| 研究生: |
陳亮元 Chen, Liang-Yuan |
|---|---|
| 論文名稱: |
透地雷達之振幅掃描對地下管線探測之案例探討 Case Study on Underground Pipeline Detection by A-Scan of Ground Penetrating Radar |
| 指導教授: |
倪勝火
Ni, Sheng-Huoo |
| 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: | 2024 |
| 畢業學年度: | 112 |
| 語文別: | 中文 |
| 論文頁數: | 141 |
| 中文關鍵詞: | A-scan 、B-scan 、透地雷達 、地下管線 、非破壞性檢測 |
| 外文關鍵詞: | A-scan, B-scan, ground penetrating radar, underground pipelines, nondestructive testing |
| 相關次數: | 點閱:74 下載:2 |
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本研究將許程翔(2003)等過去在砂地進行透地雷達實驗室試驗的研究數據以透地雷達A掃描(A-scan)和B掃描(B-scan)的方式進行分析,並將PVC管探測深度與實際埋置深度進行比較。此外,將此分析方法應用至新市底片廠廠外原水管路線的透地雷達現地試驗,透過A-scan和B-scan兩種透地雷達探測方式確認地下管線或孔洞的位置。
研究方法主要以A-scan的成像方式進行檢測,並輔以B-scan的方式去辨識地下管線或孔洞的存在。確認異物的大致位置後,透過A-scan的波形圖,分析入射波的極性和反射波強度的變化。並根據反射係數的相關公式和相對介電常數的數值表可以推論出地下物質為何。
研究結果顯示,實驗室試驗探測所得的PVC管線埋置深度與實際埋置深度十分接近,但仍有些許的誤差,判斷可能為埋置時土壤的平整度或PVC管徑的大小所導致。將此原理應用至新市底片廠廠外原水管路線進行分析,透過A-scan和B-scan兩種探測方法的相互比較,可以更準確地判別地下物質。
This study analyzes the data from ground-penetrating radar (GPR) laboratory experiments conducted by Hsu Cheng-Hsiang (2003) and others in sandy soils using A-scan and B-scan methods. The detection depth of PVC pipes is compared with the actual burial depth. Additionally, this analytical method is applied to the GPR field tests along the raw water pipeline route outside the Xinshi Film Factory, using A-scan and B-scan to confirm the location of underground pipelines or cavities.
The research methodology primarily involves detecting with the A-scan imaging method, supplemented by B-scan to identify the presence of underground pipelines or cavities. After confirming the approximate location of the anomalies, the polarity of the incident wave and the changes in the intensity of the reflected wave are analyzed using the waveform graph from A-scan. Based on the reflection coefficient formulas and the values of relative permittivity, inferences can be made about the nature of the underground material.
The results show that the detected burial depth of PVC pipelines in the laboratory experiments is very close to the actual burial depth, though there is a slight discrepancy, which may be attributed to the soil’s levelness or the diameter of the PVC pipe during burial. Applying this principle to the analysis of the raw water pipeline route outside the Shinshi Film Factory, the comparison between A-scan and B-scan detection methods allows for more accurate identification of underground materials.
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