| 研究生: |
康文瑋 Kang, Wen-wei |
|---|---|
| 論文名稱: |
邊坡之基礎承載力分析 Analysis of ultimate bearing capacity of rigid footing placed on the slope |
| 指導教授: |
黃景川
Huang, Ching-chuan |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 土木工程學系 Department of Civil Engineering |
| 論文出版年: | 2007 |
| 畢業學年度: | 95 |
| 語文別: | 中文 |
| 論文頁數: | 102 |
| 中文關鍵詞: | 承載力 、邊坡 |
| 外文關鍵詞: | bearing capacity, slope |
| 相關次數: | 點閱:186 下載:6 |
| 分享至: |
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摘 要
目前,關於位於邊坡上基礎受到地震力影響時承載力表現的分析或經驗公式並不多,故本研究針對坐落於斜坡上之剛性基礎以嚴密Janbu切片法作擬靜態分析求得地震時的承載力係數Nγ ,並將基礎受到傾斜載重、土體受到水平慣性力之影響定出修正係數,以常見的坡角、載重傾斜角經驗公式決定本研究之公式模式。另外顯示出水平地盤上基礎於地震時分析得到之Nγ 、修正係數與其他研究互相比較,其值和文獻中所提及之Nγ、修正公式均有相同的趨勢,而且公式計算值和分析值幾乎相同,所以利用這些公式可以估計靜置於坡肩的剛性基礎於地震時的極限承載力。
另外也對基礎後退時Nγ 上升情形分析,得到不受坡角影響的距離和後退時之修正係數,以此可以計算剛性基礎在符合所需求的承載力下其安全距離為何,提高其安全性。
ABSTRACT
At present, analytical or empirical formula for seismic bearing capacity of footings adjacent to the slope is rather limited. This study uses a pseudo-static-based approach in conjunction with rigorous Janbu’s slice
method to derive analytical values of seismic bearing
capacity factors (Nγ) and correction factors for the effects of inertia of soil mass and load inclinations for a rigid footing adjacent to the slope. It is shown that both
the bearing capacity factors (Nγ) and the correction
factors for the seismic bearing capacity of footings placed on level ground derived herein are comparable with those reported in the literature. Empirical equations regarding the effects of slope angles and load inclinations,expressed using generalized forms of those proposed in the literature, are also derived. It is also found that the empirical equations derived in the present study provide
values of correction factors in good agreements with the analytical ones,
indicating the validity of using these empirical equations for assessing the bearing capacity of rigid footings
situated on the slope subjected to pseudo-static seismic loading.
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