堰塞坝冲蚀破坏型态之初步颗粒流数值模拟-防灾科技研究中心.PDFVIP

2011 土木與生態工程研討會 義守大學 堰塞壩沖蝕破壞型態之初步顆粒流數值模擬 高志文 1 馮正一*2 羅佳明 3 1. 中興大學水土保持系碩士生 2. 中興大學水土保持系教授 tonyfeng@nchu.edu.tw 3.中興工程顧問社大地工程研究中心研究員 摘 要 本研究主要利用二維顆粒流離散元素程式(PFC2D) ，針對堰塞壩進行堰塞壩溢流 沖蝕破壞整體過程的模擬，探討水位上升至溢頂破壞時堰塞壩承受之應力狀態、發生 溢流沖蝕破壞之型態與時間差異。本研究先採用相關文獻中的參數值，做為顆粒流模 型參數設定之依據，再依現況潰壩情況進行適當的修正。預期藉由各不同類型之歷史 案例驗證顆粒流數值模型後，再分析堰塞壩破壞型態的種類、時間等各項差異，以提 供後續堰塞湖災害研究之參考。最後期望藉由集水區型態、雨量強度、地質特性等數 據，推測堰塞壩存在之時間及潰壩時之洪水量，做為防災避難、撤離之決策參考。 關鍵詞：堰塞壩、溢流、沖蝕、離散元素法 A preliminary investigation by PFC on erosive failure of landside dam Kao Chih-Wen 1 Feng Zheng-Yi*2 Lo Chia-Ming3 1. Graduate Student, Department of Soil and Water Conservation, National Chung Hsing University 2. Professor, Department of Soil and Water Conservation, National Chung Hsing University tonyfeng@nchu.edu.tw 3.Researcher, Geotechnical Engineering Research Center, Sinotech Engineering Consultamts Abstract This study applied the distinct element method, PFC2D, to simulate the process of dam failure caused by overtopping and erosion, and to discuss stress statuses, overtopping types, and existing period while water level rising to dam failure. The parameters set for particle flow model were consulted by correlated researches, and then adjusted properly with different situations. After verifying the particle flow model by each type in the past cases, the differences of dam failure type and periods can be concluded, which provides a model for the further work in landslide dam disaster. Finally, we expect that it will be able to speculate the existing period of dams and the volume of bre