| 研究生: |
林雅程 Lin, Ya-Chang |
|---|---|
| 論文名稱: |
利用非連續體數值分析法探討山崩運移距離可靠度分析與地表震動模擬之可行性研究 Investigating the Reliability-based Run-out Distance and Ground Vibration Simulation of Slope Failures using Discrete Element Method |
| 指導教授: |
吳建宏
Wu, Jian-Hong |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 土木工程學系 Department of Civil Engineering |
| 論文出版年: | 2021 |
| 畢業學年度: | 109 |
| 語文別: | 中文 |
| 論文頁數: | 189 |
| 中文關鍵詞: | NMM-DDA 、可靠度分析 、地表震動訊號 、訊號處理 |
| 外文關鍵詞: | NMM-DDA, reliability analysis, ground vibration signals, signal processing |
| 相關次數: | 點閱:132 下載:0 |
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本研究以非連續體分析法(DDA)模擬2020年12月4日上午8點於臺鐵東部幹線瑞芳至猴硐區間臺鐵猴硐崩塌事件與2010年4月25日發生於國道三號3.1公里的崩塌事件,探討山崩運移距離的可靠度分析;接著,再以整合數值流形法(NMM)與非連續體變形分析法模擬國道三號3.1公里崩塌事件的震動訊號,探討整合方法模擬震動訊號的可行性,再進一步分析震動訊號與塊體運動行為之間的關聯性。
首先,本研究蒐集兩個研究場址的基本資料,瞭解各邊坡案例在不同時期的地形高程、地層分布與節理傾向等資料,詳細瞭解崩塌的源由,以此做為模型建立之基礎與後續參數變異之依據;而兩個案例利用非連續體分析法模擬邊坡崩塌的結果與事實具有極高之相似度,之後進一步對參數做變異的調整,探討以點估計法計算的標準常態累積分布圖在危害等級分類得合理性,兩個案例的危險分區皆具有高度之合理。
接著,因為國道三號3.1公里崩塌事件的震動訊號被五分山地震觀測站所記錄下來,故以非連續體分析法模擬的結果為基礎,修改邊界條件、增加覆蓋網格與分析網格尺寸有效的模擬震動訊號,亦利用快速傅立葉變換(FFT)頻譜分析與短時距傅立葉變換(STFT)頻譜分析,探討鄰近地震測站訊號與模擬所得訊號的頻率成分,發現現地情況與模擬訊號情形相似,確認以NMM-DDA模擬山崩造成震動訊號的可行性。本研究亦透過頻譜分析,探討塊體運動行為與訊號之間的關聯性,相較於塊體滑動的行為,塊體碰撞的行為會產生較高頻的訊號及較大的速度震幅。
First, this study collects basic data of two research sites, understands the terrain elevation, stratum distribution, and joint tendency of each slope case in different periods, and understands the source of collapse in detail, which is used as the basis and basis for model building. The basis for the subsequent parameter variation; and the two cases used the discontinuity analysis method to simulate the slope collapse and the results are very similar to the facts. After that, the parameters are further adjusted for variation and the standard normal accumulation calculated by the point estimation method is discussed. The distribution map is reasonably classified in the hazard level.
The vibration signal of the 3.1-kilometer collapse event on National Highway No. 3 was recorded by the Wufenshan Seismic Observatory. Therefore, based on the simulation results of the discontinuity analysis method, the boundary conditions were modified, the coverage grid was increased, and the grid size was analyzed effectively. For vibration signals, FFT spectrum analysis and short-term Fourier transform (STFT) spectrum analysis are also used to explore the frequency components of the nearby seismic station signals and the simulated signals. It is found that the on-site situation is similar to the situation of the analog signal. NMM-DDA simulates the feasibility of shaking signals caused by landslides. The relationship between block motion behavior and signal is explored through spectrum analysis. Compared with block sliding behavior, block collision behavior will generate higher frequency signals and larger velocity amplitudes.
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校內:2026-10-04公開