| Summary: | 碩士 === 逢甲大學 === 土木及水利工程所 === 92 === ABSTRACT
Taiwan is located at the intersection area of the Eurasia plate and Philippine plate such that its geology conditions are very poor. Because of the densely covered active faults, strong earthquakes are very often to occur in Taiwan. Many earth dams have been found to spread over the waterways in valleys. The restriction of technology in the past has limited the safety evaluations to 2D conditions for each dam performed every five years or directly after attacking by a severe earthquake.
In this thesis, 3D dynamic analyses for earth dams with three different combinations for inclination angles of the two banks for a valley have been performed. Results from this study indicate that the above-mentioned inclination angles have significant influence on 3D dynamic behaviors of a dam. During the attacking of an earthquake, such kinds of influence can be observed as regarding to the maximum displacements, velocities, accelerations, normal stresses and shear stresses for the corresponding directions in each section of the dam body.
For high-rise earth dams, when those effects induced by a valley or the dam body are to be considered, it is strongly suggested that 3D dynamic analyses with real inclination angles for the two banks of a valley have to be adopted when performing safety evaluations for reservoirs in the future.
Keywords: 3D , valley , angle of inclination , reservoir , dam body , dynamic analysis
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