珠江三角洲软土地基变形的混沌特性研究

混沌是非线性系统较普遍存在的一种现象，本文以混沌理论为基础，对珠江三角洲软土地基的变形特性进行了研究。从软土的工程特性和微观结构出发，分析了软土地基变形混沌性的根本原因，并对软土变形混沌性进行了定性判别和基于Lyapunov指数的定量判别。研究结果表明，珠江三角洲地区的天然地基及处理后的复合地基的最大Lyapunov指数 均大于0，软土地基的变形具有明显的混沌性。混沌理论为软基变形研究提供了一种新的途径，在工程领域具有广阔的应用前景。

Study on chaotic characteristics of soft soil foundation deformation in Pearl River Delta

Chaos is a kind of universal phenomenon of nonlinear system. On the basis of chaotic theory, chaotic characteristics of soft soil foundation deformation of the Pearl River Delta are discussed. Based on engineering characteristics and microstructure of soft soil, radical reasons of chaotic characteristics of soft soil deformation are analyzed; the qualitative analysis and quantitative analysis according to Lyapunov exponents of chaotic characteristic of soft soil deformation are discussed as well. The research results show that all of the maximal Lyapunov exponent ( ) of natural soft soil foundation and all kinds of composite foundation in Pearl River Delta are more than 0; therefore the deformation of soft soil foundation is chaotic. The chaotic theory offers a new effective way for study of soft soil and has broad application foreground in engineering fields.