铀煤叠置矿区对煤矿开采环境氡影响的探讨

在我国内蒙地区赋存了大量铀煤共生矿床,形成铀煤叠置区。在先铀后煤采冶过程中,铀矿含水层残留放射性核素衰变产生的氡会随着地下水及矿区地下孔隙发生渗流、扩散进入煤矿开采工作面。为分析这一现象的辐射影响,运用CFD数值模拟技术,对气液两相氡渗流、扩散所致煤矿工作面的辐射影响进行了模拟。结果表明:随着煤矿床的掘进,导致工作面附加氡活度浓度在263.22～645.54 Bq/m³之间,需采取加强通风、封堵等措施降低氡浓度对煤矿开采作业人员的附加影响。

Discussion on the influence of uranium-coal superimposed mining area on coal mine environment radon

A large number of uranium-coal symbiosis deposits had occurred in the Inner-Mongolian area in China,and the uranium-coal superimposed areas were formed.In the process of uranium and coal mining and smelting,the radon produced by the decay of residual radionuclides in the uranium aquifer will seep and diffuse into the coal mining surface along with groundwater and underground pores in the mining area.In order to understand the radiation effect of radon on coal mining working surface,this phenomenon needs to be studied and analyzed.The CFD numerical simulation technology was used to simulate the radiation influence of the coal mining surface caused by the gas-liquid two-phase radon seepage and diffusion.The results show that the concentration of additional radon is between 263.22-645.54 Bq/m³ with the advance of coal mining.Measures such as strengthening ventilation and blocking measures should be taken to reduce the additional impact of radon concentration on coal mining operators.