Development of Water Flowing Fractured Zone Caused by Fully Mechanized Top Coal Caving in Xin'an Coal Mine

Taking Xin'an coal mine as an example, through empirical formula, regional analogy, theory analysis and analog simulation experiment, predicted the high of water flowing fractured zone under the condition of fully mechanized top coal caving, used monitoring system to measure the height of water flowing fractured zone on site, confirmed the rationality of the theoretical analysis. Through the specially experimental box, a simulation material of top coal caving has been developed to simulate the characteristics of water flowing fractured zone under fully mechanized caving mining condition: The caving zone develops rapidly, and the overall growth is approximately linear. The development of fractured zone showed a staged linear growth. It is found that both the empirical formula calculation and the analogical prediction result include the measured results. The prediction is basically accurate, but the accuracy is not high and the error is relatively large. Only the theoretical analysis combined with the theory of relevant rock pressure and the specific formation conditions of coal mine is accurate.