| 姓名 | 謝翠萍(Tusi-Ping Hsieh) | 電子郵件信箱 | E-mail 資料不公開 | |
| 畢業系所 | 營建工程系碩士班(Department and Graduate Institute of Constrction Engineering) | |||
| 畢業學位 | 碩士(Master) | 畢業時期 | 93學年第2學期 | |
| 論文名稱(中) | 材料空間變異性對軟岩邊坡穩定之影響 | |||
| 論文名稱(英) | Impact of Material
Spatial Variability on Slope Stability in Weak Rock | |||
| 檔案 |
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論文使用權限 | 校內外完全公開 | |
| 論文語文/頁數 | 中文/114 | |||
| 摘要(中) | 傳統邊坡數值穩定性分析時，大多沒有考慮到材料空間變異性之影響性，材料無論在理論上或是在實際邊坡上很少邊坡為均質材料，因此傳統的邊坡分析是種較為不合理的現象，而地質鑽探時都是以垂直鑽探為主，除試驗需要外，極少以水平或傾銷鑽探作為設計之基礎，這也與現地所需有關係，導致空間變異性資料難以取得必需以現地資料加上文獻中提及的尺度變動作為分析依據。本文主要在分析空間變異性對軟岩邊坡的影響評估，以了解破壞的因子、統計邊坡破壞的形式還有尺度變動對邊坡穩定之影響。文中以美國德州先前原打算興建之的Superconducting
Super Collider (SSC)計畫中所鑽探取得的Eagle Ford 頁岩資料，以及試驗結果，利用數值分析中之分離元素法與UDEC
(Universal Distinct Element
Code)，做為材料特性和邊坡穩定分析的程式，並且模擬邊坡開挖所會遇到之破壞型式，提供未來在軟岩邊坡開挖時，可以對破壞的型式加以預防，本文中亦有討論到邊坡破壞的影響範圍，可讓邊坡穩定支撐材更經濟的運用在邊坡支撐上。 材料空間變異性則使用隨機場模式來推導及建立，同時利用蒙地卡羅模擬方法和UDEC乃是來分析材料空間變異性和邊坡穩定性，從一連串節理間距與節理傾角的破壞機率及破壞型式分析，並探討元素大小對邊坡穩定的影響性評估和變動尺度對邊坡穩定的影響，結果如下：(1) 靠近先前分析的不穩定區域時，破壞機率皆高達85％以上，距離不穩定區域較遠時，破壞機率則會大幅下降。(2) 當減少水平方向變異性即增加水平方向之隨機元素大小時，對有節理存在時之邊坡破壞率的影響有限，但有增加之趨勢；而無節理邊坡中，破壞率則是會大幅提升。(3) 當水平方向之隨機元素增大時，因節理會切割過隨機場元素，造成破壞之剪力面不連續，並造成軟弱材料區破壞不連續。 關鍵字：空間變異性、隨機場、軟岩、蒙地卡羅模擬、UDEC程式 | |||
| 摘要(英) | The impacts of
material spatial variability were usually not considered in traditional
slope stability analyses. However, most geotechnical materials are
usually not uniform inside a slope. Thus, traditional ways of analyses
were not very reasonable. On the other hand, most geological
explorations used vertical borings. Horizontal and inclined borings were
seldom performed unless required by the client. The information about
the spatial variability is hard to obtain and usually used the previous
studies to analyze. The objective of the study is to evaluate the impact
of spatial variability on slopes in soft rocks. To understand the
failure mechanisms, types of failures, and the size of the scale of
fluctuation, d, on the slope stability. The material properties of Eagle
Ford Shale from the canceled Superconducting Super Collider (SSC)
project in Texas, USA were used as the basis for the numerical analyses
using distinct element method based program, UDEC. The results of the
analyses could be used for prevention of slope failure, future support
system, and geotechnical exploration. The random field model is used to obtain the material spatial variability. Monte Carlo simulation, UDEC, and random field model are used to analyze the impact of material variability and the slope stability. A series of numerical experiments are performed to understand the effect of joint spacing, joint angle, and size of scale fluctuation. Failure types and mechanisms are also synthesized and evaluated. The following results can be obtained: (1) The probabilities of failure are all very high as the slope close to the unstable zone boundary. (2) As the horizontal size of d increased, the probabilities of failure for the slopes with joints remains about the same. However, for the slopes without joints, the probability of failure increases as the d increases. (3) The joints may become a non-uniform boundary for the weak materials to fail or shear as a slope becomes unstable. Thus, the slopes with joints yield less failures as d increases. Key word：Spatial Variability; Random Field Model; Weak Rock; Monte Carol Simulation; UDEC | |||
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