Development of numerical simulation program for blasting in heterogeneous and inhomogeneous rocks

为了模拟非均质和非均质材料中的动应力和波的传播，开发了一个基于有限差分近似运动方程的数值模拟程序。本规范考虑了强应力波作用下材料的破坏。因此，利用该程序可以对非均质和非均质岩石的爆破破坏和爆破振动进行数值模拟。该程序用Fortran语言编写，可在便携式微机上运行，并在微机上进行了单自由面爆破的应力分布和岩石破坏模式的计算。利用所编制的图形程序，显示了强应力波引起的应力时程和岩石破裂模式。计算结果与实际爆破观测结果吻合较好。

In order to simulate dynamic stresses and wave propagation in heterogeneous and inhomogeneous materials, a numerical simulation code based on the finite difference approximation to the equation of motion was developed. In this code, breakage of materials by strong stress waves is taken into account. Therefore, by using this code, numerical simulation of rock breakage by blasting and blast vibration in heterogeneous and inhomogeneous rocks can be made. This code was written by Fortran and can run in a personal portable computer.Computation of stress distribution and pattern of rock breakage by blasting with one free face for various conditions were performed by using this code and a personal computer. The time histories of stresses caused by strong stress waves and pattern of rock breakage are shown by using graphic programs those were developed in this study. The results obtained coincided well with the ones expected from the results observed at actual blasting.