| Summary: | 碩士 === 國立中興大學 === 水土保持學系 === 89 === The channel structures for retaining debris flow can be categorized as permeable dam and impermeable dam. Usually, slit dam (permeable dam) is more efficient than the check dam (impermeable dam). Despite of their advantages, slit dams are often blockaded by boulder. In this study, slit dam with varied slit width, i.e., slits of different heights, was proposed to achieve the safe and economical objectives.
To ensure the stability of slit dam with varied slit width, four different conditions with two different heights were analyzed in this study: (1) filled dam with normal flow under maximum earthquake, (2) filled dam with maximum flow, (3) empty dam impacted by debris flow, and (4) nearly filled dam striken by giant boulder at the top of dam. For illustrative purpose, an 8 meters high slit dam with varied slit width under condition (4) was designed to illuminate the mechanics analysis, thickness of the dam at different elevation, and the reguired amounts of steel bar. Finally, this study indicates that slit dam with varied slit width can achieve the safety objective with lower cost than traditional slit dam does.
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