Abstract
Roof water disaster is one of the most serious disasters in the process of coal mine safety mining in China. The thickness of modern comprehensive mechanized coal mining is large, which has a great impact on the roof aquifer, and the threat degree of water disaster is also increasing. Therefore, the evaluation of the water richness of the roof aquifer is an important work for coal mine water prevention and control. In order to systematically evaluate the water-rich property of an aquifer in a coal seam roof, this paper couples multisource geological information based on an analytic hierarchy process (AHP). The characteristics of the roof aquifer, hydrogeology, and structure are determined to be the main control factors of K2 limestone water richness evaluation. Under the main control factors, seven independent water richness evaluation indexes, including aquifer depth, aquifer thickness, borehole water level, borehole water consumption, faults, folds, and collapse columns, are divided, and a normalized water richness coupling evaluation model is constructed, which realizes the zoning and evaluation of a water-rich aquifer in a coal seam roof.
Highlights
Mine water disaster is a major threat to coal mine safety production, among which water inrush from the roof aquifer is one of the main types of coal mine water disaster
With the popularization of modern comprehensive mechanized coal mining, in order to make full use of coal resources to the maximum extent, the mining thickness of coal seam increases, which leads to the increase in the influence range of the caving zone and water-conducting fracture zone of the coal seam roof, the damage to the roof aquifer increases, and the threat degree of water disaster increases
Through comprehensive analysis of multisource geological information such as aquifer thickness, borehole water level, borehole water consumption, faults, folds, and collapse columns of K2 limestone in the direct roof aquifer of the no. 15 coal in the lower group of the coal seam in a mine field, analytic hierarchy process (AHP) is used to carry out multifactor coupling analysis, and a normalized evaluation model of water richness of the aquifer is established, realizing the zoning evaluation of water richness of the aquifer in the roof of the mine field
Summary
Mine water disaster is a major threat to coal mine safety production, among which water inrush from the roof aquifer is one of the main types of coal mine water disaster. The water richness of the aquifer is one of the important influencing factors of mine roof water disaster intensity [1,2,3,4] Before coal mining, it can systematically and accurately evaluate the water richness of the aquifer and predict the water inrush threat of the aquifer during mining, which will accurately guide the coal mine water prevention and control work and reduce the probability of roof water inrush and water damage. Qiu et al [14] put forward a comprehensive grey correlation method, fuzzy Delphi analytic hierarchy process, and geophysical exploration-combined evaluation and prediction method of Ordovician limestone water richness. Through comprehensive analysis of multisource geological information such as aquifer thickness, borehole water level, borehole water consumption, faults, folds, and collapse columns of K2 limestone in the direct roof aquifer of the no. 15 coal in the lower group of the coal seam in a mine field, AHP is used to carry out multifactor coupling analysis, and a normalized evaluation model of water richness of the aquifer is established, realizing the zoning evaluation of water richness of the aquifer in the roof of the mine field
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