Anti-seismic structure with seismic active fault zone arranged on surface of shield segment and implementation method

Abstract

The invention provides an anti-seismic structure with an earthquake active fault zone arranged on the surface of a shield segment, the anti-seismic structure comprises a plurality of shield segments located in the earthquake active fault zone, the inner surface of each shield segment is provided with a plurality of prestressed steel bars, and each prestressed steel bar extends along the length direction of a shield tunnel. The two ends, in the length direction of the shield tunnel, of each prestressed steel bar are fixed to a shield segment. The invention further provides an implementation method of the anti-seismic structure with the seismic active fault zone arranged on the surface of the shield segment. The tensile property of the prestressed steel bars is utilized, the prestressed steel bars are arranged on the inner sides of the shield tunnel segments to form the prestressed steel bar rings, longitudinal connection of the segment rings in the active fault section is enhanced, friction force between the segment rings is increased, and the longitudinal overall rigidity of the segment rings in the active fault influence section is improved; and impact force generated by fault dislocation under the action of strong earthquakes can be effectively resisted, and the overall anti-seismic capacity of the shield tunnel is improved.

Description

technical field [0001] The invention relates to the field of tunnel engineering, in particular to an anti-seismic structure and an implementation method in which a seismically active fault zone is arranged on the surface of a shield segment. Background technique [0002] With the rapid development of my country's economy and the continuous progress of construction equipment technology, large-scale underwater tunnel projects have entered a period of rapid development. Shield tunneling has been widely used because of its safety, speed, technology and other characteristics, and the construction conditions have become more and more complex. Because of the low rigidity of the lining and the large deformation allowance of the waterproof gasket at the joint, the shield tunnel structure does not generally have special seismic measures in the seismic intensity area below 7 degrees. However, in recent years, with the construction of more and more shield tunnels, some tunnels are inevi...

AI Technical Summary

Problems solved by technology

Ordinary bolted connections cannot meet the safety and durability requirements of shield tunnels with active faults under strong earthquakes in complex geology and high-intensity earthquake areas, and special anti-seismic measures must be adopted

[0003] At present, the anti-seismic methods and measures of shield tunnels at home and abroad are mainly aimed at weak strata, that is, to strengthen the foundation of the soft strata along the line and reduce the seismic response of shield tunnels (mainly to reduce the seismic displacement of shield tunnels). The obvious disadvantage of the method and measures is that the seismic response (mainly the seismic displacement of the shield tunnel) is difficult to completely eliminate. When the seismic response is too large, the tunnel structure cannot meet the requirements of safety and durability, and this method requires a large amount of engineering work. High cost, complex construction process, difficult to guarantee quality

Images