Numerical calculation of mine pressure in deep immerged tunnel of protection layer mining

The mining face in the Twelve Mine belong to Pingdingshan Colliery Group Co. LTD is immerged in the depth of 1015m between 1130m. Extraction Scheme of Protective Seams was used as the key technology. So the law of mine pressure in the tunnel below should be further researched. To the actual actual conditions, the three-dimensional model was build using the FLAC3D. The mine pressure in the tunnel below was calculated. From the result of calculation it was showed that the mine pressure of the tunnel below decreased after mining. But before and while mining the mine pressure increased and the tunnel was difficult to support. The tunnel on the side of mining area was under the long term load of mining and the pressure in the surround rock was very large. To the different variation patterns, the pertinence solutions should be taken to maintain the stability of the tunnels.