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研究生:廖英達
研究生(外文):Liao Ying Da
論文名稱:飽和砂土驅動抗剪強度與土壓力係數關係
指導教授:楊朝平楊朝平引用關係
學位類別:碩士
校院名稱:中華大學
系所名稱:土木與工程資訊學系碩士班
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:2007
畢業學年度:95
語文別:中文
論文頁數:76
中文關鍵詞:擋土牆土壓重新分佈側向伸張試驗抗剪強度
外文關鍵詞:Retaining wallearth pressure distributionLateral extension testshear strength
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實際上,所有的擋土牆會因荷重條件而發生移動使土壓重新分佈;其預測方法有待探討,而牆後背填土的抗剪行為則可能扮演重要的角色。為達預測牆在不同移動量時之土壓重新分佈,本研究分析25組渥太華砂的三軸側向伸張試驗結果(5種相對密度之試體x5種試驗初始圍壓)。
研究發現有效驅動摩擦角φ’m隨側向應變εr之發生而增大;有效側向應力σ’r則隨εr之發生而極遽減小,σ’r與εr間具高迴歸相關性之雙曲線關係。且可以使用軸差應力最大值(q’)max判釋試體於主動狀態所發生之側向應變εrp,其值域為伸張方向之-1.18% ~-2.99%;εrp為試體的極限側向應變量,吾人可藉以推算擋土牆的容許移動量。續使用(σ’r~εr)關係式預測擋土牆外移過程之土壓重新分佈圖,並利用AutoCAD軟體計算土壓合力F及其作用位置h/H (h:F作用點距牆底之高度、H:牆高),發現φ’m與F、h/H具反比例關係。
Practically, all retaining walls may rotate under working conditions. This phase will raises the redistribution of earth pressure acting on the retaining wall. The method for estimating the mobilized shear strength of backfill behind the retaining wall and the earth pressure redistribution at any wall movement plays an essential role in the “earth pressure filed” of soil mechanics. Therefore, this paper studies 25 sets of tests (five relative densities of specimens × five initial stress states) for analyzing the lateral extension behaviors of saturated Ottawa sand, in order to predict the redistribution of earth pressure for different wall movement.
It is found that the effective mobilized friction angle φ’m is increase with the increasing of radial strain εr . The effective radial stress σ’r is decrease quickly with the development of radial strain. The relationship between σ’r and εr can be simulated by using the formula of hyperbola. The radial strain of specimen occurring at active state εrp can be determined with (q’)max method. The values of εrp range from -1.18% to -2.99% for 25 sets of tests. We can use the magnitudes of εrp to calculate the allowable displacement of retaining wall practically.
Then, the hyperbola model of σ’r - εr relationship were suggested to predict the redistribution of earth pressure acting on a retaining wall. Thus, we can employed the model to solve the thrust F and the point of the thrust on retaining wall h/H ( h: the distance of F from retaining wall base, H : the high of retaining wall) by AutoCAD soft ware. It is found that φ’m behavior inversely with the changes of F and h/H .
摘 要........ I
誌 謝......................................................................................................III
目 錄......................................................................................................IV
圖目錄. ....................................................................................................VI
表目錄... ...................................................................................................XI
符號表............ .........................................................................................XII
第一章 緒論 1
1.1 研究動機與目的 1
1.2 研究方法 2
1.3 論文內容 2
第二章 文獻回顧 4
2.1 前人相關研究 4
2.1.1 現地試驗 4
2.1.2 模型試驗 5
2.1.3 數值解析 6
2.1.4 元素試驗 7
2.2 本研究所使用之實驗數據 8
2.2.1 試驗系統開發 8
2.2.2 壓密及側向伸張試驗 9
2.2.3 側向伸張試驗結果之應用 11
第三章 研究方法 19
3.1 側向伸張試驗試體之主動狀態判釋 19
3.2 側向伸張試驗試體之驅動摩擦角發展 20
3.3 土壓重新分佈之估算法 20
3.4 土壓合力與作用點之計算法 23
第四章 側向伸張行為 32
4.1 體積應變與驅動摩擦角之關係 32
4.2 側向應變與驅動摩擦角之關係 32
4.2.1 、 關係曲線 32
4.2.2 ( 、 )關係模式 33
4.3 ( 、 )關係模式 35
4.4 擋土牆之極限移動量 36
第五章 土壓重新分布估算 55
5.1 基本假設 55
5.2 土壓重新分佈預測 56
5.3 牆外移模式的土壓係數與正規化土壓合力位置之關係 56
5.4 擋土牆之移動量與驅動摩擦角之關係 57
5.5 驅動摩擦角與正規化土壓合力、正規化土壓合力位置 之關係 58
第六章 結論與建議 72
6.1 結論 72
6.2 建議 72
參考文獻 73
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