Application of PFC2D numerical simulation analysis to determine reasonable slope angle of diagonal longwall supported by soft supports

Abstract

For diagonal longwall mining technology, soft scaffolding is used to exploit steep, medium-thick coal seams. Determining the appropriate pseudo-tilt angle of the diagonal longwall is an important key to calculating other parameters of the longwall. The steep slope angle of the longwall slant directly affects mining efficiency and safety during the mining process. Therefore, the article takes the diagonal longwall parameters of coal seam No. 6A of Vinacomin- Nam Mau Coal Company as the research object, using PFC2D numerical simulation software to simulate diagonal longwall mirrors with different slope angles. to evaluate the efficiency of coal mining and the influence of the longwall slope angle on the stability of the longwall mirror and the stability of the surrounding rock mass.