Abstract
Soil reinforcement with natural or synthetic fibers enhances its mechanical behavior in various applications. Fiber-reinforced sands (FRS) can be relatively anisotropic because of the fiber self-weight and the compaction technique. However, the microscopic mechanisms underlying the anisotropy are still poorly understood. This study used a discrete element approach to analyze the microscopic mechanisms underlying the strength anisotropy of FRS due to fiber orientation. Analysis of contact networks revealed that the optimum fiber orientation angle is perpendicular to the main direction of strong contact force in direct shear testing. These fibers produced the largest increase in shear zone thickness, normal force around the fiber body, effective contact area, tensile force along fibers, and energy storage/dissipation. This study is valuable for further understanding of the mechanical behaviors of FRS.
Highlights
In geotechnical engineering, various soil reinforcement techniques have been commonly used to enhance the engineering properties of soil
ToTo evaluate the effect ofof different fiber orientations onon the mechanical reinforcement, a series ofof numerical direct shear tests were performed on
The results show that variation of CN for sand–fiber contacts is observed due to fiber orientation
Summary
Various soil reinforcement techniques have been commonly used to enhance the engineering properties of soil. Of particular concern is the strength of fiber-reinforced soils (FRS), which varies according to different fiber and soil properties. The principal advantages of fiber-reinforced soil are generally considered to be the relative isotropy of the composite material, and many researchers have assumed isotropy for simplicity during analysis [22]. The principal advantages of fiber-reinforced soil are generally considered to be the relative isotropy of the composite material, and many researchers have assumed isotropy for simplicity. This article places on the analysis of the cause of the shear strength anisotropy of fiber reinforced sands (FRS)emphasis induced onathe analysis oforientation the cause of shear strength by preferential ofthe fibers with. Anisotropy of fiber reinforced sands (FRS) induced by a preferential orientation of fibers with DEM DEM. anisotropy of fiber reinforced sands (FRS) induced by a preferential orientation of fibers with DEM
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