Abstract
The short fiber mixing method is well known as one of the method to improve the strength of gran- ular soils in geotechnical engineering. Mechanical properties of the short fiber mixing granular materials are influenced by many factors, such as the mixture ratio of the short fiber, the material of short fiber, the length, and the orientation. In particular, the mixture ratio of the short fibers is very important in mixture design. In the past study, we understood that the strength is reduced by too much short fiber mixing by a series of tri-axial compression experiments. Namely, there is “optimum mixture ratio” in the short fiber mixing granular soils. In this study, to consider the mechanism of occurrence of the optimum mixture ratio, we carried out the numerical experiments by granular element method. As the results, we can understand that the strength decrease when too much grain-fiber contact points exist, because a friction coefficient is smaller than the grain-grain contact points.
Highlights
There is short fiber mixing reinforced soil which improves material strength by mixing short fibers with granular soil material whose performance is insufficient
By microscopic numerical experiments, we examine the mechanism that the optimum mixture ratio exists
When the friction angle between the particles of the short fibers is set to 27◦ which is the same as the soil particles, the maximum principal stress difference is larger at any mixture ratio compared to the case of the short fibers are not mixed
Summary
There is short fiber mixing reinforced soil which improves material strength by mixing short fibers with granular soil material whose performance is insufficient. In this method, short fibers made of polyethylene, polyester or natural palm having a length of about several cm are used. Since various causes such as length, diameter, rigidity, mixture ratio and orientation of short fibers are complicatedly involved in the short fiber mixing reinforced soil, it is very difficult to elucidate its mechanical characteristics and reinforcement mechanism only by macroscopic viewpoint. By microscopic numerical experiments, we examine the mechanism that the optimum mixture ratio exists. GEM is similar to Distinct Element Method (DEM), GEM solves the quasi-static equilibrium equation of discrete system
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