Gas axial isolation belt in tunnel gas accumulation area and construction method thereof

The invention discloses a gas axial isolation belt in a tunnel gas accumulation area. The gas axial isolation belt comprises zone grouting belts and gas isolation rings. The zone grouting belts and the gas isolation rings are arranged on the outer sides of the head and tail positions of a tunnel. The tunnel is excavated on a coal seam with gas accumulation, the initial position of the tunnel is constructed with high gas support, the tail end position of the tunnel is constructed with coal penetrating section anti-seepage support, and the coal penetrating section anti-seepage support is constructed at a coal seam penetrating section of the tunnel. A coal seam on the outer side of the coal penetrating section anti-seepage support is arranged as the gas accumulation area. The gas isolation rings and the zone grouting zones are constructed on the outer sides of the head and tail positions of the tunnel, and gas is isolated by the interaction of the gas isolation rings and the zone groutingbelts to prevent the gas