| Summary: | 碩士 === 國立交通大學 === 土木工程系所 === 93 === In this study, based on Richards equation and infinite slope stability theory, a rainfall-triggered shallow landslide model is developed and examined. After the developed model is verified, the type and mechanism of failure in steep and mild slopes are investigated first. The influences of rainfall characters including intensity, duration, and pattern on shallow landslide are then examined. The results show that the failure of steep slope could happen when the soils are unsaturated or saturated. However, the failure of mild slope seems to occur in saturated soils only. Both the decrease of soil suction and the rise of groundwater table caused by rainfall could trigger landslide. The intensity, duration, and pattern of rainfall have significantly influence not only on the occurrence of shallow landslide but also on the depth and time of soil failure. In addition, the sufficient condition of landslide caused by the rise of groundwater table is derived and it could be used in engineering practices.
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