A rigidity model for the segment rings of shieldbored tunnels is established on basis of different diseases and different segment joint positions of the shieldbored tunnels, so as to study the segment ring rigidity of the shieldbored tunnels. Calculation results show that: 1) The theoretical results coincide with the actual rigidity distribution of the segment rings and have high accuracy; 2) The rigidity model can exactly reveal the rigidity distribution of the segment rings, the segment ring rigidity model established is proper and rational, and the establishment of the segment ring rigidity model is helpful to future researches on the redistribution of the internal force of segment rings after disease occurs to the shieldbored tunnels and it has laid a good foundation for followup studies.