基于图像测量的岩土破损信息的判读

Discrimination of damage and fracture information in rock and soil based on image measurement

以CT图像资料为例,利用物理特征值分析和裸眼观察法分别对岩土材料损伤出现的时间进行了估计,证明单纯观察判断的局限性,随后利用等值线法确定了损伤出现的位置和扩展的方向,接着通过对试样区CT数的最大、最小值随加载变化曲线进行考察,确定了无损区、损伤区和破裂区的分区界限值,在该阈值下对各区进行了图像的二值化,最后对二值图进行了形态、几何和物理特征值的定量化描述。

Based on CT images and utilizing analysis of physical characteristic value and naked eye observational estimate respectively,the time of damage appeared in the rock or soil is estimated so as to prove the limits of simple observation by eye. Then,using contour method determines the location of damage and judges its extending direction. Through analyzing curve of maximum and minimum of CT number and loading within specimen,the subarea thresholds of non-damage part,damage part and fracture part are determined. Moreover,binary images of each part are obtained under these thresholds. Finally,shape,geometry and physical characteristic value of these binary images are measured quantitatively.