Abstract
In China, traditional techniques for measuring structural subsidence cannot keep pace with the rapid development of critical national infrastructure such as the growing network of high-speed railways. Traditional monitoring methods using leveling instruments are inefficient and time consuming when monitoring structures like bridges and tunnels. Thus, a fast, economical, and more accurate and precise way to survey building subsidence is urgently needed to address this problem. This paper introduces a new close-range photogrammetry technique that deploys a fixed camera with tilt compensator to measure changes in height over small areas. A barcode subsidence mark that can be identified automatically during digital image processing replaces the leveling points used in traditional methods. Four experiments at different locations verified that results from the new method were stable and consistent with total station measurements. This approach is simple, inexpensive, and produces accurate and precise results as our evaluation results show.
Highlights
A growing number of public facilities such as the high-speed railways, subways, and underground corridors are under construction in China given the increased state investment in infrastructure construction
The common settlement dot are designed for a levelling rod, which cannot be used for photogrammetry
After inputting the ID and password of the camera in the login module, the camera can be added to the camera management module and the images taken by the camera can be displayed in the main window in real time
Summary
A growing number of public facilities such as the high-speed railways, subways, and underground corridors are under construction in China given the increased state investment in infrastructure construction. Given this rapidly changing and complex built environment, building settlement must be monitored in real time to ensure the safety and durability of structures during construction and operations. Leveling points are set up in corridors of different elevations and the basic deformation characteristics of the dam foundation are acquired through long-term monitoring data [3]. Facilities like high-speed rail lines are difficult to approach, making leveling using manual measurements unsuitable in many instances. Continuous manual infrastructure monitoring is time consuming and cannot meet the demanding requirements imposed by the pace of development [5]
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