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碩士論文公告區 |
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| 年度： | 94 | |
| 姓名： | 唐小雯(Hsiao-Wen Tang) | |
| 論文題目(中)： | 沉泥質砂土中背拉式地錨之錨碇行為 | |
| 論文題目(英)： | Anchorage Behavior of Tied-Back Anchors in Silty Sand | |
| 摘要(中)： | ||
| 本文使用SHASOVOD模式(A Strain Hardening-Softening and Volumetric Dilatancy Model)結合FLAC3D軟體進行沉泥質砂土中背拉式地錨之錨碇行為的數值分析，並以現場試驗結果驗證數值分析程式的適用性，再進行參數研究。 由研究結果發現，數值分析與現場試驗的結果吻合。承拉式摩擦型地錨之錨碇力主要係來自摩擦力。當相對密度較高或錨碇段長度較長，於地錨達極限拉拔力時，其降伏範圍也較大。降伏面是否會發展至地表或觸及連續壁與覆土深度H和埋入深度Z有關，本文由數值分析結果建議出最小覆土深度與最小埋入深度。 無論是增加埋入深度、覆土深度或錨碇段長度皆可提升地錨之錨碇力，其中以增加錨碇段長度來提升錨碇力之效果為最佳，單位錨碇長度之錨碇力增量約為55kN/m，當錨碇段超過30m之後，其增加效果已呈低於線性之方式增加，此因地錨錨碇段周圍土壤的摩擦應力有漸進式降伏行為所致。在不同傾斜角度下，改變埋入深度、覆土深度或錨碇段長度時，其尖峰摩擦力下之側向土壓力係數Kf均小於被動土壓係數Kp，但大於靜止土壓力係數K0，且Kf值隨傾斜角度的增加而減少。 |
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| 摘要(英)： | ||
| A constitutive model for silty sand named “SHASOVOD” combined FLAC3D software was used to study the anchorage behavior of tied-back anchors in silty sand. A field test program was conducted to verify the applicability of the numerical program; the parametric studies were then carried out by numerical analyses. It was found that the numerical results are in a good agreement with those by field tests. The friction force dominates the anchorage capacity of a shaft tension anchor. Whether the yielding zone of an anchor develops to ground surface and structural wall or not depending on the overburden depth H and the embedded depth Z, this study have been suggested the minimum overburden depth Hmin and minimum embedded depth Zmin herein. It can be found, as the relative density of soil or the fixed length of an anchor increased, the yielding zone also expanded. When the embedded depth, the overburden depth or the fixed length of an anchor increased, the anchorage capacity also increased. Increasing fixed length should be a better method to increase the anchorage capacity; ultimate load per unit fixed length was about 55kN/m. However, when the fixed length of an anchor is greater 30 m, the incremental of anchorage capacity per unit fixed length was decreased due to progressive yield of friction stress along fixed end. According to the numerical results, when the inclination angle, overburden depth, embedded depth, or fixed length increased, the coefficient of lateral earth pressure Kf decreased. The coefficient Kf always less than the coefficient of passive earth pressure Kp; however, it was greater than the coefficient of earth pressure at rest K0. |
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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-0821106-092939 | |