【摘要】 本文在考虑了岩石断裂面的分形特征之后，提出了新的爆破决度尺寸ｄ＿ｉ的计算方法，对ＢＭＭＣ模型作了修正。计算表明：修正后的模型克服了原模型倾向大决湍的缺点，与实际符合得更好。更多还原

【Abstract】 By taking the fracture feature of rock surface into consideration,the authors present a new method to calculate the blasting fragment size d_i and a modified model of BMMC.The calculation results have shown that the modified model enjoys a better agreement with the practice.更多还原