Abstract
The phenomenon of ground undergoing large plastic deformation, leading to collapse, occurs due to the localization of unstable deformation. The investigation of shear band is important in order to understand the destructive phenomenon. Therefore, a series of experiments were conducted on sands with different particle characteristics so that behaviour of the shear band of sand under plane strain compression could be investigated. Specifically, Toyoura sand and two kinds of coral sand, hereafter referred to as coral sand A (with smaller average particle size) and coral sand B (with larger average particle size) were used. The shear band was evaluated using PIV (Partial Image Velocimetry) analysis. As a result, it became clear that the relationship between shear inclination angle and internal friction angle does not hold for the two kinds of coral sand because the shear inclination angle is low. The ratio of the average value of the shear band width to the average grain size at the peak was 10 to 20 times, 7 to 10 times, and 5 to 8 times in the order of Toyoura sand, coral sand A, and coral sand B. The sample standard deviation was 0.1 to 0.9 mm, 0.9 to 1.6 mm, and 1.4 to 1.9 mm.
Highlights
The phenomenon that the ground undergoes large plastic deformation and destroys occurs due to localization of unstable deformation
When crushable materials are used, which are prone to fracture individual particles, it is thought that the influence is remarkably in the shear band where shear stress is applied [1] .In grasping the shear band of crushable sand, since the principal stress direction is defined by one plane, it is necessary to measure the strength deformation characteristics under the plane strain condition using a plane strain compression apparatus
In this study, a series of experimental studies were conducted with the aim of grasping the shear band of sand under plane strain compression, and using the PIV (Partial Image Velocimetry) analysis with picture of membrane which covered the specimen, the angle of the shear band and the width of the shear band study was carried out
Summary
The phenomenon that the ground undergoes large plastic deformation and destroys occurs due to localization of unstable deformation. The area where localization concentrates is called the shear band. Detailed investigation of this shear band is dynamically important in capturing destruction phenomena. The behaviour of the ground is varied depending on the type of sand even at the same confining pressure and density. When crushable materials are used, which are prone to fracture individual particles, it is thought that the influence is remarkably in the shear band where shear stress is applied [1] .In grasping the shear band of crushable sand, since the principal stress direction is defined by one plane, it is necessary to measure the strength deformation characteristics under the plane strain condition using a plane strain compression apparatus. In this study, a series of experimental studies were conducted with the aim of grasping the shear band of sand under plane strain compression, and using the PIV (Partial Image Velocimetry) analysis with picture of membrane which covered the specimen, the angle of the shear band and the width of the shear band study was carried out
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