摘要
粗粒料填土因其压实性好、透水性强、抗剪强度高而被广泛作为路基填料,其颗粒组成是影响可压实性的主要因素。以沪昆客运专线施工现场采集的数十组路基粗颗粒填土为研究对象,首先分析其是否满足分形特征,然后应用分形理论研究其质量分维数与可压实性之间的相关性。结果表明,当分形维数在一区间范围内时,粗粒土可压实性能良好,超过这一范围后,压实性能下降。可采用分形维数作为评价粗粒料填土级配的指标。
The coarse -grained soil, possessing the advantages of good compactibility, excellent permeability and high shear strength, is widely used as filling material for subgrade, and its particle composition is a main factor that influences the compact- ibility. We analyze whether the soil samples, collected at construction site of Shanghai - Kunming high - speed railway, possess fractal features, then the relativity between mass fractal dimension and compaction properties of the soil is studied by using fractal theory. The research show that good compactibility of the soil can be obtained if the fractal dimension falls in a certain range; but it drops down when the range is exceeded. Therefore, the fractal dimension can be chosen as an evaluation index to access the gradation of coarse - grained soil.
出处
《人民长江》
北大核心
2014年第1期91-93,101,共4页
Yangtze River
基金
铁道部科技研究开发计划(2010G018-B-3-21)
关键词
粗颗粒填料
颗粒组成
可压实性
分形维数
coarse - grained fillings
particle composition
compactibility
fractal dimension
