Title

岩層弱面性質對邊坡變形與破壞行為的影響

Translated Titles

Influence of weak planes properties on deformation and failure behavior of slopes

Authors

吳昕明

Key Words

邊坡 ; 分離元素法 ; 位移量 ; Slope ; Distinct Element Method ; Displacement

PublicationName

中興大學水土保持學系所學位論文

Volume or Term/Year and Month of Publication

2017年

Academic Degree Category

碩士

Advisor

張光宗

Content Language

繁體中文

Chinese Abstract

岩石邊坡受風化及地下水位變化等影響,會使得材料逐漸弱化,導致邊坡岩層發生潛移、褶曲或漸進破壞。而岩石邊坡發生位移,未必代表其已達到了崩塌條件,運用分離元素法UDEC數值分析軟體,以強度折減、重力增加及地下水位抬升,探討岩石邊坡內部弱面位態和間距對邊坡破壞前累積位移量的影響,比較分析結果的差異,並且討論在不同弱面位態下邊坡破壞的過程與機制。 本研究利用equilibrium ratio和計算步數精確定義破壞條件,以不同方式來模擬具有不同弱面位態和間距但相同安全係數之邊坡在破壞前所累積之位移量大小,再將破壞形式與前人研究比較,其研究結果顯示,邊坡變形行為,和文獻回顧中受重力作用之板岩邊坡變形行為相符。 研究結果顯示弱面傾向與坡面傾向相反者其在破壞前累積之位移量較多,且弱面位態越接近垂直者其在破壞前累積之位移量也越多。

English Abstract

Rock slope subjected to weathering and changes in groundwater levels will make the material gradually weakened, resulting in rock slope creeping, folding or progressive damage. The displacement of a rock slope does not necessarily mean that it reaches the condition of collapse. Events of typhoon and heavy rainfall will cause displacement, the phenomena may continue for more than a few years or even decades. Using the UDEC numerical analysis software, the strength reduction method, the gravity increase method and the groundwater level elevation method are used to study the effects of weak planes and spacing on slope behavior. In this study, we use equilibrium ratio and the number of calculation steps to define the failure condition. The cumulative displacements before collapse are compared for slopes with the same safety factor but different orientations and spacing of weak planes. The simulated deformation is consistent with the deformation behavior in literature. The results show that cataclinal slopes yield more displacement than cataclinal slope do. Moreover the more vertical the weak planes are, the more cumulative displacement obtained.

Topic Category 農業暨自然資源學院 > 水土保持學系所
生物農學 > 生物環境與多樣性
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