基于SEM图像的软土接触面积定量研究

Soft Clay Contact Area Quantitative Research Based on SEM Images

为了获取软土接触面积大小,对杭州紫金港软土进行了大量的SEM图像扫描,通过分析软土SEM图像的特点,建立三维空间计算模型,利用Image-ProPlus(IPP)软件统计软土的微观孔隙率,通过对比宏观孔隙率与微观孔隙率之间的关系,定量获取土体接触面积的百分比,首次提出了软土平均接触面积率的概念,分析了孔隙率获取中可能存在的误差.结果表明,土体接触面积并非很小,其值跟孔隙率有关,孔隙率越小接触面积率越大,本文试样中,当软土孔隙率为0.371时,接触面积率约10%,且采用宏微观孔隙率相等获取的接触面积率比采用阈值获取的要稳定,该方法提供了一条获取软土接触面积率的有效路径.

In order to get the size of soft clay contact area,a larger number of SEM images for soft clay in Zijingang Hangzhou had been scanned. Three-dimensional calculation model was built by analyzing the characteristics of these SEM images. Soft clay micro porosity was counted with the use of Image-Pro Plus( IPP) software. By comparing the relationship between macro-porosity and micro-porosity,the percentage of soft clay contact area had been obtained. The concept of soft clay average contact area rate was first proposed,and the deviation that may be present had been also studied. The results show,the soft clay contact area is not very small and its value is related with the porosity. The smaller the porosity is,the greater the contact area rate is. The sample shows that when the porosity value is 0. 371,the contact area value is about 10%.Comparing to the contact area rate obtained from average threshold value,the results obtained form the same porosity is more stable. The method provides an effective method to measure the soft clay contact area.