论文部分内容阅读
利用自行研制的煤岩固-气耦合细观力学试验装置,获得了含瓦斯煤体三轴压缩条件下煤样破坏过程中裂纹变化的实时图像,并利用matlab软件编程提取出细观试验图像中相关的裂纹参数;基于分形理论,研究了煤体裂纹的损伤演化特征.试验结果表明,随着应力、应变的增加,煤体裂纹数呈现出先增多后减少的变化规律,裂纹总长度和裂纹总面积均呈增大趋势;基于“小岛法”的相关原理对煤体表面裂纹演化的研究表明,煤体裂纹周长和裂纹面积的双对数具有良好的线性关系,煤体表面图像具有明显的分形特征,分形维数变化范围为1.25~1.48,且煤样表面分形维数与应变之间呈显著二次多项式函数关系.
The self-developed coal-rock solid-gas coupling meso-mechanics test device was used to obtain the real-time image of the crack change during the coal sample destruction under triaxial compression of coal gas and the matlab software was used to extract the mesoscopic experimental images Based on the fractal theory, the damage evolution characteristics of the coal body crack are studied.The experimental results show that with the increase of the stress and strain, the crack number of the coal body first increases and then decreases, the total crack length and crack total The results show that the double logarithm of crack circumference and crack area has a good linear relationship. The surface image of coal It has obvious fractal characteristics. The fractal dimension varies from 1.25 to 1.48, and the fractal dimension of coal sample shows significant quadratic polynomial function.