| Summary: | 碩士 === 國立中興大學 === 土木工程學系所 === 105 === It is the most common using the Newmark displacement method to calculate the permanent displacement of each grid point (grid cell) in the Digital Elevation Model (DEM) in regional seismic slope stability analysis. However, many of the assumptions are made to these analyzes. These assumptions are somewhat different from the actual situation. For example, the Newmark method assumes that the sliding block is rigid and failure mode is shallow, but the actual sliding block, regardless of soil or rock, is flexible and failure mode can be deep arc-shaped. In addition, using grid points for analysis is not appropriate because the grid cell is not associated with terrain features. Therefore, this study takes the slope unit as the basis, combined with the flexible block displacement prediction model and the topographic amplification effect, to develop a method for seismic hazard assessment of slope in a large area.
This study is divided into two parts. In the first part, the geographic information system (GIS) is used as the analysis platform to assess the regional seismic landslide hazard. Based on DEM, several finite slope units are generated. A simple method is used to assess the critical acceleration (ky) of the slope unit subjected to Arc-shaped failure. Afterword, the displacement of the slope unit is estimated by both of rigid and flexible displacement model. The second part is to quantify the results of all the displacement prediction models, and compare and discuss the differences. Moreover, the grid unit is also used to analyze and the difference between the slope unit and the grid unit is compared. Finally, we add topographic amplification effect and discuss the effect of topographic amplification effects on prediction accuracy.
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