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| 研究生： |
王木坤 Wang, Mu-Kun |
|---|---|
| 論文名稱： |
礫石樁抗液化之三維數值分析 Evaluation of Granular Pile for Liquefaction Resistance by Three Dimensional Numerical Analysis |
| 指導教授： |
常正之
Charng, Jeng-Jy |
| 學位類別： |
碩士 Master |
| 系所名稱： |
工學院 - 土木工程學系 Department of Civil Engineering |
| 論文出版年： | 2003 |
| 畢業學年度： | 91 |
| 語文別： | 英文 |
| 論文頁數： | 150 |
| 中文關鍵詞： | 礫石樁 、液化 、動力 |
| 外文關鍵詞： | granular pile, dynamic, liquefaction |
| 相關次數： | 點閱：41 下載：2 |
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摘要
本文針對礫石樁改良後之砂質土層進行三維動力數值模擬，並於地震作用力下探討礫石樁對此改良土層的超額孔隙水壓消散與地表沉陷減少之改善效果。首先，對不同試驗條件之動力三軸試體進行不排水動力數值模擬以驗證動力模式的適用性。由模擬結果得知三軸試體之超額孔隙水壓數值反應與實驗室量測者非常近似，但數值解有輕微高估的趨勢。接著，於礫石樁改良砂土層中進行三維動力分析，分析中採用孔隙水壓動力模式(Finn Model)與流體流動模式(Fluid Model)模擬地震中孔隙水壓之產生與消散機制。藉由此動力分析模式，吾人可對高液化潛能之砂土層進行礫石樁改良前與改良後之全尺寸動力數值模擬，以檢核礫石樁在高液化潛能之砂土層承受地震載重時之改善效果。
在礫石樁的改良效果確認後，即進行礫石樁各種打設參數之研究，如樁數、樁材料之滲透性、樁徑及樁長，並分別評估各種打設參數對礫石樁改良效果的影響。本文採用超額孔隙水壓消散比(DR)及地表沉陷改善比(IR)來評估礫石樁各種打設參數對地震時砂土層超額孔隙水壓消散及地表沉陷減緩之影響。研究結果顯示，在變化礫石樁各種打設參數之過程中，超額孔隙水壓消散比的變化值可由9.16%上升到88.5%；而地表沉陷改良比僅由2.16%變化到18.61%。由此可以得知，在地震初期礫石樁在減少地表沉陷方面(加勁效果)不若超額孔隙水壓消散方面來的有效。因此，礫石樁在地震初期之主要功能為快速消散超額孔隙水壓以降低其液化潛能。
Abstract
An elastic-plastic, dynamic three-dimensional (3-D) Finite Difference Method (FDM) is adopted to investigate the effects of granular pile improvement on dissipation of excess pore water pressure and mitigation of ground settlement during earthquake. To verify the appropriateness of dynamic model, undrained dynamic triaxial tests were simulated under different experiment conditions. The numerical predictions and laboratory measurement shows a similar tendency. Subsequently, a 3-D finite difference dynamic analysis was implemented on a sandy layer with and without granular pile treatment. The analysis was conducted incorporated with dynamic pore-water pressure calculation and fluid flow modeling. Numerical results with and without granular pile improvement were then compared to illustrate the improvement effect of granular pile on high liquefaction potential sandy stratum.
Eventually, a series of parametric studies were performed on installation parameters of granular pile includes pile configurations, pile permeability, pile diameter and pile length. The effect of various installation parameters were discussed in terms of dissipation of excess pore water pressure and reducing of ground settlement during earthquake. In this study, it was found that the improvement effect of granular pile on reducing the ground settlement may not be as beneficial as in the case of excess pore water pressure dissipation. The dissipation ratio of excess pore water pressure DR value varies from 9.16% to 88.5% for various improvement cases violently while the improvement ratio of ground settlement IR value alters mildly from 2.19% to 18.61%. This implies that the granular pile is predominantly capable of dissipating the induced excess pore water pressure to mitigate the liquefaction potential rather than reduce the ground settlement during the earthquake.
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