Building method for secondary lining of tunnel penetrating through active fault

Abstract

The invention relates to a building method for a secondary lining of a tunnel penetrating through an active fault. The building method comprises the steps that firstly, the radial size of an inner contour of the tunnel is enlarged in an active fault crushed zone, the area, at a distance of 0m-L1m with the active fault crushed zone, of an upper plate and the area, at a distance of 0m-L2m with the active fault crushed zone, of a lower plate, and the L1 and L2 both are not smaller than 20; and when the secondary lining is built, reinforcing bar distribution is conducted on annular main bars of the free face side at intervals of 2m-6m along the direction of a route. According to a tunnel structure built through the method, the section height of the tunnel is increased. When fault dislocation occurs, the remaining section clearance amount of the tunnel structure is still not smaller than the clearance standard value of the tunnel section, the tunnel traffic opening requirement can be met, and the situation that the tunnel is waste, or an original tunnel structure is dismantled and constructed again is avoided. Reinforcing bar distribution is conducted on the annular main bars of the free face side, the integrity of the secondary lining structure is effectively guaranteed, and the traffic safety guarantee of the tunnel is improved greatly.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a construction method for a secondary lining of a tunnel crossing an active fault. Background technique [0002] The construction of the subway inevitably encounters various complex engineering geological environments, and there are many active fault zones in my country. Through data research, active fault dislocation is often accompanied by earthquakes, that is, the impact of active faults on engineering structures is mainly manifested as dislocation damage and earthquake damage. Research data show that when active fault dislocation occurs, the dislocation effect will affect the tunnel. The damage caused by the structure plays a dominant role, and the earthquake action has less influence. The main reason is that the dislocation failure will cause the forced displacement of the strata and the permanent deformation of the tunnel lining structure. The impact of this sud...

AI Technical Summary

Problems solved by technology

It poses a huge threat to the driving safety of tunnels passing through active faults. For example, after the fault dislocation occurs, the clearance of the tunnel does not meet the conditions for opening to traffic, leading to the abandonment of the tunnel or the demolition of the original tunnel structure for re-construction, and may even have devastating consequences.

[0003] In addition, the current anti-dislocation measures for tunnel structures under active faults are mostly "resistance", but blindly increasing the thickness of the lining cannot completely resist the powerful force of fault dislocation, and lining dislocations usually occur in actual engineering , lining inclination, vault falling blocks and other serious consequences

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