通风管道长度变化对铀矿井下氡浓度影响的模拟研究

为降低铀矿开采过程中氡及氡子体内照射对井下工作人员的辐射危害，有效提高防护水平，需掌握氡在铀矿山井下介质中传输规律以及影响氡浓度迁移分布的因素，并在此基础上通过软件模拟预测某项工程措施实施后能否起到良好的降氡效果。本研究根据设计图纸以及现场测绘情况，利用ANSYS Workbench15.0软件建立矿井中段模型，采用非结构化网格对模型进行划分，并对通风管道壁面区域加密处理。在网格质量满足计算要求后，完成了井下风场整体模拟及空气流动性较差位置筛选等前期工作，在此基础上提出改变通风管道长度的措施，并对变化后的新模型进行氡初始浓度、氡析出率、风速、风压、温度、湿度、壁面光滑程度等参数设置，经运算得出井下氡浓度模拟结果。结果表明，井下通风管道长度变化后，31个关注点中有29个点位氡浓度降低，仅2个点位氡浓度升高，整体降氡效果良好，可为后续工程实施提供理论参考。

Simulation Study on the Effect of Length Variation of Ventilation Pipeline on Deuterium Concentration in Uranium Mine

In order to reduce the radiation hazards of radon and radon in the uranium mining process to underground workers and improve the protection level effectively, it is necessary to master the transmission law of radon in the underground medium of uranium mine and the factors affecting the migration distribution of radon concentration, and on this basis, it predicts the implementation of a project by software simulation. The effect of radon reduction can be achieved. According to the design drawings and the situation of field mapping, the model of the middle section of the mine is established by ANSYS Workbench 15.0 software, and the model is divided by unstructured grid, and the wall area of the ventilation pipe is encrypted. After the grid quality meets the calculation requirements, the overall simulation of the downhole wind field and the screening of the poor air flow position are completed first. On the basis of this, some measures are put forward to change the length of the ventilation pipe, and the radon initial concentration, radon exhalation rate, wind speed, wind and wind are carried out. Parameters such as pressure, temperature, humidity and smoothness of the wall are set up. Finally, the simulation results of radon concentration in underground are obtained. The comparison shows that after the change of the length of the underground ventilation pipe, 29 points radon concentration in the 31 points of concern are reduced, only 2 points radon concentration increase and the overall radon reduction effect is good, which can provide theoretical basis for the real implementation of the follow-up project.