通过对某坑道出口工程的爆破相似率、动力相似条件及工程岩体爆破破坏机理分析,介绍了爆破模型试验的主要相似参数及动力相似问题。重点讨论了现场爆破模型试验中抛掷距离的相似关系,在抛体堆积法的基础上,得出了抛掷距离与几何相似比近似成4/3次幂关系,在现场爆破模型试验中,抛掷距离直接按几何相似比进行设计满足工程需要。 By analyzing the blasting similarity, dynamic similarity conditions and blasting failure mechanism of a tunnel exit engineering, the main similarity parameters and dynamic similarity of blasting model test are introduced. The similarity relation of throwing distance in blasting model test was discussed. Based on the throwing accumulation method, the throwing distance and geometric similarity ratio were approximately 4/3 power relation. In the field blasting model test, the throwing distance Directly according to the geometric similarity ratio to meet the engineering needs.