| dc.description.abstract | In recent years due to the global warming, extreme weather resulted disasters around the world continue to occur. In August 8, 2009, the southern part of Taiwan suffered from serious floods from heavy down pouring rain of Typhoon Morakot. To explore the main reasons for the flood disaster, which results in levee and floodwall breach, this study must collect extensive information to use the program to simulate the embankment and levee behavior when heavy rain occurred, aiming to find out the reasons for potential damage, and to reduce the probability of future disaster.
In this study, we have chosen Chiu Liao 1st Levee, in Kaohsiung County as the case study example, the relevant data is provided by Directorate General of Highways, materials testing Lab under the Ministry of Economic Affairs. About geological conditions close to the study site, based on the boring logs collected for this study, the strata is divided into two layers, the first layer consists of mostly gravel material and the second layer is the bedrock; the borehole locations are near the Lao Nung River, where Da Jin Bridge is the closest bridge to Chiu Liao 1st Levee. The software GeoStudio 2007 is adopted in this study, and one of the modules- SLOPE/W is employed for slope stability analysis. Different internal friction angle of soil, the water level, the scouring depth of soil are chosen to be three variables to explore the levee failure mechanism, the analysis was also coupled with the water level difference, and seepage condition; the above analysis results show that the values of factor of safety obtained in some cases are less than 1, reaching the failure state.
In addition, this study conducted the retaining wall failure analysis, including sliding failure, overturning failure and bearing capacity failure. It was found that the bearing capacity failure is unlikely to occur under all scenarios; however, the sliding and overturning failure can occur when the water level changes with the consideration of seepage conditions.
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