钙质结核土分形特性及表观特征研究

The Fractal Characteristics and Apparent Characteristics of Cohesive Soil Containing Calcareous Nodules

钙质结核土是由含有细粒的粘性土和粗颗粒的钙质结核组成的典型二相粒度土,钙质结核土的粒径分布规律目前尚无全面的系统的研究。以江苏宿迁地区钙质结合土为研究对象,进行了颗粒分析试验,基于分形理论,研究了钙质结核土粒径分布和粒径分形特性,对其分布规律进行了深入分析,并且对钙质结核的表观特征进行了细观研究。通过三维扫描技术,得到结核球形度与粒径具有一定的负相关性,球形度能够较好的评价结核的磨圆特征,其与结核粒径之间的关系可用于随机重构颗粒的细观特征研究。

Cohesive soil containing calcareous nodules is a typical two-phase granular soil composed of fine-grained cohesive soil and coarse granular calcareous nodules.The particle size distribution of cohesive soil containing calcareous nodules has not been comprehensively studied.Soil samples from Suqian in Jiangsu province were taken as the research object.Based on the grain-size analysis test,the particle size distribution and fractal characteristics of cohesive soil containing calcareous nodules was studied using the fractal theory.Then the apparent characteristics was analyzed.Concluded through the 3D scanning technique,there is a negative correlation between sphericity and particle size of the nodules,the sphericity can evaluate the grinding characteristic of the nodules well,the relationship between sphericity and particle size can be used to study the mesoscopic characteristic of randomly reconstructed particles.