深孔扩壶爆破损伤演化过程的数值模拟

A NUMERICAL SIMULATION ON EVOLUTION PROCESS OF DAMAGE IN DEEP-HOLE CHAMBERING BLASTING

深孔扩壶爆破对于减少钻孔工作量，加大孔网参数，提高爆破效率均具有特别重要的意义。本文通过将岩石爆破分形损伤模型装入二维有限差分程序进行数值模拟，从岩石爆破损伤演化的角度对比一般深孔爆破与扩壶爆破的岩石破坏过程，发现扩壶爆破在应力作用时间和自由面效应等方面具有明显优势，从而为扩壶爆破技术的应用提供了设计依据。

It is of great importance of deep-hole Chambering Blasting to decreasing drill work load,increasing hole spacing and improving blasting efficiencyIn this paper,through numerical simulation with 2-dimension finite difference program for Rock Blasting Factal Damage Model,and comparing the difference damage evolution effects between deep-hole blasting and chambering blasting,it is found that the stress action time and its free surface effect are more advantageous in Chambering BlastingThe research result can be used as a foundation for designing the chambering parameters