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基于体视学原理,运用工业CT试验系统对煤样进行单轴加载扫描试验。对得到的CT扫描图像采用不同阈值求取其裂隙张量特征值平方和的曲线,选取曲线图拐点处所对应的阈值作为图像二值化的阈值,并验证该阈值是计算二阶张量的最佳阈值。同时实现体视学中对二值化后的图像测线及特征区域参数的提取,提出特征值平方和的概念作为描述煤样破损程度的参数。在从三维角度重构出的裂隙煤样中,选取3个正交面构造出二阶张量特征值平方和与孔隙率之间的关系,为进一步从三维角度描述煤样裂隙损伤奠定基础。
Based on the principle of stereology, the uniaxial loading scanning test of coal samples was carried out by using industrial CT test system. The curve of the squared eigenvalue of the fracture tensor is obtained by using different thresholds for the obtained CT scan image. The threshold value corresponding to the inflection point of the graph is selected as the threshold value of the image binarization, and the threshold value is calculated to be the value of the second order tensor Good threshold. At the same time, it realizes the binarization of the image line and the extraction of characteristic region parameters in stereology, and proposes the concept of square sum of eigenvalues as the parameter to describe the degree of damage of coal samples. In three-dimensional reconstructed fissured coal samples, three orthogonal surfaces were chosen to construct the relationship between the square sum of the second-order tensor eigenvalues and the porosity, which laid the foundation for further describing the fissure damage of coal samples in three dimensions.