季节冻土区路基土粒度成分的分形特征

以长春-四平一级公路、长春-松原一级公路及长春北某公路3处路基土样为研究对象，通过大量的室内试验数据，结合分形理论，讨论路基土粒度成分的分形结构，计算分形维数，并将分维数作为描述土粒度成分的指标，探讨其与土体冻胀的形式、冻胀量大小的关系。研究表明：分维数较大时易形成分凝冻胀，冻胀量较大；分维数较小时易形成原位冻胀，冻胀量较小。分维数与土的物理力学性质的回归关系表明，分维在一定程度上表征土的工程地质特征。

Fractal Structure of Granularity Composition of Soil in Roadbed in Seasonal Frost Regions

There were three groups soil as research objects,which came from Changchun-Siping A road,Changchun-Songyuan A road and some road in north of Changchun,many tests were done in lab and many datum were gotten.According to these tests and datum to fractal theory,discuss fractal structure of granularity composition of soil in roadbed,compute fractal dimensions and look on it as one index of soil granularity component,discuss relations between fractal dimensions and soil heave form,soil freeze capacity.Researches discover: soil is easy to form original heave when fractal dimensions are bigger,and its freeze capacity is smaller.Whereas,it easy to form segregate heave and freeze capacity is bigger.The regression relationship between fractal dimension and physical and mechanical property of soil indicates that fractal dimension characterizes the soil engineering geological features.