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| 掘进巷道爆破粉尘运移规律数值仿真 |
| Numerical Simulation of Blasting Dust Transportation Laws in Roadway Excavation |
| 投稿时间：2023-09-22 修订日期：2023-11-05 |
| DOI： |
| 中文关键词: 粉尘；数值仿真；通风距离；通风风量；产尘量 |
| 英文关键词: Dust; Numerical simulation; Ventilation distance; Ventilation airflow; Dust production |
| 基金项目:湖南科技大学大学生创新创业训练计划项目 |
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| 中文摘要: |
| 为了研究掘进巷道爆破粉尘运移规律，依托瓮福磷矿延伸开采技术改造项目为背景建立巷道爆破压入式通风模型，运用数值仿真的研究方法，分析压入式通风风流特性与粉尘运移规律。研究结果表明：风流从出风口射向工作面的过程中，风流速度不断减小，风流到达工作面时会发生回流现象。爆破后粉尘随风流向巷道出口方向移动，回风侧的粉尘浓度大于风筒侧，爆破后400 s，巷道内的粉尘基本全部排出。随着通风管距工作面距离增加，掘进工作面的粉尘浓度增加；随着通风风量的增加，工作面处粉尘浓度逐渐下降；工作面产尘量越少，粉尘浓度下降至2 mg·m-3所需时间越短。瓮福磷矿最佳通风参数应为通风管距离工作面8 m，通风管风量848 m3·min-1，该参数有利于巷道爆破控尘。 |
| 英文摘要: |
| In order to study the blasting dust transportation law of the tunnel, we establish the tunnel blasting pressure-entry ventilation model based on the background of the extended mining technology transformation project of urnfu phosphorus mine, and analyze the characteristics of the pressure-entry ventilation wind flow and dust transportation law by using the numerical simulation research method. The results show that: the wind flow from the outlet to the working face of the process, the wind flow velocity decreases, the wind flow to the working face will occur when the phenomenon of reflux. After blasting, the dust moves with the wind flow to the exit direction of the roadway, and the dust concentration on the return side is larger than that on the wind pipe side, and the dust in the roadway is basically discharged in 400s after blasting. With the increase of the distance of the ventilation pipe from the working face, the dust concentration in the working face increases; with the increase of the ventilation air volume, the dust concentration at the working face gradually decreases; the smaller the amount of dust produced in the working face, the shorter the time required for the dust concentration to fall to 2 mg·m-3. The best ventilation parameters for the urnfu phosphate mine should be ventilation pipe distance from the working face of 8 m, ventilation pipe air volume of 848 m3/min, this parameter is conducive to the roadway blasting dust control. |
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