Research on Abnormal Overpressure Warning for Fully Mechanized Coal Mining Face Based on GRA-TOPSIS
To prevent the significant manifestation of mining pressure on the working face during the mining period,including issues such as pressure frames induced by abnormal pressure in certain areas,an evaluation model for abnormal pressure on the working face has been established through mathematical and physical analysis.This model aims to provide prevention and early warning for abnormal pressures in mines.The main findings of the research are as follows:(1)By analyzing the situation of abnormal pressure in domestic mines,factors such as depth of burial,the ratio of mining height to coal thickness,coal seam dip angle,thickness of the immediate roof,thickness of the main roof,advancement speed,and dip length were selected as key factors for the evaluation of pressure on the working face,thus constructing an evaluation system for abnormal pressure.(2)Utilizing the entropy weight method to process mine area data to determine the weight values of each factor,sorting the scores through weighte matrix using TOPSIS method,and improving the TOPSIS method through grey relational analysis to optimize and obtain the grey relational weight matrix,an evaluation model for abnormal pressure on the working face was constructed.(3)The model proposed was applied in the Chahasu coal mine,where the evaluation results were found to be ideal.
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