岩石爆破作用的分形研究

应用分形理论，研究了岩石（体）性质对爆炸应力波传播的影响，分析了正交异性岩石（体）内的爆破作用及破裂效果。将岩石（体）内的缺陷（空隙）作为一种损伤，由其分形维数推导出空隙率与爆炸应力波峰值随距离衰减的关系，空隙率作为岩石（体）的一个重要参数，直接影响岩石（体）的力学和变形性质，将这一参数引入爆炸应力波峰值随距离的衰减，较好地体现了岩石（体）力学和变形性质在爆破载荷中的作用。本文还对正交异性岩石（体）两个方向的爆炸应力波衰减进行了比较，给出两个特征方向炮孔合理间距的定量关系，为工程爆破参数设计提供了依据

Fractal Study on Blasting Effect in Rock

The effects of rock characteristics on the propagation of explosion stress wave are studied and the blast action and the crack effects in the orthotropic rock are analysed through fractal principle. The gaps in rock are considered as a kind of damage and the relationship between the porosity of rock and attenuation index of stress wave with distances is deduced from the fractal dimensions. As an important parameter, the porosity directly affects the deformation and mechanical characteristics of rock. This parameter, introduced into the attenuation index of explosion stress wave with distances, embodies the role of rock characteristics in the blast load. This coincides with the experience and experiment results. The paper compares the attenuation indexes in two perpendicular directions in the orthotropic rock . The quantitative relationship between spacing of blast holes in two perpendicular directions are given, which provides the theoretical basis for blast engineering design.