應用透地雷達探測柔性鋪面下管線埋設之初步研究

Application of GPR on Underground Utilities Investigation of Flexible Pavement

賴鴻穎(Hong-Yin Lai)

指導教授 ： 林商裕

朝陽科技大學/理工學院/營建工程系/碩士(2009年)

摘要

一般大地工程中，經常遭遇到許多地下結構物與埋設物之問題，傳統上常採用鑽探及明挖來探測，但此兩方式所需時間及經費都過於龐大，若補充以透地雷達非破壞探測技術探測柔性鋪面下管線與空洞之位置，應能更快速、經濟的改善調查之品質。
本研究採用100MHz、250MHz與500MHz之MaLa透地雷達天線頻率，配合RAMAC Ground Vision解析軟體，藉由朝陽科技大學非破壞試驗場與中科汙水管工程(一、二標)進行現地試驗、影像蒐集、濾波處理與影像辨識分析，判斷柔性鋪面下管線與空洞之可能位置。
結果如下：(1)不同材質的管線於影像圖中特徵也會有所不同。(2)管徑的大小不容易經由透地雷達法所得之影像圖來進行判斷。(3)不同深度探測應選擇適當之不同天線頻率進行探測。(4)DC濾波加水平濾波再加增益處理之濾波方式，較容易判斷鋪面下之管線；而DC濾波加上Automatic gain control濾波，較容易判斷道路介層之分界。(5)因水的介電常數大，故於管內含水的狀況下，較不容易判斷管線之位置。(6)現地試驗中，因地表地質不同與地下水位高低，導致雷達波能量衰減與消散之幅度不一樣。

關鍵字

透地雷達 ； 天線頻率 ； 柔性鋪面 ； 濾波處理 ； 介電常數

並列摘要

In the field of Geotechnical Engineering, it is very often to encounter some problems about underground structure and burier. Traditionally, boring and the excavation are the common used methods in the project. As we know, the huge consumption of time and expense for these methods is always a problem. However, this problem can be solved by NDT of radar waves. Using ground penetrating radar, one can easily detect the pipes and holes under the flexible pavement. As a result, less time and cost will be needed, and the accuracy of the determination will be highly improved.

This investigation use radar waves with antenna frequency of 100,250 and 500MHz to locate the possible position of pipes and holes under the flexible pavement in Chaoyang University Technology and sewage pipes of Central Taiwan Science Park(1st,2nd). The software of RAMAC Ground Vision is used to analyze the images and datas.

Result as following: (1)Pipes of different material show variously in their images. (2)It is not easy to identify the pipes of different diameters via radar waves. (3)To have a better result, one needs to use radars of different frequency for the area of different depth. (4)Using DC filter together with Subtract Mean Trace filter and Time Gain filter, one can clarify the underground pipes easily. If using Automatic Gain Control filter instead of Subtract Mean Trace filter and Time Gain filter,one may identify the boundary of road sublayers easier. (5)Because of the large dielectric constant of water, it is not easy to determine the location of pipes if it contains water inside. (6)Radar wave decays differently in different geological structures, although does it in the field of different water levels.

並列關鍵字

Filter ； Dielectric Constant ； Flexible Pavement ； Ground Penetrating Rader ； Antenna Frequency

參考文獻

33. 陳敬寬，「水利堤防孔洞檢測分析及其資料庫建立之研究」，國立成功大學土木工程研究所，博士論文，台南，2005。

34. 許程翔，「透地雷達對地下管線探查之應用研究」，國立成功大學土木工程研究所，碩士論文，台南，2003。

30. 施議傑，「透地雷達試驗結果判釋之初步研究」，國立成功大學土木工程研究所，碩士論文，台南，2002。

16. 台灣世曦工程顧問，「台中科學園區污水放流管線工程地質調查報告書」，台灣世曦工程顧問股份有限公司，2008。

2. Beres, M. J. and Haeni, E. P., “Application of ground-penetrating-radar methods in hydrogeologic studies,”Ground Water, Vol. 29, No. 3, pp. 375-386, (1991).