岩土颗粒三维形状表征参数对比分析

发布时间：2018-11-05 06:59

【摘要】：岩土混合介质中骨架颗粒的形状尺寸对介质力学性质具有不同影响,基于典型岩土颗粒(卵石、碎石)的三维激光扫描数据,通过球谐函数对颗粒的形状表征参数进行了统计分析,探讨了各统计量之间的影响变化.结果表明:对相同体积碎石和卵石而言,体积越小则卵石和碎石的表面积差距越小,所产生的力学性质影响区别越小;卵石的整体形状系数要普遍高于碎石;棱角度和球形度服从一定程度上的线性分布,并且球形度和棱角度呈反比关系;颗粒体积越大则颗粒表面的细节体现得越明显,表面的细节对相关力学性质有着重要影响,形状系数可以在一定程度上反映颗粒的磨圆程度.研究结果可为岩土颗粒在宏观性质中的相互力学作用分析提供借鉴.
[Abstract]:The shape and size of skeleton particles in geotechnical mixed medium have different effects on the mechanical properties of the medium. Based on the 3D laser scanning data of typical rock and soil particles (pebble and gravel), The shape characterization parameters of particles were statistically analyzed by spherical harmonic function, and the influence of each statistic was discussed. The results show that for the same volume of gravel and pebble, the smaller the volume, the smaller the difference between the surface area of gravel and gravel, the smaller the difference of mechanical properties, the higher the overall shape coefficient of pebble is. The angle of edge and the degree of sphericity are linear to some extent, and the degree of sphericity is inversely proportional to the degree of angle. The larger the particle volume, the more obvious the particle surface details are. The surface details have an important effect on the related mechanical properties, and the shape coefficient can reflect the particle grinding degree to a certain extent. The results can be used for reference in the analysis of the interaction of rock and soil particles in macroscopical properties.
【作者单位】：河海大学岩土力学与堤坝工程教育部重点实验室;河海大学岩土工程科学研究所;
【基金】：国家自然科学基金青年基金资助项目(51309089) 国家重点基础研究发展计划项目(2015CB057903) 江苏省自然科学基金资助项目(BK20130846)
【分类号】：TU43

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