Accuracy and Sensitivity Analyses on the Photogrammetry-Based Deformation Measurement Method

Recently, a novel photogrammetry-based method has been developed for unsaturated soil deformation measurements during triaxial testing. This method provides a simple and cost effective alternative to the conventional double-wall cell method. In this study, a validation test on a saturated sand specimen was conducted to evaluate the accuracy of the newly developed photogrammetry-based method. A sensitivity analysis was also carried out on the impact of the system parameters (i.e., cell wall thickness, refractive indices of water and cell wall) on the overall measurement accuracy. The refractive index of water was found to have the most significant impact on overall measurement accuracy of the photogrammetry-based method