煤体爆破破碎分维评价方法的研究

 提出了煤体爆破破碎分维评价方法和分维比概念, 考虑了煤体原始结构特征对煤体爆破破碎效果的影响。通过主因素分析, 明确了爆破参数与分形维数、分维比的相关关系以及影响的显著性大小, 探讨了不同分维和分维比的表征含义。在单自由面深孔煤体爆破的条件下, 爆破块度相似分维与分维比体现了顶煤预爆破破裂裂隙的整体分布, 可作为定量评价爆破方案的主要指标, 表面裂隙分维测量计算简易, 是煤体内部裂隙的外在表现, 可作为初步评价爆破方案的定量指标。应用煤体爆破破碎分维评价方法对大同矿务局忻州窑矿坚硬顶煤进行了预爆破研究, 取得了很好的经济效益。

STUDY ON FRACTAL DIMENSION EVALUATION MEASUREMENT OF COAL ROCK BLASTING

Blasting accomplishes the supplemental fragmentation of the natural coal rock with such discontinuity as joints, cracks, etc.. The effect of the original tectonic character on blasting result is taken into account. The concept of fractal dimension ratio and fractal dimension evaluation measurement of coal rock blasting is presented. The principal component analysis is introduced to identify the relationship among parameters, fractal dimension and fractal dimension ratio. In the case of one free surface, similar fractal dimension and its ratio of the fragmentation of coal rock blasting embody the whole distribution of the blasting cracks, while similar fractal dimension and its ratio of the surface of coal rock blasting represent the exterior cracks distribution. The proposed method is proved to get great economical benefit in the application in Datong Mining Bureau.