Drainage and drainage method for long-distance reverse-slope tunnels

The invention discloses a drainage and a drainage method for long-distance reverse-slope tunnels. The drainage comprises a guide gutter, a settlement grotto and a pump station grotto, the settlement grotto and the pump station grotto are respectively arranged at the inflow end and the outflow end, the horizontal positions of the grotto floors of both the settlement grotto and the pump station grotto are lower than the floor of a tunnel, the guide gutter is arranged on the floor of the tunnel, the side of the guide gutter is connected with the inner edges of the settlement grotto and the pump station grotto, and a water pump is arranged in the pump station grotto. The invention has the beneficial effects that water can be constantly drained, pipeline blockage caused by accumulated sewage is prevented, moreover, the backflow problem of long-distance reverse-slope drainage is effectively solved, the efficiency of tunnel construction is increased, meanwhile, the sealing property of drainage pipes is enhanced by a