The objective of this study is to investigate the effect of longwall mining on the stability of the gate roadway in an underground coal mine. The PT Gerbang Daya Mandiri (GDM) underground coal mine in Indonesia, with weak rocks, was chosen as a representative study site. To achieve the research objective, the finite diffrence code software FLAC3D was used for numerical simulations. The longwall mining of several panel and chain pillar widths at different depths was simulated and discussed. According to the simulation results, the influence of coal panel extraction on gate roadway stability is determined by the panel and chain pillar widths. The largest effect occurs when the large panel width and small barrier pillar width are used, whereas the smallest effect occurs when the narrow panel width and large chain pillar width are used. To ensure the stability of the gate roadway while increasing coal recovery, the suitable panel and chain pillar widths are proposed for each mining depth in this underground coal mine
📖 افتح في inklap 🔗 DOI 📮 اطلب بحثاً