精确延时对台阶爆破岩石破碎块度影响的数值模拟研究

Numerical Simulation of the Impact of Precise Time Delay on Rock Fragmentation in Bench Blasting

为了研究精确延时间隔对岩石破碎的影响,利用有限元软件就不同延时间隔条件对岩石破碎的影响进行了数值模拟研究。研究结果表明:合理设定延时间隔利于台阶顶部岩石破碎块度控制,同时能够改善岩石破碎块度分布情况。通过爆生气体和应力波关系的分析,计算得出的延时间隔和数值模拟结果较为接近;在本次数值模拟中,延时间隔6 ms、抵抗线3 m,即延时间隔和抵抗线关系为2 ms/m情况下有利于岩石破碎。

In order to study effects of the precise time delay interval on rock fragmentation, the finite element soft-ware was used to simulate the rock fragmentation under different time delay intervals. The results show that the reasonable delay time setting is advantageous to control the rock fragmentation on top, and can improve the fragmentation distribution of rock. Through the analysis of the relationship between stress wave and detonation gas, it is found that the results of delay interval time is close to those of numerical simulation. The delay time interval is 6 ms,and the resistance line is 3 m. And when the relationship between delay time interval and resistance is 2 ms/m, it is conducive to the rock fragmentation under this numerical simulation.