| 姓名 | 賴昆輝(Kun-Hai Lai) | 電子郵件信箱 | s9411626@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) | 尺寸效應對基樁阻抗縱剖分析法檢測訊號之影響 | |||
| 論文名稱(英) | Dimensional Effect on the Signal of Impedance Log Pile Integrity Testing | |||
| 檔案 |
請遵守中華民國著作權法之相關規定，切勿任意重製、散佈、改作、轉貼、播送，以免觸法。 |
論文使用權限 | 校內外完全公開 | |
| 論文語文/頁數 | 中文/68 | |||
| 摘要(中) |
基樁等基礎工程一但埋入土層或水面下，其缺陷諸如頸縮、鼓脹、孔洞、斷裂等極不易查覺，早期驗收各項重要公共工程時，採用大型靜載重或高應變動力試驗，不僅須動用大型機具，費用甚鉅，耗時費力，且僅進行部份抽樣檢測，對於整體工程品質，易產生偏頗或疏漏之現象；此外試驗所需施加之外力甚大，檢測基樁極易造成無法回復之損害，因此發展出一套不傷害基樁主體、迅速、低成本且涵蓋性廣泛之檢測技術，將是未來的重要發展方向。 2006年Yu等﹝1﹞依據阻抗縱剖分析法（IL）之基本理論推導過程，將基樁視為一細長桿件，成功模擬含定斷面頸縮與鼓脹之阻抗剖面，根據該研究發現IL法對於檢測基樁之完整性極具可行性，然而實際基樁檢測過程中存在薄松比(Poisson's effect)效應之影響，本研究應用ANSYS數值模擬軟體，採二維軸對稱方式進一步探討真實基樁檢測行為中薄松比效應對IL法檢測結果之影響，研究結果發現敲擊時間＞300us（導入之波長大於3倍基樁直徑），可透過接收器距敲擊源之擺放距離減少薄松比效應之影響，此外檢測基樁之頸縮缺陷深度過大，會降低IL法檢測訊號之準確度，反之缺陷漫延長度較長，則IL法所獲得之檢測訊號準確度較高。 |
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| 摘要(英) | The
defects such as neck and bulge of piers and piles are very
difficult to defect when these deep foundations are buried under
ground or below the water surface. In the past, static loading
tests or High-Strain Dynamic tests were carried out to
investigate the capacity of these foundations. But they waste
time and money and can only test very few samples. Furthermore,
these experiments utilize huge force which may cause
unrecoverable damage to the foundations. For these reasons, to
find out a method to defect the defects in the pile more
efficient and cost less is one of the most important developing
direction in the near future. Yu and Liao(2006) developer an Impedance Log technique to obtain the integrity of piles. They performed 1-dimensional numerical simulation and found that this technique can successfully obtain the impedance profiles of piles with necks and bulges. However, the piles may subject to 3-dimensional effects in the field. Therefore, numerical studies were performed in this thesis to study the dimensional effects on the signal of Impedance Log Method. Results of these studies indicate that if the wave length of the impact is greater than 3-times the diameter of piles, the passion`s effect can be minimized by placing the receiver half way between the center and the edge of the pile top surface. The IL method can obtain more correct impedance profile of a pile if its necking is shallower in depth and longer in length. |
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| 口試日期 | 2007-07-24 | 繳交日期 | 2007-08-23 | |