Structure final settlement amount algorithm considering special process of immersed tube tunnel

The invention discloses a structure final settlement amount algorithm considering a special process of an immersed tube tunnel. The algorithm comprises the following steps: 1, determining a basic forminfluence coefficient K1; 2, determining the structural rigidity and the influence coefficient K2 of a joint (including a buried section joint); 3, calculating the sand cushion settlement amount S1 considering the influences of over-excavation, back-silting and the like; 4, calculating the original foundation settlement amount S2 considering excavation loosening and springback under the sand cushion layer; and 5, calculating the final precipitation amount S = K1K2 (S1 + S2). The algorithm considers the process and structural characteristics of the immersed tube tunnel, including multiple important factors such as underwater overexcavation, excavation loosening influence, back silting, structural rigidity, joints, foundation resilience and the like which have influence on final settlement,so that the calculation r