Secondary lining for preventing stick slip diastrophism of active fault spanning tunnel and construction method of secondary lining

Abstract

The invention discloses a secondary lining for preventing stick slip diastrophism of an active fault spanning tunnel and a construction method of the secondary lining. The secondary lining is of a main structure that the part outside a support vertical rack (7) in a reinforced concrete layer is taken as an opening layer (1); the part inside the support vertical rack (7) is taken as an inner layer (3); the thickness ratio of an inner layer (3) to the opening layer (1) is (1-1.8):1; longitudinal hollow tubes (2) are inserted into the opening layer (1); the ratio of the diameters of the hollow tubes (2) to the thickness of the opening layer (1) is (0.5-0.7):1; the hollow tubes (2) are arranged in the annular direction of the opening layer (1) at equal intervals; a radial grouting tube (4) is pre-buried between the inner wall of the inner layer (3) and the hollow tubes (2). By adopting the secondary lining, fault stick slip diastrophism can be prevented, the damage caused by fault diastrophism to a tunnel can be reduced, the seismic capacity of the tunnel can be effectively increased, and damage caused by fault stick slip diastrophism can be prevented; moreover, the secondary lining can be rapidly repaired after being damaged, the tunnel can be rapidly repaired, and the repairing cost is low.

Description

technical field [0001] The invention relates to a secondary lining for anti-stick-slip dislocation of tunnels across active faults and its construction method Background technique [0002] With the acceleration of urbanization and the construction of a large number of tunnel projects, it is inevitable to encounter the problem of tunnel structures crossing active faults. Active faults refer to those faults that were newly born or had inherited movement and displacement in modern or historical periods, and may regenerate or continue to move and displace in the near future. The occurrence of earthquakes is directly related to active faults. [0003] Stick-slip dislocation of active faults is a regional geological disaster characterized by fault structures, and it is the main factor causing severe damage to tunnel structures across faults caused by earthquakes. The stick-slip dislocation of active faults with sudden large deformation will cause permanent deformation of the fau...

AI Technical Summary

Problems solved by technology

However, there are two deficiencies in the lining: one is that due to the setting of foam concrete, it needs to be poured in two times, the construction efficiency is significantly reduced, and the construction period is increased; the other is that after the internal structure of the lining is damaged due to fault dislocation, it is necessary It is very difficult to repair and reinforce the damaged parts after drilling and grouting

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