基于分形理论的非饱和土结构吸力定量计算

Quantitative Calculation on Structure Suction of Unsaturated Soil Based on Fractal Theory

已有的研究成果表明,非饱和土强度和变形特性在很大程度上是由结构吸力决定的。本文在可变结构吸力初步表达式的基础上,借鉴分形理论中的有关概念和方法,推导出不等粒径颗粒间可变结构吸力与土体含水量、干密度、孔隙比等的定量计算公式,并从理论上分析了可变结构吸力与含水量、干密度、孔隙比的关系。研究结果表明,可变结构吸力随着含水量的增大单调递减,随着干密度的增大单调递增,随着孔隙比的增大单调递减,与前人理论研究和试验研究结果一致。

Existing research shows that strength and deformation characteristics of unsaturated soil are largely determined by structure suction. Based on preliminary expressions of variable structure suction,by using concepts and methods of fractal theory for reference,derive quantitative formula derivation on variable structure suction with water content,dry density and void ratio of unsaturated soil with unequal particle diameters. The results show that the variable structure suction monotonically decreases with water content,increases with the dry density and void ratio,consistent with previous theoretical studies and experimental research results.