Method for constructing dislocation-resistant tunnel secondary lining passing through active fault

Abstract

Provided is a method for constructing dislocation-resistant tunnel secondary lining passing through an active fault. The method comprise the steps that A, the segment length of the secondary lining constructed on the active fault crushed zone and in the areas, away from the active fault crushed zone by 20-100 m, of a hanging wall and a heading wall is half to one third that of the secondary lining outside the active fault; and B, seven high-strength tension-compression spring pipes of a crosswise deformation joint are connected with the inner walls of adjacent segments of the secondary lining of the active fault crushed zone through bolts, and the seven high-strength tension-compression spring pipes are located at the positions of an arch crown, a left arch waist, a right arch waist, a left arch springing, a right arch springing, a left wall foot and a right wall foot correspondingly. According to the secondary lining constructed by the method, the dislocation energy of the active fault can be well absorbed, the dislocation-resistant effect is good, the safety of the integral structure of a tunnel can be better guaranteed, and rapid emergency rehabilitation, first-aid repairing and restoring and reinforcing of the tunnel structure after disasters are facilitated.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering, in particular to the technical field of construction of secondary lining structures of subway tunnels. Background technique [0002] The construction of the subway will inevitably encounter various complex engineering geological environments, such as active fault zones (active faults). Through data investigation, active fault dislocation is often accompanied by earthquakes. Therefore, the impact of active faults on engineering structures is mainly manifested as dislocation damage and earthquake damage. Some research data show that: when the active fault dislocation occurs, the damage caused by the dislocation to the tunnel structure plays a dominant role, and the impact of the earthquake is relatively small. 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 ...

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Problems solved by technology

At present, in the actual engineering design and construction, basically relying on engineering experience, most of them focus on "hard resistance", and blindly increase the structural rigidity by thickening the lining and adding reinforcement, which requires a lot of financial, material and manpower; and head-to-head The anti-staggering effect is limited, and it cannot guarantee the structural safety very well.

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