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Effect of Cut-off Wall near the Entrance of Spillway Tunnel  

Kim, Gyoo-Bum (K-water Institute)
Son, Young-Chul (K-Water Andong Regional Office)
Seo, Kyung-Soo (Shinwoo Eng.)
Publication Information
The Journal of Engineering Geology / v.20, no.2, 2010 , pp. 147-153 More about this Journal
Abstract
Cut-off wall with a low permeability can be constructed to prevent groundwater seepage in spillway tunnel areas. Three spillway tunnels are constructed in Im-ha multipurpose dam region and three types of cut-off walls with a variety of directions and scales are designed. As a result of MODFLOW modeling to assess the effect of cut-off wall for three types, groundwater inflows to the tunnels range from 64.26 $m^3/day$ to 65.49 $m^3/day$ and also they through a cut-off wall section from a reservoir do from 44.08 $m^3/day$ to 45.31 $m^3/day$ and it does not show any significant difference among them. Therefore, a construction process and an environmental conservation rather than the effectiveness of cut-off wall need to be considered to select the best cut-off wall in this region.
Keywords
Cut-off wall; groundwater modeling; spillway tunnel;
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