分形理论在研究非饱和土力学性质中的应用.pdfVIP

第28卷 第5期 岩 土 工 程 学 报 2006年 月 5 分形理论在研究非饱和土力学性质中的应用* 1 1 2 徐永福 黄寅春 (1.上海交通大学船舶海洋与建筑工程学院 上海 2000302.江苏省常州市交通局 江苏 常州 213000) 摘 要 试验室内确定非饱和土的力学性质有许多困难 土体结构与其力学性质密切相关 土体结构可以用分形模型 描述 分形理论能很好地用来估算非饱和土的力学参数 文中由非饱和土孔隙分布的分形模型导出了非饱和土的水分 特征曲线 渗透系数 剪切强度的表达式 并与已经有的经验公式和试验数据进行了比较 验证了本文的理论结果 关键词 分形 分维 非饱和土 水分特征曲线 渗透系数 强度 中图分类号 TU432 文献标识码 A 文章编号 1000 –4548(2006)05 –0635 –04 作者简介 徐永福(1967 – ) 男 江苏人 博士 教授 博士生导师 主要从事非饱和土土力学 环境土工学 地下 工程施工力学与监测研究 Fractal-textured soils and their unsaturated mechanical properties 1 1,2 XU Yong-fu , HUANG Yin-chuan (1. School of Naval, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200030, China; 2. Changzhou Communication Bureau, Jiangsu Province, Changzhou 213000, China) Abstract: The mechanical properties of unsaturated soils were a function of the degree of saturation or matric suction, and could be obtained based on currently available procedures. However, each procedure had its limitations and consequently cares should be taken in the selection of a proper procedure. Fractal approach seemed to be a potentially useful tool to describe hierarchical systems and was suitable to model the structure and hydraulic properties of unsaturated soils. The soil-water characteristics, unsaturated hydraulic conductivity function and unsaturated shear strength were derived from the fractal model for the pore-size distribution, and were expressed by only two independently physical parameters, the fractal dimension and air-entry val