Active fault spanning aseismic structure and construction method thereof

Abstract

The invention relates to an active fault spanning aseismic structure and a construction method thereof. A damping ring is arranged in the surrounding rock of the lining structure at a fault fracture zone, the lining structure is located in the inner round of the damping ring, and a certain spacing distance exists between the lining structure and the damping ring; left, right and upper sides of thetunnel cross section at the fault fracture zone are expanded relative to the tunnel cross section of the stable section; the lining structure penetrating through the fault fracture zone is of a vertical segmental structure, and two adjacent lining segments are connected through a folded flexible joint in the deformation joint. The damping ring is adopted to weaken the earthquake action, and partsof seismic wave energy is absorbed to consume and reduce the earthquake energy; the whole lining structure is converted to the lining segment from, flexible chaining connection capable of bearing large deformability between the two adjacent lining segments is adopted, so that the staggered displacement is mainly absorbed by the flexible chaining connection, and the earthquake resistance and damping performance of the tunnel structure is improved. According to the structure, earthquake resistance and diastrophism resistance are combined, and the whole safety of a tunnel can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to an anti-seismic structure spanning an active fault and a construction method thereof. Background technique [0002] With the implementation of my country's western development strategy, on the one hand, a large number of roads, railways and hydropower tunnels have been built one after another; on the other hand, controlled by the earth's plate tectonic movement, the Qinghai-Tibet Plateau is uplifting. Under this geodynamic background and geological structure framework, in the process of infrastructure construction in the western region, it is inevitable to encounter the problem of building tunnels near active faults and high-intensity earthquake areas. There are tens of thousands of railway tunnels in my country, and nearly a thousand of them are located in strong earthquake areas. It is increasingly important to ensure the safety of tunnels and underground engineerin...

AI Technical Summary

Problems solved by technology

The existing problems are: the anti-seismic measures are too single, and the rubber pad is close to the tunnel structure, which cannot achieve a good anti-seismic effect and has little effect; when an earthquake occurs, although the rubber pad can play a buffering role, it does not consume much energy. Energy effect, cannot dissipate and attenuate seismic energy

In addition, the use of this structure cannot change the stiffness and deformation capacity of the tunnel structure, and cannot reduce the damage and destruction of the structure when an earthquake occurs. It has poor adaptability to ground deformation and has basically no effect on resisting fault dislocation.

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