Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/89375
標題: A Study on the Mechanical Properties and Slope Stability of Gravel Deposits Using the Discrete Element Method
以分離元素法探討卵礫石層力學性質及邊坡之崩塌
作者: 吳振偉
Chen-Wei Wu
關鍵字: 卵礫石層
PFC2D
邊坡
gravel deposits
PFC2D
slope
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摘要: 台灣之卵礫石層分布廣泛,許多卵礫石層覆蓋的地區已有工程建設,卵礫石層邊坡之崩塌及土石流都是非常值得探討的問題。過去卵礫石層的力學性質多利用實驗室及大型現地直剪試驗得到,由於大型現地直剪試驗需耗費大量時間、人力及金錢,數值模擬取代傳統的試驗方式越來越盛行。本研究利用以分離元素法為基礎之數值軟體PFC2D來進行雙軸試驗,透過複迴歸分析以建立宏觀參數與微觀參數的關係式,其中宏觀參數參考前人現地調查整理之強度值(A)、柏松比(ν)、彈性模數(E);微觀參數為正向勁度(kn)、切向勁度與正向勁度比(ks/kn)、摩擦係數(f)、鍵結強度(bond)。且進行驗證,誤差值分別是強度值為16.29%、柏松比為0.6%、彈性模數為3.06%。接著進行PB設計來探討微觀參數對現地宏觀參數的各別重要性,另外也對摩擦係數及鍵結強度做複迴歸分析,得到兩者之關係式可應用於後續的邊坡模擬。 2008年9月15日辛樂克颱風來襲導致南投縣豐丘之邊坡崩塌,造成近50000立方公尺的崩塌災害,導致7人死亡7人受傷。豐丘邊坡由河階地卵礫石組成,根據前人對此地區之研究,利用Plaxis 2D反推得到參數,接著利用PFC2D雙軸試驗對Plaxis 2D之結果做擬合,將擬合結果之參數與第一部分所建立的關係式來進行PFC2D邊坡模擬。最後以弱化表層之摩擦係數及鍵結強度來代表降雨入滲卵礫石層間的水含量上升而使卵礫石間之膠結軟化導致邊坡崩塌的結果。
Gravel deposits are widely distributed in Taiwan. Some areas coverd by gravel deposits already have much construction. Debris flow and slope stability of gravel deposits are important issues to be discussed. We usually used laboratory tests and in situ large scale direct shear tests to obtain the mechanical properties of gravel deposits. Duo to the cost of lots of time, money and manpower on the in situ large scale direct shear test, nowadays we often use numerical analysis instead of conventional tests. Particle Flow Code in two Dimensions is a numerical analysis software. In this study, PFC2D is adopted to simulate biaxial tests. And use Multiple Regression Model to establish the relationship between macro and micro parameters. Macro parameters include strength (A), Poisson ratio (ν), and elastic modulus (E) according to previous researchs. Micro parameters include normal stiffness (kn), ratio of shear to normal stiffness (ks/kn), friction coefficient (f), and bond between particles (bond). The results of validation show that the error are 16.29%, 0.6% and 3.06% for strength (A), Poisson ratio (ν) and elastic modulus (E). Then use the PB design to discuss the relative importance between macro and micro parameters. In order to study the slope stability of gravel deposits,we also use Multiple Regression Model to establish the relationship between the friction coefficient and the bond between particles. In September 15, 2008, a road slope in the Fengqiu area of Nantou country collapsed during the attack of typhoon Sinlaku. The collapse debris of approximately 50 thousand cubic meters resulted in 7 people died and 7 people injured. The slope is composed of gravel deposits of a river terrace. According to previous researchs in this area, we use Plaxis 2D to obtain parameters. Next, biaxial tests in PFC2D are used to fit the result of Plaxis 2D. The fitting results and the relationship equations in part 1 are applied to establish slope model in PFC2D. Finally, the weakening of the friction coefficient and the bond between particles are used to simulate the increase of water content which results in the decrease of cementation between gravels causing slope failure.
URI: http://hdl.handle.net/11455/89375
其他識別: U0005-1708201516492600
文章公開時間: 2018-08-19
Appears in Collections:水土保持學系

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