| Summary: | 碩士 === 國立中興大學 === 水土保持學系所 === 104 === In the river basin area of Jhuoshuei River, it is usually filled with rapids and steep slope, meanwhile, it is usually of bed geology, therefore, debris disaster such as mudflow and collapse are commonly seen, in recent years, due to concentrated rainfall, the river course at the upstream area of the Jhuoshuei River usually has serious sediment deposition, in addition, many lands cultivated by Indigenous People of Taiwan living in the mountain area is usually flooded by sands or destroyed by Typhoon, therefore, for long term governance, the main work is to recover the original flood release and sand storage function of the river, in other words, people should not fight for more lands with river. Meanwhile, to take care of the living of farmers in that area and to maintain the safety of river conservancy at the same time, in-situ mixing method (low budget need, short construction period, instant excavation, instant mixing, instant use and direct backfill, and mixing material dos not have structural safety concern and strength requirement) is adopted for low water regulation and prevention of slope collapses. A parent value experiment is conducted prior to the construction. Cylindrical specimens are taken during the construction for compression strength test. The parent value from the test is used as the quality control benchmark. For the “disaster prevention and mitigation project for the upstream and downstream of Songlin Bridge on Jhuoshuei River” in 2015, the in-situ mixed concrete was estimated at NT921/m3 (with a mixing proportion of 1 to 6). The typhoons in August and September (2015) left no damage to the low water embankments constructed. The embankments served their purpose and considered a solution suitable for this particular region.
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