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研究生:林英傑
研究生(外文):Ying-Chieh-Lin
論文名稱:加勁擋土構造非線性應力分佈分析與研究
論文名稱(外文):The Research and Analysis of Nonlinear Stress Distribution in Reinforced Soil Structures
指導教授:謝宗榮謝宗榮引用關係
指導教授(外文):Tzung-Jung Hsieh
學位類別:碩士
校院名稱:中華技術學院
系所名稱:土木防災工程研究所
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:138
中文關鍵詞:加勁擋土牆地工格網橫桿效應最佳間距拉出試驗
外文關鍵詞:reinforced wallpull outgeogridoptimumspacingtransverse
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地工格網分為硬式及軟式兩種,國內常用軟式格網做為加勁材料,其生成方法為編織方式;材質多為PET纖維。格網提供拉出阻抗的來源有二,其一為加勁材表面所提供的摩擦力,另一個則為橫桿所提供的被動承載阻抗。
橫桿在格網中,能穩定加勁材應力之傳遞,幫助表面摩擦力的發揮;減少位移,加強錨錠效果;而無橫桿之格網,縱桿承受較大的應力,拉出阻抗的尖峰值也會降低且提早發生破壞。
本研究為室內實驗研究地工格網拉出時的界面力學行為,並探討不同間距下橫桿所造成的影響。試驗採用大型多功能地工織物力學試驗儀,內徑為長180cm*寬70cm*高85cm,試樣採用五種間距及考慮三種圍壓情況下的行為。研究結果顯示,正向應力的提高,對於拉出阻抗力之尖峰值會有滯後發生的趨勢,於相同埋置長度下,低正向應力時加勁材尖峰拉力值所對應拉出位移值較小,當拉出阻抗力通過尖峰值以後埋置長度內各點之位移速率將趨向定值。而橫桿的最佳間距約在 1.5 D ~ 2.0 D ( D = 50.8 mm ) 之間,且研究中發現,橫桿不足將使拉出阻抗力產生下滑現象;但適度放寬間距,對拉出阻抗並無影響,顯示國內目前所常用的間距 1D (近似正方形編織的方式)過為緊密,無法有效發揮橫桿所應有的阻抗力。

關鍵字:加勁擋土牆,地工格網,橫桿效應,最佳間距,拉出試驗
Geogrid includes Hard and Soft 2 types, in domestic field usually the soft geogrid is used as reinforcement material, it mostly was made by woven PET fiber. There are 2 sources supplying the pull-out resistance force from geogrid, one is the friction power supplied from the surface of the reinforcement material, the other is the passive bearing resistance capacity supplied from the spacing.
The spacing is able to stabilize the power of the transmission which is produced by reinforcement material, as well as to strengthen the friction effect; minimizing the displacement and increasing the embedding effect; geogrid without a spacing it’s vertical pole should bear stronger pressure, the pull-out peak will be lower, the damage will be advanced accordingly.
The actual experiment was carried out interiorly to study the pull out geogrid applying with Asail Force meanwhile to find out the influence which was causing by different spacing gauge. Adopted with multi functioning geosynthetices testing device with inner diameter L x W x H (180 cm x 70 x 85), sampling 5 different spacing gauge and 3 different circum-pressure. The result is : the normal stress was increased and the resistance peak was detained, under the same embedding length at the normal stress, the pull out displacement figure is lesser, after passing the pull out resistance peak, the speed of the displacing on each spot of the embedding length all are fixed. The best gauge of spacing is in between 1.5 D – 2.0 D ( D = 50.80 mm ), in addition, pull out resistance effect will be lower due to lack of spacing : proper releasing of the spacing gauge can not do any harm to the pull out resistance , it shows the actual common gauge at 1D (similar to a square weaving format) is too rigid to produce the power from the spacing.

Keyword:reinforced wall, geogrid , transverse,optimum spacing,pull out.
目次

摘要 i
ABSTRACT ii
目次 iv
表目錄 vii
圖目錄 viii
第一章 緒論 1
第一節 前言 1
第二節 研究動機 1
第三節 研究方法 2
第四節 論文架構 2
第二章 文獻回顧 3
第一節 加勁土壤概述 3
第二節 拉出試驗的理論研究 4
第三節 拉出試驗的影響因素 5
壹、實驗儀器對拉出阻抗的影響 5
貳、土壤性質對拉出阻抗的影響 6
參、加勁材料對拉出阻抗的影響 7
第四節 加勁材拉出阻抗力計算 9
第三章 試驗方法及試驗計劃 12
第一節 試驗前準備 12
壹、關於實驗的相關建議 12
貳、試驗規劃 13
第二節 試驗設備 13
壹、試驗儀器 13
貳、量測系統 14
第三節 試驗材料 14
壹、試驗用砂 14
貳、試驗用地工格網 15
第四節 試驗條件 15
第五節 試驗步驟與方法 16
壹、量測儀器的校正 16
貳、單軸抗張試驗 16
參、拉出試驗 17
第四章 試驗結果與分析 18
第一節 單軸抗張試驗結果分析 18
第二節 拉出試驗結果分析 19
壹、正向應力的影響分析 19
貳、介面力學行為傳遞分析 20
第三節 橫桿最佳間距計算分析 22
第四節 縱桿效益分析 24
第五章 結論與建議 27
第一節 結論 27
第二節 建議 28
參考文獻 29
作者簡介 120
參考文獻

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