基于线性拟合的颗粒材料破碎状态表征

发布时间：2018-06-20 07:24

本文选题：颗粒破碎 + 级配　；参考：《岩土力学》2015年S1期

【摘要】：在荷载等因素作用下发生颗粒破碎是岩土材料的固有属性,选择合适的颗粒破碎状态表征指标是颗粒破碎问题研究中首先要解决的问题。基于颗粒破碎导致细颗粒含量增加,级配曲线抬升并趋向于分形的客观事实,提出了利用级配曲线的拟合直线的斜率和相关系数的变化规律描述颗粒破碎状态及其演化的新方法。在该基础上,提出了表征颗粒破碎状态的破碎分形指数及破碎分形相关性指数的概念,阐述了二者随颗粒破碎的发展规律。与试验结果对比表明,提出的状态指标与试验结果能够很好的吻合,颗粒破碎状态存在明确的对应关系,能够表征颗粒破碎难易程度及其发展趋势,为研究颗粒破碎问题提供了新思路。
[Abstract]:It is the inherent attribute of rock and soil material to produce particle breakage under the action of load and so on. The first problem to be solved in the study of particle breakage is to select appropriate characterization index of particle breakage state. Based on the objective fact that particle fragmentation leads to an increase in fine particle content, the gradation curve rises and tends to fractal, A new method for describing particle breakage and its evolution by using the slope and correlation coefficient of the fitting line of the gradation curve is proposed. On this basis, the concepts of fractal index of fragmentation and fractal correlation index of fracturing are put forward, and the law of their development with the breaking of particles is expounded. The comparison with the experimental results shows that the proposed state index is in good agreement with the test results, and there is a clear corresponding relationship between the particle breakage state and the test results, which can be used to characterize the degree of difficulty and the development trend of particle breakage. It provides a new idea for the study of particle breakage.
【作者单位】：中南大学土木工程学院;高速铁路建造技术国家工程实验室;湖南省高速公路建设开发总公司;
【基金】：国家重点基础研究发展计划(973)项目(No.2014CB047001) 自然科学基金专项基金项目(No.41340012)
【分类号】：TU43

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