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happen more frequently. For the safety of coal mining, horizontal directional drilling and grouting techniques have been implemented to detect and plug the fractures and conduits that deliver high-pressure groundwater to coal mine. Taking the grouting engineering performed at Xingdong coal mine at 980\u2009m below sea level as an example, we collected the data of grouting quantity, the loss of drilling fluid, gamma value, water temperature, average water absorption, distance between grouting loss points, water pressure on coal seam floor, and aquifuge thickness at 90 boreholes in the mine to conduct grey relational analysis, first. The analysis showed that the grouting quantity was highly correlated with all other factors. Subsequently, grey system evaluation was used to evaluate the risk of water inrush from the coal seam floor. The results of risk analysis illustrated that three water inrushes from Ordovician limestone occurred in mining face 2127, 2125, and 2222 in the study area were all located in the area with a risk score higher than 65. Through grouting, the identified cracks were effectively blocked and waterproof layers beneath the coal seam floors were constructed to reduce the threat of water inrush. By comparing the risk assessment results with three water inrush cases before grouting operation, we found that water inrush areas were consistent with the area of higher risk.<\/jats:p>","DOI":"10.1155\/2020\/8205370","type":"journal-article","created":{"date-parts":[[2020,2,27]],"date-time":"2020-02-27T23:32:10Z","timestamp":1582846330000},"page":"1-12","source":"Crossref","is-referenced-by-count":11,"title":["Risk Assessments of Water Inrush from Coal Seam Floor during Deep Mining Using a Data Fusion Approach Based on Grey System Theory"],"prefix":"10.1155","volume":"2020","author":[{"given":"Yaru","family":"Guo","sequence":"first","affiliation":[{"name":"School of Geographic and Environmental Sciences, Tianjin Normal University, Tianjin 300387, China"},{"name":"Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin 300387, 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