Abstract
This paper summarized the separation process of radon based on its geophysical-chemical properties. Taking into account the geological conditions of mining, the mathematical model of radon migration in underground multilayer strata (UMS) was established to investigate the distribution law of radon concentration in UMS. It was found that the distribution of radon concentration in UMS is affected by both the properties of the strata and the depth of cover and the radon concentration law varies at different depths even in the same layer stratum. At last, in order to validate the derivation result of the mathematical model of radon migration in UMS, the actual measured values (AMV) and the calculated values (CV) were compared further. As a result, the CV was found to be approximately equal to the AMV with deviation values (DV) less than 5%, which indicates that the derivation result of the mathematical model of radon migration in UMS is correct.
Highlights
As a main energy resource in China, coal accounts for about 77% and 65% in primary energy production and consumption [1, 2], which plays an important role in nation’s economic development
The calculated values (CV) was found to be approximately equal to the actual measured values (AMV) with deviation values (DV) less than 5%, which indicates that the derivation result of the mathematical model of radon migration in underground multilayer strata (UMS) is correct
To validate the derivation result of the aforementioned mathematical model of radon migration in UMS, three-layer strata were selected to detect the radon concentration by KJD-2000R continuous emanometer at different depths
Summary
As a main energy resource in China, coal accounts for about 77% and 65% in primary energy production and consumption [1, 2], which plays an important role in nation’s economic development. The effects and reliabilities are easy to be influenced by the underground geological conditions, by which it will be difficult to achieve the desired purposes To solve these problems, geophysicalchemical properties of radon were applied in the field of mining engineering, and radioactive measurement method was introduced to detect the dynamic evolution process of mining-induced fractures and its aquosity in overlying strata during underground coal mining [16,17,18,19,20]. The migration law of radon in UMS is the basis of radon detection on site, and the data of radon detection on surface is critical to the inverse analysis of the development characteristics of mining-induced fractures in overlying strata. Before carrying out the research work, the migration law of radon, especially in UMS, should be recognized, which is the aim of this study
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