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建立考虑颗粒破碎的随机散粒体的SGDD数值模型,进行堆石体细颗粒截断粒径的敏感性分析,对三组不同截断粒径的数值试样进行不同围压的常规三轴试验,分析截断粒径对堆石体力学特性的影响并研究其细观机理.研究结果表明,在保持相对密度一致的条件下,数值试样的强度参数和变形参数随截断粒径的变化而单调变化;在细观层面上,颗粒体的各向异性演化规律与截断粒径密切相关.颗粒的配位数、接触失效率随截断粒径的减小而减小.截断粒径越小的试样含有的无效颗粒数越多,从数值试样的宏观强度、变形结果来考察数值剪切试验的精度,在本文数值试样的加载条件下,截断粒径取15mm时,其对宏观强度和变形的影响是可接受的.
The SGDD numerical model of random granularity considering granular disintegration is established to analyze the sensitivity of truncated particle size of rockfill body. The three triaxial tests with different confining pressure of different truncated particle size are carried out. The effect of truncated particle size on the mechanical properties of rockfill and its meso - mechanism were studied.The results show that under the condition of keeping the relative density consistent, the strength parameters and deformation parameters of the sample change monotonically with the change of truncated particle size. At the meso-level, the evolution of anisotropy of the particles is closely related to the size of the truncated particles.The coordination number of the particles and the contact failure rate decrease with the decrease of the truncated particle size.The samples with smaller truncated particle size contain The more the number of invalid particles, the numerical strength of the sample from the macro-strength, deformation results to examine the numerical shear test accuracy, the numerical sample loading conditions, the cut off particle size to take 15mm, its macro-strength and deformation Impact is acceptable.