The Experimental Research On The Damage Evolution Of Uranium Ore-bearing Rock And Radon Exhalation Rule Under Cyclic Blast Loading

At this stage,the mechanical ventilation of the mines is the main measure to reduce the concentration of radon and its daughters which is produced in uranium mine shaft.However,when designed the ventilation system,the first thing for consideration is the amount of radon that is ejected into the shaft by the emanation medium and also affected by the migration.A numerous studies have shown that the migration behavior of radon in emanated media is a time-dependent process related to internal and external factors such as temperature,pressure,water content,porosity,and permeability.Scholars at home and abroad have conducted detailed studies on the factors affecting radon transport,yet the analysis of the damage evolution and radon uranium ore-bearing under cyclic blasting loads has rarely been reported.The experimental data is obtained by designing independently the comprehensive test system to research damage evolution of uranium ore-bearing and radon exhalation rule.The relation between cumulative uranium ore damage revolution and radon exhalation rate is provided a theoretical foundation for the control of radon radiation in underground uranium mining.The specific research contents are as follows:(1)Choosing the experimental tools and ensuring the designing plan of similar model apparatus,cyclic blasting load apparatus,and cumulative damage degree and radon gas collection apparatus according to the experimental requirement to make full use of software Solid Works to design 3D whole simulation.(2)Determining the proportional rate of similar materials based on granitic uranium ore according to the similar simulation theory,similar principle of physics,mechanics and radioactive parameters and orthogonal experimental procedure.The study is made by the experiment to make test cube of uranium ore-bearing to replace the required engineering rocks.(3)Researching the blasting damage characteristics of rock under cyclic blasting loads by applying the cyclic blasting loads and acoustic wave measures,ZBL-U5 series non-metallic ultrasonic detector.The rock blasting damage parameters are defined by the change of acoustic speed to study further the evolution.(4)Obtaining the data of cumulative radon concentration by using the closed chamber method,the regular measured way,like RAD7.The data is processed to get the radon exhalation rate of the uranium ore-bearing rocks and its rule under the cyclic blasting load before and afterwards(5)Ensuring the cumulative damage degree based on the K-means Clustering Analysis applying the data processing.The relation between cumulative damage evolution of uranium ore-bearing under cyclic blasting loads and radon exhalation rate is studied above the rules.