降雨影響對邊坡地滑數值模擬關係之個案探討

A case study of the Numerical Relationships between Landslide Movements and Rainfall Effects

張學群(Xue-Qun Chang)

指導教授 ： 張達德

中原大學/工學院/土木工程學系/碩士(2006年)

https://doi.org/10.6840/cycu200600499

摘要

近年來台灣地區經濟、商業與旅遊業發展迅速；台灣為多山的島嶼，許多經濟的往來需透過山路來傳輸。因此國人對坡地安全的要求，已不僅止於危害國人生命安全而已。
論文中，所研究的區域位於礁溪赤皮嶺坍滑區，為當地熱門旅遊區域必經之路，由於地處荒涼故在921地震前並無刻意去觀察探討該坡地的安全問題。921地震後，該坡地產生明顯的地滑現象，影響當地觀光業的發展，相關單位便開始重視該邊坡地滑的趨勢及原因。
產生地滑的原因，可能是因為強震改變了地下水脈原有的狀況，因此本研究蒐集了當地數位式傾斜儀監測的資料與降雨的紀錄，瞭解該坡地位移量與降雨之間的關係；應用有限元素法PLAXIS程式搭配極限平衡法STEDwin程式，分析土層在不同浸水狀態下，對於該邊坡安全所造成的影響。
本研究的成果發現累積降雨量與暴雨為該研究區域地滑的重要因子，若氣象局發報中級雨或強雨時，該邊坡應採取防範措施。以程式模擬結果發現，邊坡滑動面形成與否，與土層浸水的時間有密切關係。另外，同時應用有限元素法與極限平衡法分析邊坡的滑動行為，將能互補有無，提供更客觀的分析結果。

關鍵字

有限元素法 ； 降雨形式 ； 數位式傾斜儀 ； 地滑

並列摘要

The regional economy, commerce and tourist industry of Taiwan is developed rapidly in recent years. Taiwan is the mountain island, a lot of economic exchanges need to transmit through the mountain path. So compatriot's demand safe to the hillside fields, has already not merely stopped endangering compatriot's life security.

In these paper, researching area locate Jiao-Xi, here is the local popular place. After earthquake 921, this hillside produce obviously slippery phenomenon, then influence the development of the visiting industry in the locality. These place already become the most important researching landslide.

Sliding reason of production, perhaps strong shock change the original situation of groundwater. This research collect data of slope indicator and record of rainfall to steady the relationship between landslide movement and rainfall effects. In this research, using limited element procedure by PLAXIS and limit balanced procedure by STEDwin, that analyse slope safely in soil layer on different water state.

並列關鍵字

Rainfall Effects ； Finite Element Method ； Landslide Movement ； Monitoring Devices

參考文獻

【13】林湧群，降雨入滲影響土釘邊坡穩定性之研究，中原大學土木工程系研究所碩士論文， 2004。

【15】Zienkiewicz, O.C., Humpheson, C. and Lewis, R.W., "Associated and non-associated visco-plasticity and plasticity in soil mechanics". Geotechnique 25, No.4, 671-689,1975

【15】Brown, C.B. and King, I.P., "Automatic Embankment Analysis: Equilibrium Instability Conditions", Geotechnique, 209-219,1966.

【20】Matsui, T. and San, K.C., "Finite element slope stability analysis by shear strength reduction technique", Soils and Found., 59-70,1992.

【21】Huang, S.L. and Yamasaki, K., "Slope Failure Analysis using Local Minimum Factor-of-Safety Approach"., J. Geotech. Engrg. Div.,ASCE, 1974-1987,1993.