In order to reveal the deformation mechanism of surrounding rock in the three-soft coal seam with GSER(GSER), through physical simulation experiment, the roof strata fracture evolution under the three conditions of no roof cutting general support, top cutting high-strength support, and roof cutting public support is simulated, the roof structures mechanical structure model of roof cutting GSER in the three-soft coal seam is established. The research shows that based on the overburden characteristics in the three-soft coal seam, the roof-cut technology cuts off the stress transmission, and high-strength support is adept in the roadway. Therefore, the roof can form a "short cantilever beam-voussoir beam" structure. With no roof cutting general support, the average approach distance and the floor are 1000-1200mm. The moderate approach distance of the two sides is 600-700mm. Under the roof cutting general support, the middle approach distance of the roadway roof and the floor is 800-900mm. The intermediate approach distance of the two sides is 400-500mm. Under the roof cutting high-strength support conditions, the roadway roof and floor's average approach distance is 200-300mm, and the intermediate approach distance of the two sides is 200-300mm. Under the roof cutting combined support, the middle approach distance of the roadway roof and the floor is 50-100mm. The moderate approach distance of the two sides is 100-200mm. Therefore, the combined high-strength support can better control the severe deformation of the surrounding rock of the GSER in the three-soft coal seam. The remaining roadway can satisfy secondary reuse with no repair.
three-soft coal seam; GSER by cutting roof; short cantilever beam-voussoir beam; combined hydraulic support; high-strength support
Wei B., Huang Q., Ca J. Research on Roof Structure Model and Reasonable Support of GSER by Cutting Roof in Three-Soft Coal Seam. Int. J. Geo-Energy, 2023, 1(1), doi:10.58531/ijge10310003
