Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/16003
標題: 不同水平間距錨版在緊密砂土中阻抗力之研究
Effect of Anchor Spacing on Resistance Force in Dence Sand
作者: 陳信佑
Chen, Shin-You
關鍵字: Anchor;錨版
出版社: 土木工程學系所
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摘要: 
本研究以室內模型試驗,探討不同B/h垂直錨版尺寸在不同埋入比H/h下,於緊砂中水平移動所受土壤阻抗力之行為;另外進行三根 方形群錨於不同間距比(S/B)下之試驗,分析群錨間距比(S/B)對群錨效應的影響。本研究同時將前人曾脩夫在鬆砂部分試驗數據一倂分析,探討不同緊密砂土對錨版土壤阻抗力之影響。
分析結果顯示錨版無因次阻抗力Nq值及破壞位移隨著錨版寬高比(B/h)增加而減少,且隨著埋入比(H/h)增加Nq值的差異也愈為明顯。而群錨在不同間距比下,其極限阻抗力隨間距比(S/B)增加而增加,但增加的幅度隨間距比增加而減少,直至間距比達到臨界間距比,錨版間破壞土楔無重疊(overlap)的現象,其阻抗力不再增加,此時錨版群組之每根錨版可獨立視為單根錨版。在鬆砂中當埋入比為2和3,間距比為3時,群錨的Nq值與單根錨版的Nq值已相當接近,亦即在此間距比下,錨版整體效率接近100%,即其臨界間距比約為2.5~3之間;同理,埋入比為4和5時,其臨界間距比約為3~3.5之間;埋入比為6時,其臨界間距比大於3.5;反觀緊砂,雖然群錨的Nq值隨著埋入比漸漸接近單根錨版的Nq值,但明顯可由實驗數據中可知在埋入比2,間距比為3.5時接近臨界間距比較鬆砂為大,其原因為緊砂中在錨版兩邊擴散角 及密度較鬆砂 為大,錨版在緊砂中所受兩邊錨版重疊效應較鬆砂的大。其臨界間距比亦將增大。至於其他埋入比的臨界間距比由於實驗相尺寸的限制須進一步試驗求取。

本文以修正二維並延伸至三維對數螺旋破壞理論和Murray and Geddes極限分析法之理論解與群錨的中間錨版與兩邊錨版無因次土壤阻抗力之試驗數據相比較,結果發現試驗值較接近錨版摩擦角δ= 的Murray and Geddes極限分析理論值。在埋入比2、3時,實驗值會略高於理論預測值,但當埋入比大於4後,實驗值趨近於理論值。
URI: http://hdl.handle.net/11455/16003
其他識別: U0005-1808200914553700
Appears in Collections:土木工程學系所

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