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

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