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Characterisation of soil deformation over wide strain ranges in triaxial test with high-precision stereophotogrammetry
| Title: | Characterisation of soil deformation over wide strain ranges in triaxial test with high-precision stereophotogrammetry |
| Authors: | Nishimura, Satoshi Browse this author →KAKEN DB |
| Keywords: | deformation | | laboratory testing | | stiffness | | triaxial shearing |
| Issue Date: | 21-Apr-2022 |
| Publisher: | ICE Publishing |
| Journal Title: | Géotechnique |
| Volume: | 73 |
| Issue: | 12 |
| Start Page: | 1071 |
| End Page: | 1086 |
| Publisher DOI: | 10.1680/jgeot.21.00067 |
| Abstract: | Stereophotogrammetry was adopted as a means to measure three-dimensional displacements of a soil specimen surface in triaxial tests. New developments include an efficient algorithm that resolves the relative displacements with high precision to the order of 10(-3) mm, and strains in common-sized soil specimens to the order of 10(-3)%, while correcting for ray refraction effects caused by the pressure cell wall and water. The system, requiring only sets of compact-type digital cameras as hardware, allows a stiffness-strain curve to be determined over wide strain ranges spanning from 10(-3)% to virtually any large strain with a fixed configuration. This paper explains the proposed image analysis processes, which combine a ray tracing formulation by Zhang and co-workers, particle tracking velocimetry and sub-pixel digital image correlation in efficiently deriving accurate and precise relative displacements. Rigorous assessment of the accuracy and precision was conducted. As a demonstration, two undrained triaxial compression tests on reconstituted clay were performed with and without end lubrication. Both for small-strain (<0 center dot 05%) axial loading-unloading cycles and for monotonic loading to large axial strain (15%), the strain development was tracked and the specimen behaviour was characterised. These tests demonstrate that the new technique can be a useful option in a soil laboratory both for research and practice. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/88984 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 西村 聡
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