Research on the Width of Protective Coal Pillars Left in the Main Roadway of Daning Coal Mine
In order to determine the reasonable retention width of protective coal pillars in the southern roadway of the sixth mining area of Daning Coal Mine,based on the actual geological conditions of Daning Coal Mine,this paper explores the theoretical retention width of protective coal pillars in the roadway based on the"three underground"mining specifications and elastic-plastic limit equilibrium theory.Numerical simulation software is used to analyze the distribution characteristics of rock fractures and stress distribution of protective coal pillars with different widths in the roadway.Research has shown that when the width of the protective coal pillars in the coal roadway and rock roadway of the southern part of the sixth mining area is not less than 30 m and 34 m respectively,the roadway has good stability during the mining process of the working face,which can ensure the safe and efficient advancement of the working face.
coal minemain roadwayprotect the width of the coal pillarnumerical simulation