Abstract：Volume and deformation measurement is in great significance for characterizing soil and rock mechanical behavior. In this paper，a new dynamic image-based multi-camera and multi-media photogrammetric method is proposed to measure soil deformation during triaxial testing under dynamic loading. With videos captured by multiple cameras from different view angles，dynamic images can be extracted. Together with the camera calibration results based on dynamic images and the multi-media photogrammetric method，volume and deformation of soil during triaxial testing can be measured under dynamic loading. With help of a six single lens reflex camera video capturing system，triaxial test was conducted on a steel cylinder and two silt specimens to validate the feasibility and full-field deformation measurement capability of the proposed method. Triaxial test on steel cylinder shows that the volume measurement can be made based on dynamic images at a high accuracy. The result from the triaxial test on silt specimens demonstrates that the proposed method is capable of continuous soil volume and full-field deformation measurement under dynamic loading. The proposed method overcomes the limitations associated with the conventional methods and extends the application of the multi-media photogrammetric method from static loading condition to dynamic loading condition. Continuous volume and full-field deformation measurement are beneficial for advanced characterization of soil behavior under dynamic loading.
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2023, Vol. 42 
