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Title: | 探討具空間變異性土體的有效楊氏模數—以大地結構物為例 Effective Young’s modulus of a spatially variable soil mass under geotechnical structures |
Authors: | Jin-Jia Liou 劉覲嘉 |
Advisor: | 卿建業 |
Keyword: | 楊氏模數,關聯性長度,隨機場,pseudo incremental energy model,空間變異性, Young’s modulus,scale of fluctuation,random field,spatial variability,pseudo incremental energy model, |
Publication Year : | 2018 |
Degree: | 碩士 |
Abstract: | 在我們現實生活中,土壤呈現出非均質的狀態,亦即土壤各處的性質皆不相同。針對非均質的土壤特性,若想方便進行大地結構物分析,可以將土壤視為均質材料,但如何去找出一個可信賴且具代表性的材料性質代表整體土壤,為此研究重要課題。而Ching and Hu (2018) 運用Abaqus探討淺基礎案例,以楊氏模數為主軸,藉由穩態對數隨機場(垂直關聯性長度等於水平關聯性長度)模擬土壤空間變異性,並提出pseudo incremental energy model的概念,認為結構物的行為會造成土壤各處有不同的影響,因此應賦予土壤各處不同的權重,進而利用前述權重計算出加權幾何平均楊氏模數(Ewg)。於是本研究基於前人的研究基礎、分析方法,將此概念延續於不同的大地結構物,其涵蓋樁基礎、淺基礎、擋土牆等,藉由pseudo incremental energy model估算出加權幾何平均楊氏模數(Ewg),並且將Ewg輸入均質模型中,輸出結構物的反應值。
結果發現加權幾何平均(Ewg)相較傳統幾何平均(Eg)估算出的楊氏模數,更具有代表性,無論從統計上的相關係數、變異係數,抑或是視覺上的1:1線圖中。除此之外,均質模型輸入Ewg模擬與隨機場模擬所獲得結構物反應值,亦具有相當高的關聯性。 In geotechnical engineering, we always choice suitable values of soil properties to anlyze geotechanical structures. However, soil properties are not inherent. Therefore, it is important to find appropriate soil properties for our analysis. This paper focuses on effective Young's modulus. In order to estimate effective Young's modulus, Ching and Hu (2018) propose pseudo incremental energy model. Based on the previous research, this study explores more geotechnical structures, including pile foundation, footing, etc. We estimate effective Young's modulus and responses for above geotechnical structures by pseudo incremental energy model. It was found that pseudo incremental energy model is a good method for our study cases except one case of active retaining wall. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/70858 |
DOI: | 10.6342/NTU201802295 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 土木工程學系 |
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File | Size | Format | |
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ntu-107-1.pdf Restricted Access | 8.33 MB | Adobe PDF |
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