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Impact Reduction of Cantilever Slit Dams
|作者:||黃立勳||關鍵字:||debris flow;土石流;slit dam;impacted force;used-tire cushion;梳子壩;衝擊力;廢輪胎緩衝材料||出版社:||水土保持學系||摘要:||
Slit dam, is usually adopted to intercept debris flow and thus reduce its impact on downstream areas. There are two main types of retaining structures used for the slit dam design in Taiwan, namely, gravity type and cantilever types. In this study, we collected various design data of slit dams in Taiwan to study the safety issue and the efficiently on blocking debris and building costs as well. To investigate the stability of the cantilever type slit dam, four different conditions were analyzed as follows. (1) Empty dam impacted by debris flow. (2) Full filled dam with normal flow under maximum designed earthquake. (3) Full filled dam with maximum flow. (4) Nearly full filled dam stricken or impacted by huge rock at the top of the dam.
Owing to the fact that certain structures may not survive the impact due to huge falling rocks even when they were designed by codes. It is intended to carry out impact tests on the proposed used-tire cushion materials to evaluate the effectiveness of such devices on reducing the maximum impact force. The results indicate that used-tire cushion material can significantly decrease the maximum impacted force about 95% or higher for slopes between four to fourteen degrees. It is then concluded that these use-tire cushion materials may have excellent potentials to be applied to maintain the safety of retaining structures. As a result, it seems more economically efficient to design retaining structures with used-tire cushion systems than those without used-tire cushion systems.
|Appears in Collections:||水土保持學系|
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