Gong-kuang zidonghua (Aug 2022)
Risk assessment of water inrush from coal seam floor based on comprehensive weighting
Abstract
The existing risk assessment model of water inrush from coal seam floor has the problems of weak generalization capability and low accuracy for the working face with complex geological structures. In order to solve the above problems, a risk assessment model of water inrush from coal seam floor based on comprehensive weighting by analytic hierarchy process (AHP) and improved entropy weight method (IEW) is proposed. Based on the unascertained measure of single index, the comprehensive weight of each assessment index affecting water inrush from coal seam floor is given by the AHP-IEW comprehensive weighting method. A comprehensive risk assessment model of water inrush from coal seam floor is established. The unascertained measure value of each assessment index is calculated by using the model. Then according to the recognition criteria of confidence, the grade is determined and the assessment result is obtained. The feasibility of the model is verified by taking 1305 working face of Pandao Coal Industry Co., Ltd. as the research object. ① According to the actual situation of the coal mine, the mining depth, coal seam thickness, coal seam dip angle, aquifer water pressure, effective water barrier thickness, floor brittle rock thickness, fault fractal dimension and floor integrity that affect the floor water inrush risk are selected as the assessment indexes. The graded standard of floor water inrush risk is established. ② The single index measure functions are constructed to obtain the measure value of each assessment index. ③ The comprehensive weight of each assessment index is obtained by AHP-IEW comprehensive weighting method. ④ The comprehensive measure assessment vector is determined by combining the comprehensive weight and the unascertained measure matrix of the assessment index. ⑤ According to the comprehensive measure assessment vector, the investigation points in the study area of the coal mine are classified into risk grades. The results are compared with the field investigation results. The verification results show that compared with IEW assessment results, the prediction accuracy of risk assessment model of water inrush from coal seam floor based on AHP-IEW comprehensive weighting is higher. The assessment results are consistent with the actual investigation situation in the mining process of the working face.
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