| Summary: | 碩士 === 國立成功大學 === 資源工程學系碩博士班 === 97 === Shih-Men reservoir is one of the most important water conservancy facilities in northern Taiwan. Since its service, the dam’s total and effective capacities have significantly decreased. With the collapse of the upstream Ba-Lin earth-filled dam and with the Rong-Hwa dam reaching its capacity, the sludge problem of Shih-Men dam has worsened immensely. It is proposed by using the mining methods to clear the sludge at the bottom of the dam while maintaining low levels of sedimentation. This will effectively prolong the service life of the dam. This study attempts to analyze theproblem of slope stability on nearby hillside and surrounding environment under the operation of sludge excavation in reservoirs.
An infinite slope analysis was used in this study. The analysis takes various factors of landslide hazards into account. These factors includes measures of slope angle, sludge depth, slip depth, cohesion and angle of internal friction. In addition, this study attempts to locate the areas that are suitable for two full-scale excavation activities.
This study has found that at the Shih-Men Reservoir, the midstream excavation area’s factor of safety is lower than that of the upstream excavation area. When there is no reduction in the material parameter, the slope angle in midstream and upstream excavation area could reach the values of 10 to 15 degrees. If there is 50% reduction in material parameter, then it would be only suitable to have an excavation area upstream to excavate at a slope angle of 5 degrees.
|
|---|
