(1. School of Resources and Environment and Safety Engineering，University of South China，Hengyang，Hunan 421001，China；2. Hunan Province Engineering Research Center of Radioactive Control Technology in Uranium Mining and Metallurgy，University of South China，Hengyang，Hunan 421001，China；3. Hunan Province Engineering Technology Research Center of Uranium Tailings Treatment Technology，University of South China，Hengyang，Hunan 421001，China；4. College of Energy Science and Engineering，Xi'an University of Science and Technology，Xi'an，Shaanxi 710054，China)
Abstract：On the basis of reviewing the existing research status of cumulative damage of rock mass and summarizing the existing engineering application fields of radon，this paper attempts to apply the detection technology of radon to the research field of rock damage mechanics，so as to monitor the evolution process of cumulative damage of rock mass. Based on the above research purpose，a test device for surface radon detection of radioactive rock cumulative damage is designed，and the system is integrated to implement the test scheme. The test results show that radon detection technology can effectively identify the damage trend of loaded rock mass. K-means clustering algorithm is adopted，and the comprehensive damage degree is defined，and it is found that the cumulative damage evolution curve of rock mass blasting has three obvious stages and shows the shape of "inverted S". Based on the measured data of radon exhalation rate on the surface，it is proved that there is a certain linear relationship between radon exhalation rate and cumulative damage in rock mass，and the feasibility of using radon to detect cumulative damage is further verified. The results show that the cumulative damage of the loaded radioactive rock test blocks can be reflected by the surface radon detection technology，and finally the correlation between the cumulative damage characteristics and the continuous change of radon exhalation rate is obtained. The radon exhalation rate prediction index K is used as a new definition of damage degree，and the subsequent multi-angle accurate prediction of dynamic disasters provides a theoretical basis.
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2020, Vol. 39 
