| Summary: | 碩士 === 中興大學 === 水土保持學系所 === 95 === The mixtures of sand, gravel, silt and water move down by gravity along the slope and become extensive accumulation in the downstream. In order to understand how the colluvial mass transfer into debris flow. The movement behaviors of landslide were observed by laboratory test. We used different condition as five kinds of water content, three kinds of grain size and two kinds of channel bed materials. The results were shown as follows:
1. For the same water content, as the slope increases, the resistance increase. For the different water content, as the influence of apparent cohesiveness on soil, unsaturated soil is avalanched by 33%, the dry soil is avalanched by 21% and the saturated soil is avalanched by 34%.
2. Because the collision and friction of the particle are violent, the resistance of unsaturated soil is bigger than saturated soil.
3. When the slope increases, collapse length and L/H is increase. When the slope increases, the A/L2 and deposition angle is decrease.
4. The large shear strength makes the collapse length and L/H increased, the A/L2 and deposition angle decreased.
5. When water content increases, the landslide length, area and L/H value is decrease. When water content increases, the A/L2 and deposition angle is increase.
6. The rougher of bed makes the collapse length and L/H decreased, the A/L2 and deposition angle increased.
7. When the slope increases, the heap type turns into oval-shaped. Show the influence of resistance.
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