高速铁路级配碎石颗粒三维形态特征多尺度分析

doi:10.13722/j.cnki.jrme.2021.0624

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Abstract The particle morphology of graded gravels of high-speed railway subgrade has a significant impact on the macro-mechanical properties. Reasonably quantifying the three-dimensional morphological characteristics of the particles is the basic work of the research on the micro-mechanism of fillers. Based on the laser scanner，the point cloud data of 700 gravel particles in 7 particle groups in the range of 2.36–31.5 mm are acquired. And these data are reconstructed to form three-dimensional grid models. By introducing the root mean square curvature (RMS) which describes the surface unevenness of the particles and considering the particle mesh model smoothing process and the RMS curvature distribution characteristics，the angularity parameters are defined by the proportion of the point cloud quantity in the edge area，and the texture parameters are defined by the difference of the model before and after smoothing. Combined with the shape parameters described by the relationship between the long，middle and short axes，the indexes system to describe the multi-scale morphological characteristics of gravel particles is formed. By selecting the particles with typical morphological characteristics，it is verified that the established index system has a good morphology discrimination ability. According to the statistical analysis of the scanned gravel particles，the shape，angularity and texture of the gravel particles in different groups basically present the characteristics of normal distribution. As the particle size increases，the proportion of block particles increases，and the angularity and the texture characteristics are more prominent. The research results can provide a reference for the quantitative evaluation of particle morphological characteristics from macro，medium and micro scales.

Key words： soil mechanics graded gravel three-dimensional morphological characteristic RMS curvature angularity texture

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	LU Rui1
	2
	LUO Qiang1
	2
	LIU Gang3
	ZHAO Chunfa4
	HE Xinyi3

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LU Rui1,2,LUO Qiang1, et al. Multi-scale analysis of three-dimensional morphological characteristics of graded gravel on high-speed railway[J]. , 2022, 41(S1): 3091-3100.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0624 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS1/3091

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