Distribution Of Radon Concentration With Ventilation In Blind Roadway

With the continuous progress of industrialization in China,the demand for energy and mineral resources is increasing day by day.As the producers of energy and mineral resources,Mine workers are generally exposed to radiation damage to the body by radon in the mine.Due to some reasons such as inconvenient ventilation and broken rock mass,radon pollution in blind roadway is more serious than other areas in the mine.In order to effectively control the radon pollution in the mine,correctly guide the production ventilation,improve the working environment and ensure the health of the underground workers,the radon concentration and distribution of blind roadway under the condition of ventilation are studied in this paper.The main contents are as follows:The basic theory of ventilation in tunnel is introduced,and the numerical simulation of the ventilation experiment in a blind roadway is made by using FLUENT.Compared to the measurement results,the accuracy of the model and calculation method are validated.This simulation experiment provides method support for later research.The unidimensional blind roadway ventilation models under different ventilation modes are built,and the distribution law of radon in forced ventilation and forced-exhaust ventilation are derived.The formula of radon concentration distribution in blind roadway under different ventilation modes is obtained.To study the ventilation process of blind roadway under different ventilation modes,the blind roadway ventilation models under three ventilation modes are built,and the concentration and distribution of radon under three ventilation modes are known.The reasonableness of the theoretical formula is studied.By comparing with the concentration of radon under three ventilation modes,It provides guidance for the selection of ventilation mode in actual production.Finally,Based on the four factors which are the height of the air vent,exhalation rate of enclosure structure,source concentration and ventilation volume,the influences of various factors on ventilation in blind roadway is studied by buliding the corresponding models.The influence of various factors separate changing on the radon concentration in blind roadway is known.It provides guidance for the ventilation and ventilation in the roadway.