Analysis of the Deformation Field in the Direct Shear Test with Use of DPDM

摘要

To study the deformation of soil when interacting with structure, this paper macroscopically analyzes sand deformation field through the direct shear test with sand and steel plate. The test used the invisible semi-model shear device to take photo of experimental process for analysis by digital photography-based deformation measurement(DPDM) technique. The results show that during the process of interaction between dense sand and structure, the influence made by normal stress is more significant than that of compactness. As the normal stress grows, the compactness, the maximum shear stress and the bulk strain of medium sand correspondingly increases. At the beginning of shear, sand far from the plate displays shear shrink while sand close to the plate shows partial shear dilatancy.