结构性软土微观结构定量化参数的研究

目的揭示营口地区3层典型软土在固结流变过程中的微观结构变化规律.方法利用SEM图片和计算机图像处理技术,提取代表软土流变特征的微观参数,分析对比这些微观参数在固结流变过程中的变化规律.结果代表软土微观结构单元体定向性参数的变化与软土宏观蠕变变形具有良好的相关性,其中以结构单元体的概率熵和分维值的变化规律性最强.结论概率熵和分维值是研究软土的流变变形问题中两个重要的微结构参数.微结构参数与宏观流变变形有内在联系.

The Quantitative Analysis of Microstructure Parameter of Soft Soil

In order to analyze the consolidation creep law of soft soil,the Scanning Electronic Micro-scope(SEM) and Video-lab Image Processing System were employed to observe the changing conditions of microstructure of soft soils distributed in Yingkou area,Liaoning Province of China.The microstructure parameters which can be used to explain the law of creep deformation are determined,and the results show that there are numerous micro-structure parameters which will alter with change of the creep stress.Among them the parameters which show the ordering extent of microstructure units have close relation with the development of compressive creep,such as the probability entropy(H_m)and fractal dimension value(D_d).So both probability entropy and fractal dimension value can be used to study the problems of creep of soft soils.