| 英文摘要 |
Regarding the fact that geotechnical structures tend to be damaged by natural disasters such as typhoons and earthquakes in Taiwan, this research aims to develop methods for rapid damage assessment of geotechnical structures. Because the failure sites of geotechnical structures are usually not easily accessible and direct measurements will be not possible in such situations, close-range photogrammetry, which gives accurate spatial information about an object at a certain distance, is utilized. For any object that is recorded in a pair of images from different viewpoints, its relative three-dimensional geometry can be reconstructed without ground control points using relative orientation between conjugate points in the image pair, along with a reference scale provided by any in situ object with a known length. Consequently, the local displacement and deformation of a geotechnical structure can be solved using this method and its damage state can be evaluated accordingly. A retaining wall, which was damaged in an ML = 6.5 earthquake in the middle of Taiwan, is chosen as a case study. Results show that the forward displacement on the top of the wall can be obtained using close-range photogrammetry based on the relative orientation between an image pair with good precision. Thus, the proposed method is verified to be applicable for the post-failure rapid reconnaissance of geotechnical structures. |
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