水泥加固土微观结构的分形

为了明确有机质对水泥加固土强度形成所产生的影响,采用水泥对不同有机质含量的软土进行加固,通过无侧限抗压试验测定达到养护期的水泥加固土的力学指标,对有机质含量与水泥土强度的关系进行分析,利用扫描电子显微镜采集不同试样的微观结构照片,并采用WD-5图像处理系统对土样的微观结构图像进行定量分析,提取各试样中土颗粒形态的分维数值,用颗粒分布的计盒维数来表征各试样的分形特征.结果表明:有机质含量越高,颗粒分布的分维数值越大,试样的团粒化程度越低,水泥加固土的强度越差.土中有机质对水泥加固软土的效果具有一定的影响,颗粒分布分形的计盒维数与水泥加固土的强度呈负相关性.

Fractal study on microstructure of cement consolidated soil

In order to clarify the influence of organic matter on the strength of cement stabilized soil,soft soil with different organic contents was consolidated with cement,and the mechanical index of cement stabilized soil was determined by means of unconfined compression test,then the relationship between organic matter and cement-soil strength was analyzed.Microstructure pictures were obtained through scanning electron microscope,and quantitative analysis of microstructure photos was done by WD-5 picture processing system from which the fractal dimension of soil grains shape was picked.Here box counting dimension was used to illustrate the fractal characters of samples.Results show that: higher organic content in soil makes the larger fractal dimension of grains distribution,the lower granulation degree and the worse strength of cement stabilized soil.Organic matter does influence the stabilizing effect of cement,and there is a negative correlation between the box counting dimension of grain distribution and the strength of cement —soil.