不同樁排列方式之自承式鋼軌樁擋土系統之離心模擬

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呂韋成(Wei-cheng Lu) 查詢紙本館藏

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土木工程學系

論文名稱

不同樁排列方式之自承式鋼軌樁擋土系統之離心模擬
(BEHAVIOR OF CANTILEVER SOLDIER-PILED WALLS WITH DIFFERENT PILE ARRANGEMENTS)

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摘要(中)

自承式鋼軌樁開挖工法，適用於良好地質條件下的大面積地下室
開挖工程，具有成本低廉及易於堅硬土層施工與施工快速等優點。使
用自承式雙排鋼軌樁開挖工法的主要目的，在於提高鋼軌樁擋土系統
的勁度，減少水平支撐設施的使用，提高人員施作效率、縮短施工工
期與增加開挖深度。
本研究利用離心模型試驗，藉由模擬開挖過程，探討於砂土層中
以自承式鋼軌樁擋土系統作為擋土設施時，改變雙排鋼軌樁排間距與
樁長或利用三排鋼軌樁等不同的樁排列方式，對自承式鋼軌樁擋土系
統穩定性的影響。另外亦探討在不同的開挖與貫入深度比下，不同樁
排列方式之擋土系統對鄰近地盤之影響程度。
研究結果顯示，砂土層中以自承式雙排鋼軌樁擋土系統作為擋土
設施時增大排間距或以三排樁作為擋土設施時，能有效的降低因開挖
所引致的地表沉陷、牆體變位與樁身的受力，有助於擋土系統之穩
定；而增長雙排鋼軌樁擋土系統之樁長有助於開挖深度的增加。因開
挖所引致之地表沉陷槽皆屬於三角槽型，且影響範圍皆為鋼軌樁擋土
壁壁後1.2 倍樁長。從試驗結果得知，將雙排與三排鋼軌樁擋土系統
視為一等值單排鋼軌樁擋土系統來進行穩定分析，為一可行之方法。

摘要(英)

Self-supported soldier pile wall system is eminent for its superiority
on low cost and easy construction when being applied in the vertical
excavations. Its advantages are reducing the deflection of the retaining
wall, shortening the working hour and increasing the depth of excavation.
In this research, a series of centrifuge modeling tests were conducted
to simulate the process of excavation with self-supported soldier pile wall
retaining system. The simulations of various excavation depths with
different spacing between the front and rear row piles in double-row-pile
or the triple-row-pile wall system were being carried out to study the
effects upon adjacent area.
The test results show that the self-supported double soldier pile wall
system can effectively reduce the surface settlement, horizontal
displacement, tilt angle and maximum bending moment. In the
double-pile-row retaining wall system, with the increase of the distance
between the front and rear row makes the retaining wall become more
stable. Increasing the quantity of rows of retaining wall system can
reduce the deformation and improve the stability of the double-pile-row
retaining wall system. Increasing the length of piles of retaining wall
system can reduce the deformation and improve the stability of the
retaining wall system, and can also effectively increase the depth of
excavation. When a self-supported soldier wall was selected to be the
retaining system in sandy layer, the shape of the ground settlement
induced by the excavation in this study was a triangular one. The affected
area was 1.2 times the pile length behind the wall. According to this
research, the multi-pile-row retaining wall system can be treated as a
equivalent single row system, and a simplified stability analyzing method
is fully adopted.

關鍵字(中)

★ 開挖
★ 鋼軌樁
★ 雙排樁
★ 自承式鋼軌樁

關鍵字(英)

★ Excavation
★ Double-rail pile wall
★ Self-supported soldier pile
★ Soldier pile

論文目次

中文摘要.............................................................................Ⅰ
英文摘要.............................................................................Ⅱ
目錄.........................................................................................Ⅲ
表目錄...................................................................................Ⅴ
圖目錄...................................................................................Ⅵ
照片目錄.............................................................................Ⅹ
符號說明.............................................................................XI
第一章序論.............................................................................1
1-1 序…...........................................................................................1
1-2 研究動機及目的.......................................................................2
1-3 研究架構...................................................................................2
1-4 論文內容...................................................................................3
第二章文獻回顧.....................................................................4
2-1 懸臂式擋土牆分析理論...........................................................4
2-2 現場觀測分析………...............................................................9
2-3 數值分析方法.........................................................................12
2-4 物理模型試驗.........................................................................14
2-4-1 1g 下之物理模型試驗..............................................................14
2-4-2 離心模型試驗...........................................................................15
2-5 離心模型原理.........................................................................21
2-5-1 離心模型之基本相似律...........................................................22
2-5-2 離心模型試驗之模型模擬.......................................................25
第三章試驗土樣、儀器設備及試驗方法............................52
3-1 試驗土樣.................................................................................52
3-2 試驗儀器及相關設備.............................................................52
3-2-1 地工離心機...............................................................................52
3-2-2 模型試驗箱...............................................................................53
3-2-3 移動式霣降機...........................................................................54
3-2-4 模型鋼軌樁檔土系統...............................................................56
3-2-5 開挖模擬系統...........................................................................57
3-2-6 相關量測儀器...........................................................................57
3-3 砂試體準備與試驗步驟.........................................................58
3-3-1 試體準備...................................................................................58
3-3-2 離心模型試驗...........................................................................59
第四章試驗結果與分析.......................................................82
4-1 試驗種類與回歸分析.............................................................82
4-1-1 試驗種類…………..............................................................83
4-1-2 回歸分析…………..............................................................84
4-2 鋼軌樁樁身彎矩分佈.............................................................86
4-2-1 雙排鋼軌樁之彎矩分佈............................................................86
4-2-2 三排鋼軌樁之彎矩分佈............................................................88
4-2-3 雙排鋼軌樁與三排鋼軌樁之彎矩分佈比較............................90
4-3 鋼軌樁樁頂水平變位與地表沉陷.........................................92
4-3-1 鋼軌樁樁頂水平變位...............................................................92
4-3-2 地表沉陷型態...........................................................................95
4-3-3 地表沉陷槽分佈範圍...............................................................97
4-4 鋼軌樁樁頂旋轉角與樁體變形分析...................................99
4-4-1 鋼軌樁樁頂旋轉角.................................................................99
4-4-2 鋼軌樁樁體變形分析.............................................................101
4-5 鋼軌樁樁體剪力與地盤反力分析.......................................104
4-5-1 樁身所承受之剪力.................................................................104
4-5-2 地盤反力分析.........................................................................105
4-6 自承式鋼軌樁擋土系統穩定分析.......................................107
4-6-1 單排鋼軌樁擋土系統.............................................................107
4-6-2 雙排鋼軌樁擋土系統.............................................................110
4-6-3 簡化穩定分析……….............................................................112
第五章結論與建議.............................................................170
5-1 結論.......................................................................................169
5-2 建議.......................................................................................170
參考文獻.................................................................................172

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指導教授

李崇正(Chung-Jung Lee)

審核日期

2008-10-23

推文