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

Abstract

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 result of the final settlement amount is more accurate.

Description

technical field [0001] The invention relates to the technical field of final settlement calculation in immersed tube tunnels, in particular to a structure final settlement calculation considering the special technology of immersed tube tunnels. Background technique [0002] Immersed tube tunnel is an underwater tunnel built through the processes of prefabrication in dock, towing and floating, sinking and docking, foundation treatment, backfilling and covering. The top cover is shallow, the tunnel length is short, and the connection with the roads on both sides of the water area is more flexible, which can greatly save land resources in the central urban area. It is one of the main methods for cities to build underwater tunnels in inland rivers. More than 80% of the immersed tube tunnels eliminate the harmful gaps at the bottom of the tube joint and the bottom of the foundation trench by filling the sand cushion after the tube joint is placed. The weight of the concrete back...

AI Technical Summary

Problems solved by technology

The weight of the concrete backfill in the tunnel and the gravitational force of the gravel backfill protective layer outside the tunnel cause the sand filling cushion and the original foundation to compress, thus causing the structure to settle

[0003] At present, the calculation method of the final settlement of the immersed tube tunnel structure does not consider the influence of the special process of the immersed tube, and there is a large deviation between the calculated value and the measured data, which cannot effectively guide the design to take corresponding settlement control measures, resulting in uneven settlement of each pipe section of the tunnel , leading to water leakage at the joints between pipe joints, affecting the safety of tunnel operation

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