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In order to study the water source identification in goaf of coal seam, taking Bayangaole coal mine as an example. Firstly, the water filling factors in the study area were analyzed,and the development height of the water-conducting fracture zone was determined through three methods. It was preliminarily judged that the Jurassic Yan’ an Formation and Zhiluo Formation aquifers were the direct water-filled aquifers in the goaf. Secondly, based on the data of aquifer and goaf water samples in the study area, the hydrochemical characteristics and hydrogen and oxygen isotope characteristics of water samples were analyzed in detail. The results show that the high mineralization, weak alkalinity, sodium sulfate type water, and the composition characteristics of hydrogen and oxygen isotopes of the goaf water in the research area are similar to those of the Jurassic aquifer water, and there are significant differences from the Quaternary and Cretaceous Zhidan Group. Finally, based on the above analysis, it can be confirmed that the water source of goaf water in Bayangaole coal mine was mainly the Jurassic Yan’ an Formation and Zhiluo Formation aquifers. The research results can provide a basis for the decision-making of water disaster prevention and control in similar coal mine goafs. [ABSTRACT FROM AUTHOR]

Mine water disaster is one of the geological disasters which seriously affect the safety production of coal mine. It is of great practical significance to analyze the occurrence regularity of mine water disaster for preventing water inrush accident and safe production. In this paper, the statistical analysis method is used to select the water disaster accidents occurred in the mining area of Tangshan Mine over the years, and combined with the mine hydrogeology and water filling conditions, the development law of water disaster is analyzed, and the time series, section and block, water source category, water channel and water inrush are deeply analyzed. The results show that the frequency of water inrush is decreasing. Water inrush points are mainly distributed in the middle of the well field. The main source of water is fissure water of sandstone in coal measure formation. The main water-conducting channel is water-conducting fissure; the water inrush is generally not large and the amount of water inrush soon attenuates Finally, combined with the actual mine production, a set of water prevention and control suggestions for Tangshan mine water disaster are put forward.

Taking 3200 working face of Tianzhu Coal Mine as an example, by analyzing the geological and hydrogeological conditions of the mine, the main water filling source and water filling channel of the mining face are determined. Combined with the measured results of previous surface movement deformation, the surface collapse caused by mining 3200 working face was predicted, so as to judge the degree of surface rivers affected by mining. The results show that the sandstone aquifer of the Jurassic Xinhe Formation, the aquifer of the weathered oxidation zone, the Quaternary loose layer and the surface river are the main filling water sources after the mining 3200 working face. The main water-filling channels are the water flowing fractured zone and the closed bad borehole. After mining, surface collapse and deformation, Jinsha River will pose a threat to the working face incision within the range of 0-300 m. Combined with the actual situation on the site, this paper proposes some protection measures of water prevention and control for the working face before and after the mining process.

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