Research on Anti-Leakage Measures for Fully Mechanized Mining Faces in Gently Inclined Thin Coal Seams

Abstract

Aiming at the rock fragment leakage caused by small dip angle of coal seam, limited mining height, and poor stability of roof and floor in gently inclined thin coal seams of fully mechanized mining faces, this study systematically analyzed the causes of leakage and proposed comprehensive prevention measures based on the engineering background of the 31101 working face in Lu Ning Coal Industry. The research revealed that the leakage primarily resulted from stress imbalance between the upper and lower parts of the working face, misalignment between the end support and transition support (1.0m), and concentrated pressure at the tail end. By optimizing roadway layout (avoiding overlying coal pillars), ensuring the flatness of roof and floor, enhancing the initial support force of hydraulic supports, strictly controlling mining height, and designing a novel anti-leakage device (including components such as sliding channels, sliders, and high-elasticity rubber plates), the adaptability issues of traditional rock-blocking devices in thin coal seams were effectively resolved. Field tests demonstrated that the leakage rate decreased from 95% to 10% after improvements, significantly improving mining efficiency and ensuring personnel safety. The findings provide technical support for the safe and efficient mining of gently inclined thin coal seams, offering significant engineering application value.