梅山铁矿采场爆破粉尘运移规律数值模拟研究

Numerical Simulation of Blasting Dust Migration in Meishan Iron Mine

为探究巷道型采场爆破粉尘排出采场的运移规律,以梅山铁矿-330m水平某巷道型采场为基础,采用数值模拟方法研究爆破粉尘在采场中的运移规律。研究结果表明:采场风速在竖直断面上的分布呈现"两侧高、中间低、进风大于出风,迎头附近几乎无风"的规律。爆破后600s内,粉尘浓度迅速下降。爆破粉尘在水平方向上的扩散明显受风流场影响,采场上部的粉尘扩散速度大于下部的粉尘,下部风流不畅,采场底部的粉尘浓度长时间高于上部粉尘浓度,有时会出现靠近迎头的一隅直至排尘结束仍存在小团粉尘无法排出的情况。由此提出联通巷风速为2m/s、3m/s时最有利于爆破粉尘的排出,增加附壁风筒可避免粉尘在迎头处沉积。

In order to explore the migration law of blasting dust discharged from the roadway stope,based on a roadway stope at-330 mlevel in Meishan Iron mine,numerical simulation was carried out.The results show that the distribution of wind speed in vertical section of stope is high on both sides and low in the middle,the inlet wind speed is greater than the outlet wind speed,and there is almost no wind near the head.Within 600 seconds after blasting,the dust concentration decreases rapidly.The diffusion of blasting dust in horizontal direction is obviously affected by the wind flow field.The dust diffusion speed at the upper stope is higher than that of the lower stope,and the air flow at the lower stope is not smooth.The dust concentration at the bottom of the stope is larger than that at the upper stope for a long time,so sometimes there is still a small cloud of dust can not be discharged in a corner near the head until the dust discharge is finished.Thus,it is suggested that the wind speeds of2 m/s and 3 m/s in connected roadway are the most favorable for blasting dust discharge,and the dust deposition in the head can be avoided by adding the wall attached air tube.