Simulation Study on Spatial Form of the Suspended Roof Structure of Working Face in Shallow Coal Seam

Longwall fully comprehensive mechanized mining is mainly used for the working faces of shallow coal seam with large height, which usually have a suspended roof at face end. The overhang end leads to stress concentration, affects safe face. In this paper, we use 15210 (overhanging area 50~70 m2) Zhangjiamao mine as study background, physical simulation, numerical calculation and theoretical analysis, spatial morphologies changes in structure ends are obtained, increase from bottom top, forming step-laminated structures. caving interval about two times period weighting interval, tailgate smaller than headgate. distribution shear principal field face-end region arc-shaped, plastic zone shows that collapse ceiling has obvious hysteresis. According simplified analysis Marcus plate, when layers stepped curved triangular plates increase, length on solid side also increases, consistent results simulation calculations. formation mechanism provides research foundation control roofs found further improves theory safety areas.