防渗效果进行了模拟预测和对比。结果表明:有坝段防渗对渗漏总量的控制具有十分明显的作用,可以使水库渗漏总量减少约70%;渗漏量及渗透比降基本随防渗长度的增大呈线性趋势减小;南岸东侧防渗1 000 m、西侧防渗1 700 m时,为防渗效果最好的方案。

After the construction of Hongxing reservoir in Suihua City, Heilongjiang Province, a water storage test showed that the reservoir has a severe seepage problem. According to the field survey works, the main reason of the severe seepage is discontinuous distribution of clay at surface of the reservoir. Based on the analysis of hydrogeological conditions and characteristics of groundwater flow, FEFLOW was adopted to construct the groundwater numerical model for the study area. The seepage fields under the conditions of five different seepage control schemes （no impervious wall and four types of impervious wall）were simulated by using three-dimensional groundwater simulation model. The results showed that the seepage-control of the section with dam is very effective, it can decrease 70% of the total reservoir seepage quantity which without any seepage-control conditions. The seepage quantity and seepage gradient linearly decreased with increase of seepage-control length. The best effective scheme for seepage-control is the whole dam section with impervious wall and 1 000 m and 1 700 m impervious wall in east and west part respectively of the reservoir south bank.