Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/33191
標題: 廬山地滑災害三維分析
Three Dimensional Analyses of Lushan Landslide Hazards
作者: 林俊良
Lin, Chun-Liang
關鍵字: 板岩邊坡
slate slope
滑動面
DEM
RAMMS
Plaxis 3D
異向性
sliding surface
DEM(Digital Elevation Model)
RAMMS
Plaxis 3D
anisotropy
出版社: 水土保持學系所
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摘要: 廬山溫泉地滑邊坡數十年來每逢豪大雨就會有道路破壞等滑動跡象發生,這不僅對邊坡上的居民造成影響,更對邊坡下方從日據時代就開始發展的溫泉區造成威脅。經水保局以及中央地質調查所長時間之監測及調查後發現,此板岩邊坡的滑動位移量於數年內累積達數公尺,可推斷為大規模岩體滑動所造成的地質災害。因廬山溫泉邊坡尚未滑落,所以並無滑動面之DEM資料以供三維分析軟體RAMMS做為模擬之模型。因此本研究先以Plaxis 3D三維有限元素分析軟體中的Mohr-Coulomb模式以及Jointed rock模式來模擬廬山地滑邊坡的滑動面範圍與深度,並將此滑動面製成DEM資料。從Mohr-Coulomb模式與Jointed rock模式之模擬成果進行比對,後者所得之模擬成果比前者還接近水保局(2006)與中央地質調查所(2010)於現地調查之滑動情形。由此可知此滑動邊坡確實有異向性的存在,而且影響非常顯著。所以在選用材料模式時,亦須考慮現地岩層的岩性。接著將由Plaxis 3D所得的滑動面DEM與原始廬山之DTM合併後,即可得到廬山地滑邊坡滑動後之DEM,匯入至RAMMS模擬而得此滑動面之滑動及堆積狀況,以供災害潛勢評估時作為參考依據。
Failure of the roads on Lushan landslide area that occurs after heavy rains for the past decades not only has influence on the local habitats, but poses a grave threat to the hot spring district beneath the slope, which has developed since the Japanese Era. After a long-term monitoring and investigating by Soil and Water Conservation Bureau and Central Geological Survey, it is discovered that this slope has slid several meters in years. Thus it could be regarded as a large-scale landslide. In this study, Mohr-Coulomb model and Jointed Rock model of Plaxis 3D are chosen to simulate the possible sliding surfaces and analyze the strata of the slope. Then the DEM of the sliding surface acquired from the best simulation of Plaxis 3D is imported to RAMMS to simulate the possible deposition. Compared with Mohr-Coulomb model, the simulation of Jointed Rock model is more similar to the field investigation. As a result, the anisotropy character does exist among this area, and it plays a very important part in the simulation. Thus, characters of the rocks such as anisotropy should be taken into consideration while choosing material models. Next, the DEM of the sliding surface acquired from Plaxis 3D is combined with the original DEM of Lushan, and then input the final DEM into RAMMS to simulate the deposition if the landslide occurred. The results suggest potential deposition as for assessment of hazard evaluation.
URI: http://hdl.handle.net/11455/33191
其他識別: U0005-2208201311084900
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2208201311084900
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