Abstract:

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.

Key words: seepage analysis；seepage-control schemes；impervious wall；numerical simulation；groundwater