Shield ultimate support pressure calculation method and device considering non-full cabin degree

The invention discloses a shield ultimate support pressure calculation method and device considering the degree of insufficient cabin filling, and the method comprises the following steps: S1, obtaining and determining the current shield excavation diameter, the soil covering thickness and the initial parameters of a stratum; s2, the parameters are substituted into a limit support pressure calculation formula, and a soil body weight influence factor N gamma, a soil body cohesion influence factor Nc and a support medium influence factor Nk are calculated; and S3, through a'Graded-Ehhanced 'optimization algorithm, setting a user-defined set and the user-defined precision TolX and Tolfum of the user-defined set, and solving the ultimate support pressure. According to the method, the shield ultimate support pressure can be calculated through the shield size parameter, the soil covering thickness, the stratum parameter, the non-full cabin degree coefficient and the support medium gradient coefficient in the shield