软土地基变形的混沌性研究

Chaotic Identification Research on Soft Soil Foundation Deformation

目的为提高软土地基的承载能力,促进软土地基理论和技术在工程中的应用.方法以混沌理论为基础,对天然软土地基、碎石桩复合地基、半刚性碎石桩复合地基Lyapunov指数进行计算,结果表明三项地基的Lyapunov指数均大于0,证明了软土地基变形具有混沌性.结果通过软土地基加固前后的Lyapunov指数和变形不动点的比较,半刚性碎石桩复合地基的Lyapunov指数小于天然地基的Lyapunov指数,天然地基没有变形不动点,而半刚性碎石桩复合地基存在变形不动点,证明采用半刚性碎石桩复合地基,软土地基的混沌性得到了明显的控制,是控制软土地基变形混沌性的有效手段.结论根据映射函数的不动点,对软土地基加固前后的承载力进行了识别,采用半刚性碎石桩加固软土地基,承载力不动点增大,取得了较好的加固效果.

In order to improve the bearing capacity of the soft foundation and put the theory and technology of soft foundation into practice, chaotic characterization of soft soil foundation is analyzed, on the basis of chaotic theory, after Lyapunov indexes of natural soft soil, stone columns, semi-rigid stone columns are calculated, and their Lyapunov indexes are more than 0. Lyapunov index in semi-rigid stone columns is less than that in natural soft soil stone, and the not-moving point of deformation is not existing in natural soft soil stone, but it is existing in Semi-rigid stone columns. Setting up semi-rigid stone columns is an effective means of controlling soft soil chaotic characterization, by comparing Lyapunov index and deformation notmoving point of three kinds of foundations. According to the non-moving point of mapping function, soft soil foundation capacity can be identified, and the solution shows that foundation capacity increases, and it has achieved a good result for semi-rigid stone columns to improve soft soil foundation.