【摘要】 在理论分析的基础上，通过对近一百个筛分结果的对比计算分析，发现砂的粒级筛上分布与破碎体分形近似一致；粒度指数或分形维数能综合反映砂的粗细和级配变化，克服了细度供数与级配区的不足，可作为粒级评估的单一指标；线性相关系数对细粒部分是敏感的．而且对粒级的离散性有反映．更多还原

【Abstract】 Based on the theorectical analysis,by analizing the calculated results of about 100 sieve analyses,it is found that the sand distribution of percentages retained of the sand are approximately in line with the fragment fractal;and that the granularity indix or fractul dimention can synthetically reflect variations of both partical fineness and grading, overcome their shortcomings,thus it can serve as the single index for grading evaluation.The linear correlation coefficient is sensitive to fine particles,and it can reflect the discreteness of grading.更多还原