| Summary: | 碩士 === 逢甲大學 === 土木工程學系 === 105 === During the Morakot Typhoon in 2009, Xiaolin Village was catastrophically wiped out. After the incident, the NHK TV Station in Japan reported on the deep-seated slip failure in the area and this was then widely and fervently discussed in the media in Taiwan.
Xiaolin Village has long exhibited distinct characteristics of displaced landforms. Displacement velocity vector distribution plots, in situ photos, and historical satellite images all indicate that the whole village is located in shear banding tilted slopes.
In this study, the author found that slip failure of shear banding tilted slopes is related to the shear textures in the total width of a shear band. Therefore, the slip failure of these shear banding rock slopes only occurs within the total width of a shear band and deep-seated slip failure is not likely to occur.
Moreover, it was also found by the author that the impact of felt earthquakes is likely to be ignored if brittle fracture in the shear bands is not taken into consideration, which means only the rise in the underground water table caused by rainfall is considered. Under this circumstance, the following cannot be explained: (1) at the time of landslides, annual rainfall volume and instant rainfall volume are both not at the maximum; (2) shear banding tilted slopes still experience slip failure even after a drop in the underground water table and in the absence of a storm, heavy rains, and earthquakes.
Finally it is recommended by the author that more effort should be dedicated to understanding the slip failure mechanism of shear banding tilted slopes and the methods of slope stability analysis. This will prevent the domestic media from blindly following false foreign reporting of circular deep-seated slip failure mechanism and providing incorrect information to the public.
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