Establishment method of floating and slab staggering refined model of segment ring separated from shield tail

Abstract

The invention relates to a method for establishing a segment ring floating and slab staggering refined model for removing a shield tail, which comprises the following steps of: after determining the design information of a tunnel structure, establishing a refined numerical model which can consider the buoyancy borne by a segment, the thrust and direction of a shield tail jack and the shearing rigidity of a joint of adjacent segment rings; the self-made buoyancy test device is used for accurately testing the buoyancy borne by the duct part, and the floating condition of the duct part in the post-wall grouting wrapping state can be better reflected. Changes, caused by posture changes of the shield tunneling machine, of the thrust and direction of the shield tail jack on the segment ring areconsidered, and the longitudinal stress characteristics of the shield tail segment ring in the actual construction process of a tunnel and the influence on upward floating of segments are better reflected. By considering the shearing rigidity of the adjacent segment ring joints, the longitudinal characteristics of bending deformation and shearing deformation of the shield tail segment ring can bebetter reflected, displacement, slab staggering and additional internal force caused by floating of the shield tail segment ring can be more accurately determined, and a basis is provided for processcontrol of construction.

Description

technical field [0001] The invention relates to a method for establishing a refined model of a segment ring floating out of a shield tail and a staggered platform, and belongs to the technical field of underground engineering construction. Background technique [0002] With the rapid development of my country's national economy and the rapid expansion of my country's cities, urban traffic congestion has become a common problem in large cities. The use of large-volume subway transportation is an effective form of transportation organization for efficient operation in large cities, and the shield tunneling method has become the mainstream method of urban subway construction due to its small impact on urban traffic, safe, efficient and fast excavation. [0003] The construction process of segment assembly at the tail of the shield machine will inevitably lead to an annular gap between the assembled segment ring and the formation—shield tail gap. The grouting behind the shield ...

AI Technical Summary

Problems solved by technology

[0004] At present, there are two problems in solving this problem: 1) How to determine the buoyancy force of the slurry on the segment ring and how to change it with time is unclear; 2) In order to reduce the misplacement of the segment ring, a A variety of positioning bolts, positioning concave-convex tenon and other forms, their contribution to the shear stiffness of the ring-to-segment joint is currently unclear

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