以離心模型試驗與數值模型探討高角度逆向坡的破壞行為

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Title:	以離心模型試驗與數值模型探討高角度逆向坡的破壞行為
Authors:	胡家豪;Hu, Chia-Hao
Contributors:	土木工程學系
Keywords:	逆向坡;PFC3D;離心模型;尺寸效應;Anti-dip slope;PFC3D;centrifuge model test;scale effect
Date:	2019-01-28
Issue Date:	2019-04-02 14:08:48 (UTC+8)
Publisher:	國立中央大學
Abstract:	臺灣因位於板塊的交界上而有多元的地質環境，但也使得臺灣地區平均每年約發生26,686次地震(中央氣象局)，而這也使得邊坡處於不穩定的狀態，再加上有著季風與颱風帶來充沛的雨量，往往造成岩坡發生滑動或破壞。因需要探討不同尺度下岩坡之穩定及破壞機制，因此在室內之物理試驗方面，採用中央大學土木系之離心機進行試驗，並使用直徑5mm的研磨石球作為簡化物理模型的材料，探討在改變不同層數厚度及解壓長度之岩體的變形行為，模擬簡化岩坡在不同條件下之反應，並且對於模擬後的結果進行細部分析，得到每片岩石片之倒塌情形及整體破壞變形比例。取得試驗結果後，利用PFC3D模擬在相同重力場及相同層數與解壓長度下，以數值模擬出與物理模擬相似的結果，再將此數值模擬的參數結果提取出來，利用其數值參數模擬在相同逆向坡配置100倍重力場下之變形與破壞結果，並討論在此數值模擬結果下的破壞情形。 ;Taiwan has a diverse geological environment caused by plate movement. On average, there are about 26,686 earthquakes per year in Taiwan, and this fact leaves the rock slopes in an unstable state, not to say the influence caused by the heavy rainfall. Because of the need to explore the stability and failure mechanism of rock slopes with different scales, the laboratory tests with centrifuge in NCU were conducted to simulate simplified models to record the rock slope behavior under different layer thickness with 5mm diameter grinding stone ball. Detailed analysis was performed on the simulated results to obtain the deformation of each piece of rock sheet and the overall failure deformation ratio. Afterwards, we have used PFC3D to simulate the same model in centrifuge test with the same gravitational field. First of all, numerical simulations were verified by comparing to physical simulations. Secondly, we used the verified numerical parameters to run the numerical models with 100g, simulating anti-dip slopes with 7.5 to 12 meter height and discussed the deformation and failure results under this numerical simulation result.
Appears in Collections:	[Graduate Institute of Civil Engineering] Electronic Thesis & Dissertation

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