Abstract
With the deep mining of North China-type coalfield, the threat of mixed water source is increasingly serious, and water inrush accidents occur from time to time. Identifying the water inrush dynamic of limestone-mixed water source in high geothermal coal mine is difficult. This paper constructs a radioisotope distribution model of deep groundwater and obtains the dynamic data of radium and radon on the basis of the decay law of radionuclides and the principle of water balance and mass conservation. The radium–radon dating model is used to obtain the age of groundwater. Combined with the data of uranium and temperature, a dynamic identification model of multilayer limestone-mixed water source in coal seam floor is established by using a multielement mixed mass balance calculation method (M3). The relationship between the age of mixed water source and the mixing proportion of temperature and the contribution of recharge end member can be interpreted. The age of deep groundwater is negative correlation to the temperature. The temporal and spatial changes in mixed water sources and the response mechanism of radium–radon are described. Research results provide a new method to identify the source of water gushing in high geothermal coal mine, which is of great importance to improve coal mine safety production.
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