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碩士論文公告區 |
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| 年度： | 95 | |
| 姓名： | 陳國峻(Kuo-Chun Chen) | |
| 論文題目(中)： | 砂土中矩陣排列之群錨受力行為 | |
| 論文題目(英)： | Uplift Behavior of Matrix-Arranged Anchor Groups in Sand | |
| 摘要(中)： | ||
| 本研究利用數值分析的方式探討緊砂中矩陣排列之2*2和3*3擴座地錨在不同間距下之群錨效應與荷重-位移關係。數值分析乃利用砂土之連續應變硬化-軟化與體積膨脹模式，簡稱SHSOVOD模式，配合FLAC3D語言FLACish進行群錨受力行為分析，同時比對群錨在不同水平間距下的分析結果與單錨之受力行為，以瞭解砂土中垂直擴座地錨錨碇力受水平間距之影響。 由矩陣排列之群錨於不同水平間距下之研究結果顯示，不論是2*2 或3*3之群錨，當覆土深徑比為Z/D=4和Z/D=10，且水平間距達8倍地錨直徑時，地錨可免除群錨效應之影響；當覆土深徑比Z/D達16時，在水平間距大於7倍地錨直徑時，可忽略群錨效應對錨碇力之影響。 當地錨間距過於接近時(Z/D=4)，土壤降伏範圍將產生高度重疊，增加地錨支數無法有效提高地錨之錨碇力。本研究更進一步地由矩陣排列的3*3地錨分析中發現，因緊砂受剪膨脹之因素，致使中間地錨之錨碇力有大於外圍地錨錨碇力之現象。隨著地錨間距之增加，土壤降伏範圍之重疊區域隨之減少，群錨間之錨碇力不再受群錨效應的影響，而使錨碇力趨近於單錨行為。 |
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| 摘要(英)： | ||
| To investigate the horizontal spacing effects on anchor groups, a numerical methodology was adopted to study the interactive behaviors and load-displacement relations of 2 by 2 and 3 by 3 matrix-arranged anchors in dense sand. A continuous strain hardening-softening model of dilatant sand named “SHSOVOD”, and FLACish language of FLAC3D software were put together to perform the numerical analyses. The results of matrix-arranged anchors placed in different horizontal spacing are compared with the results of single anchors. It can be seen from the numerical results of matrix-arranged anchors, no matter which 2*2 or 3*3 anchor groups, when overburden depths of anchors are equal to 4D(D: diameter of an anchor) and 10D, there is virtually no interference for total load if anchors are installed in 8D apart horizontally. However, a horizontal space of 7D can eliminate the influence of anchorage capacity for matrix-arranged anchors placed in overburden depth of 16D. When anchors were installed closely, says, Z/D=4, yielding soil around each anchor superposes highly, anchorage capacity of anchor groups does not increased linearly with number of anchors. Moreover, according to the numerical results of 3*3 anchor groups, the anchorage capacity of the center anchor is greater than those of the others; the phenomenon is resulted from shearing dilation of sand during anchors pulled out. The superposition of yielding zones decrease as horizontal spaces increase, therefore the behaviors of these matrix-arranged anchors tend to behave independently as horizontal spaces increase to a critical value. |
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| 檔案： | 沒有相關檔案 | |
| 相關連結： | http://ethesys.lib.cyut.edu.tw/ETD-db/ETD-search-c/view_etd?URN=etd-0824107-162433 | |