Multi-source information evaluation of mud and sand inrush disaster during the mining of deep-buried coal seam
(2.Xi’an Research Institute Co., Ltd., China Coal Technology and Engineering Group Corp., Xi’an, China 710077)
(3.Shaanxi Key Lab of Mine Water Hazard Prevention and Control, Xi’an, China 710077)
【Abstract】The mud–sand inrush during the mining of a deep-buried coal seam is caused by the disintegration of the mudstone in the coal seam roof when mudstone meets water. It is a comprehensive disaster due to concentrated underground mud–sand inrush under mine pressure. The occurrence of such a disaster is affected by many factors, such as aquifers, mine pressure, and geological structure. This paper took the Zhaojin coal mine in Huanglong coalfield as the study area and discussed the mechanism of the disaster. Then, the main controlling factors were identified, including water yield property of Luohe Formation aquifer, the distance between coal seam and Luohe Formation aquifer, the thickness of conglomerate in Yijun Formation, the thickness of variegated mudstone above the coal seam, the distance between coal roof and variegated mudstone, fault density, distribution of folds, and coal-seam mining thickness. The analytic hierarchy process was used to determine the weights of the main controlling factors, and the mathematical model for the risk assessment of the mud–sand inrush disaster in the coal seam roof was constructed. Then the thematic maps of the main controlling factors were drawn. Based on the information fusion method, the factors were superimposed, and finally, the disaster integrated zoning method of multi-source information fusion was formed. The research results show that the risk of disaster occurrence in ZF202 working face is high, which is in conformity to the occurrence of “4·25” major disaster, indicating that the risk assessment model is reasonable and that the zoning results can be used to guide mining of Zhaojin coal mine and prevention and control of mud–sand inrush disasters.
【Keywords】 deep-buried coal seam; mud–sand inrush; multi-source information fusion; main controlling factors; evaluation method; Jurassic coalfield; Zhaojin coal mine;
(Translated by HAN R)
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