Abstract
Localization in soil under high stress level is usually investigated using some indirect measures, e.g., X-ray diffraction method. In the present study, the propagation velocity of shear wave was used to detect localization in sandy soil. Firstly, the general expression to exhibit the stress and density dependencies characteristics under consolidation and triaxial testing conditions of the tested soil was proposed. Adopted the proposed correlation as a reference together with the observed geometry, the shear wave velocity of the localized zone may be assumed. It was found that the density in the localized zone could be much looser than those ever reported in the literature. The void ratio of the localized zone is even larger than the maximum void ratio.
Highlights
Localization is one of the most important phenomena determining the performance of laboratory tests
In sample of sandy soil, localization can be visually observed through shear bands
For the evolution of void ratio within shear bands of triaxial sand sample using the X-ray computed tomography technique, the local density inside shear band approaches a limited value of void ratio
Summary
Localization is one of the most important phenomena determining the performance of laboratory tests. The two most required variables in identification of shear bands are the thickness and density inside the localized zone. For the evolution of void ratio within shear bands of triaxial sand sample using the X-ray computed tomography technique, the local density inside shear band approaches a limited value of void ratio (critical void ratio). The propagation of shear wave through the body of localized sandy sample was adopted to averagely characterize the mechanism of shear band formation in drained triaxial tests[3]. The propagated shear waves travel through two main bodies of the sample, i.e., the intact and localized parts. Since the thickness of shear band cannot be determined using the current set-up of the equipment, only the dependent correlation between these two unknowns shall be determined
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