Support Control Design of Mining Roadway under Goaf of Close-Distance Coal Seam

Abstract

Coal resources have always been the focus of attention in the field of sustainable development. Based on the problem of surrounding rock control in close-distance coal seams, first, a mechanical model of floor failure was established based on the 29204 working face in Dongqu Mine; the failure mechanism of the floor was revealed by the zero displacement line, and a method to judge the occurrence state of the roof in the lower coal seam was put forward. Furthermore, by FLAC3D numerical simulation software, the mechanical model is verified, and the optimal support parameters are optimized, and the optimal water–cement ratio and grouting pressure are determined to be 0.6 and 3 MPa respectively. The application shows that the roof displacement is reduced by about 73.48% compared with the control group. Compared with the control group, the cable stress decreased by about 50.68%, and the application effect is remarkable. The research results provide an effective solution to ensure the sustainable development of coal resources and disaster prevention.

Non-uniform failure and differential pressure relief technology of roadway under irregular goafs in deep close-distance coal seams

“…Zhang et al 16 , 17 elucidated the characteristics of the impact of residual coal pillar in close-distance coal seams on mine pressure, obtained the failure depth and mechanism in goaf floor, and revealed the evolution laws of stress before and after pressure relief in panel of close-distance coal seams. Lu and Ni 18 constructed a mechanical model of roadway floor rock in close-distance coal seams, and obtained reasonable support parameters, grouting material ratio, and grouting pressure for roadway surrounding rock. Aghababaei et al 19 used a rock engineering system to study the floor deformation mechanisms at longwall face in a coal mine and conducted in-depth risk analysis and prediction.…”