CHEN Cheng, LIU Xiaoqing, LUO Zhengdong, NING Zhiqiang. 2016: STUDY OF STRENGTH AND DEFORMATION CHARACTERISTIC OF UNBOUND GRANUAL MATERIAL WITH DIFFERENT GRAIN COMPOSI-TION. JOURNAL OF ENGINEERING GEOLOGY, 24(6): 1191-1198. DOI: 10.13544/j.cnki.jeg.2016.06.019
    Citation: CHEN Cheng, LIU Xiaoqing, LUO Zhengdong, NING Zhiqiang. 2016: STUDY OF STRENGTH AND DEFORMATION CHARACTERISTIC OF UNBOUND GRANUAL MATERIAL WITH DIFFERENT GRAIN COMPOSI-TION. JOURNAL OF ENGINEERING GEOLOGY, 24(6): 1191-1198. DOI: 10.13544/j.cnki.jeg.2016.06.019

    STUDY OF STRENGTH AND DEFORMATION CHARACTERISTIC OF UNBOUND GRANUAL MATERIAL WITH DIFFERENT GRAIN COMPOSI-TION

    • To study the strength and deformation characteristic of unbound granular materials of high-speed railway, a granular flow model is established with the internal FISH language of three-dimensional particle flow code PFC3D. Meanwhile, the micro parameters of unbound granular materials are calibrated with the conventional triaxial test results. Considering the influence of the curvature coefficient and the uniformity coefficient on the grain size distribution, five kinds of different grain composition of unbound granular materials are simulated under three different confining pressures. The results show that:There is a predominant factor in the curvature coefficient of unbound granular materials. The differences between the effective size, median diameter and constrained size can't be allowed too large, because the strength behaviors of the unbound granular materials with large curvature coefficient and uneven coefficient performances are higher than the others, and the deformation behaviors become more and more large. The non-uniformity coefficient is another important factor on the strength and deformation behavior of unbound granular materials. With the larger non-uniformity coefficient and well-graded granular materials won't changing the force chain distribution under the different stress condition, and the extrusion becomes more obvious and the transfer and distribution of force are more uniform.
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