Research conclusions: ( 1) The tunnel invert should be constructed to make the lining into closure condition as soon as possible during tunneling in the weak weathered granite rock section． ( 2) It is necessary for the CD method followed by invert excavation section and making the lining into a closure condition as early as possible． ( 3) Because of the possibility for the hydraulic connection between Wenxing tunnel and the reservoir，water samples should be collected in time to make a necessary chemistry and isotopic analysis to determine where the water seepage and gushing are from． ( 4) The secondary lining should be applied as soon as possible during tunneling in weak rock of the fracture zone． If necessary， a special anti water pressure composite lining design should be made． ( 5) Once the hydraulic connection between the tunnel and reservoir was confirmed and the deformation and mechanical condition of the tunnel in fault fracture zone waspoor． The cross － hole for vehicle should be kept away from the weak point，it is suitable to change forward or backward 10 meters to the weak weathered granite section．