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| By using reconstructed Microcosmic Test System, and via the uniaxial compression test on cemented soil in different cement content, compaction degree, and age, study the regularity of the inside micro-structure change of cemented soil in the process of initiation of shear band. The study demonstrates that: the process of cemented soil shearing includes the initial loading stage, the local deformation development stage, and the destruction stage. The initiation and development of shear band are at the anaphase of local deformation development stage, which is toward peak of stress. The process of initiation of cemented soil shear band could be described through the variation of fissure area ratio (FAR), fissure distribution fractal dimension (FDFD), particle orientation degree (POD) and particle distribution fractal dimension (PDFD). In the shear failure process of cemented soil, the change of parameters (FAR, FDFD, POD, PDFD) also could be divided into three phases on the basis of shear band's initiation, development and breakthrough. With the axial strains increasing, the FAR gradual increase, FDFD presents a slight downward trend and then increased gradually, POD decrease gradually, PDFD presents a slight upward trend, and subsequently decreased. All the parameters (FAR, FDFD, POD, PDFD) are stable in the later stage. The process of uniaxial compression test is the process of gradual consolidation, and is the process of shear band's initiation, development and breakthrough. |
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| Keywords:Cemented soil; Shear band; Micro-structure; Uniaxial compression test; Quantitative analysis. |
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