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標題: | 雷射掃描技術於隧道內空變位監測之應用 Utilizing LiDAR Technique in Monitoring Tunnel Deformations |
作者: | Yi-Hsuan Chiang 江怡萱 |
指導教授: | 韓仁毓 |
關鍵字: | 內空變位監測,變形分析,光達,現地特徵,最小距離投影法, tunnel deformation analysis,deformation signal,Light Detection and Ranging (LiDAR),in-situ features,minimum-distance projection (MDP), |
出版年 : | 2014 |
學位: | 碩士 |
摘要: | 台灣地形複雜多變,為便利交通聯絡,許多隧道應運而生。由於營運中的隧道安全直接影響使用者的人身安全,其監測及維護工作更顯重要,目前評估隧道安全穩定性的項目種類繁多,其中內空變位監測是重點項目之一。另一方面,雷射掃描技術(簡稱光達)因具有可快速且自動搜集三維空間資訊的優點,常被應用於工程領域之監測任務,惟光達蒐集之原始數據為隨機分佈的離散點雲,無法直接提供待測物的外顯幾何資訊,需要以資料後處理得到欲分析的資訊。本研究目的為建立一完整變形分析流程,以有效運用光達原始點雲的資料訊息,同時提高資料處理的效益,進而提供符合工程監測規範之隧道變位分析結果。研究中首先利用原始資料中的現地特徵,將多時期多測站光達資料整合至共同坐標基準,再建立隧道二維變形分析模型及隧道三維變形分析模型,進行全隧道變位訊號估計與品質評估。由數值模擬及現地實驗成果顯示,本研究方法具有高度的演算效率以及自動化潛能,並且能夠提供隧道完整而細膩的變位監測以及可靠度資訊,因此可作為現行隧道安全監測任務中一項具體可行的技術方案。 Monitoring tunnel deformation is a crucial task for assessing long-term safety of a tunnel. This task requires an accurate and high-resolution spatial technique to precisely retrieve the abnormal signals on a tunnel surface. Among many measurement techniques in monitoring tunnel deformations, the Light Detection and Ranging (LiDAR) technique is capable of collecting spatial data automatically and rapidly. Although raw LiDAR dataset contains useful and important information, it lacks explicit geometric interpretation. In this study, an efficient approach for establishing a tunnel model to analyze deformation signal with multi-epoch LiDAR datasets is presented. By utilizing in situ control features, tunnel profiles (2D model) and 3D tunnel model from multi-epoch LiDAR datasets can both be expressed in a common reference frame definition. Then the minimum-distance projection (MDP) algorithm is proposed to estimate the 2D and 3D deformation signals on a tunnel surface. Furthermore, a rigorous covariance propagation approach is introduced to provide explicit quality indications on the obtained solution. Based on the results of simulation tests and a real case study of Hsuehshan (Xueshan) Tunnel, it has been shown that the LiDAR technique makes possible an efficient and accurate solution for monitoring tunnel profile deformations when the proposed approach is implemented in such task. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/5415 |
全文授權: | 同意授權(全球公開) |
顯示於系所單位: | 土木工程學系 |
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ntu-103-1.pdf | 10.19 MB | Adobe PDF | 檢視/開啟 |
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