姓名 |
陳國峻(Kuo-Chun
Chen) |
電子郵件信箱 |
s9411625@mail.cyut.edu.tw |
畢業系所 |
營建工程系碩士班(Department and Graduate Institute of Constrction
Engineering) |
畢業學位 |
碩士(Master) |
畢業時期 |
95學年第2學期 |
論文名稱(中) |
砂土中矩陣排列之群錨受力行為 |
論文名稱(英) |
Uplift Behavior of Matrix-Arranged Anchor Groups in Sand |
檔案 |
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|
論文使用權限 |
校內外都二年後公開 |
論文語文/頁數 |
中文/211 |
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。 |
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. |
關鍵字(中) |
群錨
錨碇力
沉泥質砂
矩陣排列
|
關鍵字(英) |
matrix-arranged
anchor groups
anchorage capacity
sity sand
|
口試委員 |
謝百鈎 - 召集委員
唐雨耕 - 委員
賴俊仁 - 委員
許世宗 - 指導教授
|
口試日期 |
2007-07-06 |
繳交日期 |
2007-08-24 |