Abstract The stability of the roof plates of coal roads in Huainan Mining Area is classified by two indexes，the intensity of tectonic stress and the complexity of occurrence structure of roof layers. The classification reflects that the composite roof plates are liable to develop layer separation in the mining area. The coal roads of Class IV，V are further divided into four types，stable，fragmentized，layer-separated，and layer-separated fragmentized coal roads. The idea of pretension supporting and the technique of serial pretension supporting are proposed for the control of layer separation，which effectively resolve the long-standing problem of coal road supporting.
1Guo S，Stankus J.Control mechanism of a tensioned bolt system in the laminated roof with a large horizontal stress[A]. In：16th Int. Conf. on Ground Control in Mining[C]. Morgantown，West Virginia：[s. n.]，1997
2004, Vol. 23 
