Journal of the Japan Society of Erosion Control Engineering, Vol.57,No.3,,2004

Conversion of existing closed-type dam into open-type dam and its effects on structuarl stability

Takeshi NODA, Hiroshi IKEYA, Johji SHIMA

Abstract

Recently, comprehensive management of sediment in watershed has become increasingly important. The impacted area begins where the sediment is produced and extends to the continental coastline. One of the models of this comprehensive management is conversion of the closed-type sabo dams into the open-type. This involves a modification which creates a "slit portion". Nowadays, this conversion has become popular in Japan. The structural stability of the dam body and strengthening methods of the converted dams was examined. Specifically, the decrease in structural strength due to "slit potion" was evaluated. The safety of sabo dam was evaluated using the three-dimensional construction method instead of previous two-dimensional construction method. Finally, a method of strengthening the "slit potion" was recommended.
Key words:improvement of the existing sabo dams, closed-type sabo dam, open-type sabo dam, safety of sabo dam

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