Measurement system of shear banding formation of granular materials based on the particle image velocimetry(PIV) with the image processing device and the meshless analysis system for bifurcation behavior of the specimen

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During a period of research project, an experimental device and the measurement system of localized deformation within saturated sand specimen during shear are constructed based on the particle image velocimetry(PIV) and the image processing device. Lateral image of the plane strain compression experiment under undrained condition using saturated Toyoura sand specimen is recorded by the high-speed video and the planar soil deformation is analyzed through the movement of a fine mesh of soil test patches on the image texture. These measurements are converted to the strain and the vortex distribution appeared in the lateral plane of specimen during the shear. After reviewing the underlying strategy of the PIV, a special focus is placed on the evolution of localized strain and vortex pattern. The mesh-free analysis program for solving soil-water coupled problem is also developed within the framework of finite strain to capture the localized profile of deformation of the specimen.