Design method for support ribs of ballast slipping plate of cutter head of full face rock tunnel boring machine

The invention belongs to the field of design methods for a cutter head structure of a tunneling machine and particularly relates to a design method for support ribs of a ballast slipping plate of a cutter head of a full face rock tunnel boring machine. The design method takes the overall technical performance requirement of the cutter head, the construction requirement, and the requirement of the cutter head for quickly discharging ballast into consideration while ensuring maximal strength and rigidity of the cutter head. According to the design method, four L-shaped support ribs from first to fourth are welded at the part of the ballast slipping plate on the rear panel of the cutter head, and each L-shaped support rib has an L-shaped cross section and comprises an arc part and a straight plate part. Due to the adoption of the design method, given that the rock ballast can be smoothly discharged under given conditions, the cutter head is improved in strength, rigidity and stability, so that the cutter head of the tunneling machine has prolonged tunneling service life, the tunneling machine vibration is alleviated, the noise is reduced, and the engineering economic loss in is also reduced.