Application of Close-Range Photogrammetry for Post-Failure Reconnaissance of a Retaining Wall
Part Of
Geotechnical Hazards from Large Earthquakes and Heavy Rainfalls
Start Page
503
End Page
512
ISBN (of the container)
9784431562054
9784431562030
ISBN
9784431562030
9784431562054
Date Issued
2016
Author(s)
Abstract
Typhoons and earthquakes are common natural disasters in Taiwan, and both tend to cause failures of geotechnical structures. Consequently, there is much demand for rapid post-failure reconnaissance. 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 in this research to develop an indirect reconnaissance method for geotechnical structures. 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 M L = 6.5 earthquake occurred on June 2, 2013 in middle 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 rapid reconnaissance of geotechnical structures after failures occurred.
Subjects
Close-range photogrammetry
Geotechnical structures
Post-failure reconnaissance
Relative orientation
Publisher
Springer Japan
Type
book part