"Three soft" thick coal seam with large section, soft surrounding rock and large deformation, which are prone to damage and destabilization in a short period of time during mining, even with roofing accidents, resulting in casualties and economic losses. In order to solve the problem of "three soft" thick coal seam recovery mining, "three soft" thick coal seam was taken as a special background, with theoretical analysis, based on "self-stabilizing hidden arch", the theoretical method was used to analyze the structural stability of the surrounding rock, the height of "self-stabilizing invisible arch", and the deformation characteristics and control mechanism of the surrounding rock in the roadway of "three soft" thick coal seam were analyzed, so as to provide a basis for setting the technical indexes of the roadway support for the recovery mining
