研究生: |
郭峻諺 Chun-Yen Kuo |
---|---|
論文名稱: |
以二維方法建立有限土體深開挖之一維簡化分析法 A study of 1D Simplified Analysis Method for Deep Excavation under Limited Soil Space Conditions by 2D Numerical Method |
指導教授: |
林宏達
Horn-Da Lin |
口試委員: |
王建智
Chien-Chih Wang 呂芳熾 Fang-Chih Lu 林永光 Yong-Guang Lin 鄧福宸 Fu-Chen Teng |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 營建工程系 Department of Civil and Construction Engineering |
論文出版年: | 2019 |
畢業學年度: | 107 |
語文別: | 中文 |
論文頁數: | 181 |
中文關鍵詞: | 深開挖 、有限土體 、一維簡化分析法 、鄰近建物 、二維有限元素法 |
外文關鍵詞: | adjacent building, finite soil body, 1D simplified method, limited soil space, deep excavation |
相關次數: | 點閱:141 下載:3 |
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本研究探討深開
挖之有限土體議題,而有限土體效應將會引致側
向土壓力減小及壁體變位 較小之現象。目前業界上經常使用一維軟體
分析開挖行為,且 在一維分析中,尚無適合用來模擬有限土體之方法。
本研究將以二維分析為基礎,建立一套有限土體一維簡化分析法。
本研究
彙整過去有限土體之二維分析結 果, 並得到以下成果: :(1)界定 出有限土體分析 適 用範圍 鄰房距牆比 L/He≤ 1,鄰房深度比
Ha/He≥ 05 。 (2)由於 有限土體 效應將會引致作用於擋土壁上之側向 壓
力減小現象,本研究 以側向壓 力 作 為 有限土體效應之探討方向 。 (3)定
義 一 新參數側向壓力比 來量化側向土壓力減小現象 。 並 藉由 此 側向壓
力比做為連結二維與一維之關係。 (4)在 一維分析 中,藉由 修正 黏土層
之強度 Su值 來模擬有限土體效應 。 提高 Su值能降低主動土壓力 ,而 黏
土層之 Kh值 也 與 Su值有關 ,利用以上兩種 特性 來模擬有限土體 引致之
側向壓力減小現象 。
最後,
本研究以一假設之黏土層開挖案例建立有限土體設計圖表。
首先 進行 此假設案例之 有限土體二維分析。接著 利用此以 有 限土體 二
維 分析 結 果,並透過 側向壓力 比 之 概念 來 建立 一新有限土體一維簡化
分析法設計圖表。最後再 藉由一假設 範例, 對此 一維簡化 法之 使用流
程 進行 介紹,並探討此方法之可行性 。
This study explores the limited soil space issues of deep excavation5 Finite soil effect will cause the decrease of lateral earth pressure and wall deflection5 One-dimensional software nowadays is often used to analyze excavation behavior in practice5 However, there is still no suitable method to analyze excavation under limited soil space conditions5 Based on two-dimensional analysis, this study develops a one-dimensional simplified analysis method for deep excavation under limited soil space conditions5
This study summarizes the past results of two-dimensional analysis of deep excavation under limited soil space conditions5 The results are: (1) Define the scope suitable for finite soil analysis: building distance to excavation depth ratio L/He ≤ 1 and building depth to excavation depth ratio Ha/He ≥ 05 5 (2)Since the finite soil effect will cause the reduction focus of lateral earth pressure on retaining wall, the lateral pressure is the discussion of finite soil effect in this study5 (3) Define a new parameter
IV
lateral pressure ratio (LPR) to quantify the reduction of lateral earth pressure5 (4) The finite soil effect is simulated by modifying Suvalue of clay in one-dimensional analysis5 Increasing Suvalue can reduce the active earth pressure and Kh value is also related to the Suvalue5 The above two characteristics are used to simulate the lateral pressure reduction caused by the finite soil effect5
This study establishes a finite soil body design chart by a hypothetical clay layer excavation case5 First, a two-dimensional analysis of the finite soil of the hypothetical case is performed5 Then use this two-dimensional analysis results, and the lateral pressure ratio to establish a new finite soil one-dimensional simplified analysis design chart5 Finally, a hypothetical example is included to demonstrate the proposed simplified method and to explore the feasibility of this method5
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