| With the rapid development of nuclear power and the increasing demand for uranium resources,China has accelerated the exploitation of uranium mines in recent years.In the deep mining of uranium mine,the ground temperature and pressure will increase,which will lead to the occurrence of secondary cracks and ultrasonic acoustic emission accompanied.There are few studies on the phenomenon of radon abnormality and its regularity before rock bursting due to the change of stress in the process at home and abroad.According to the above research,and based on the study of radon monitoring and the regularity of rock radon exhalation with ultrasonic acoustic emission,at the same time,it was combined with the project of National Natural Science Foundation of China “three poor coupling mechanism of deep uranium well radon exhalation and line of radon airflow calculation mode research”.In this paper,an experimental device for the measurement of radon in aqueous porous media under ultrasonic effect was designed.The effect of ultrasonic and moisture content on the radon exhalation were studied.It will provide theoretical basis for the design of radon pollution control in uranium mining under different hydro-geological conditions in China.The main contents in this research are as follows:(1)According to the similarity criterion,the uranium ore was abstracted as a porous emanium media,the experimental device of radon deposition of porous emanium media under ultrasonic irradiation was designed,and the radium content and moisture content of porous emanium media were analyzed.(2)Based on the experiment results,the radon exhalation rate of the specimens were calculated and the influence of ultrasonic effect on the radon exhalation of the porous emanium media was analyzed.It was found that the radon exhalation rate of porous emanium media under ultrasonic effect will be increased with the increase of the ultrasonic power,and there was linear positive correlation between them.(3)According to the calculation results,the influence of moisture content on the radon exhalation of porous emanium media was analyzed,it was found that the radon exhalation rate of porous emanium media increased firstly and then decreased with the increase of moisture content.(4)There were significant differences of radon exhalation rate with different moisture contents under ultrasonic effect.The increase rate of the radon exhalation rate of saturated water specimen under the 600 W ultrasonic effect was 84.05%,and followed by 57.78% and 43.83% of air-dried specimen and completely dry specimen,respectively. |
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