Active fault crossing tunnel seismic reduction joint structure, tunnel structure and construction method

Abstract

The invention discloses an active fault crossing tunnel seismic reduction joint structure, a tunnel structure and a construction method. The technical solution of the active fault crossing tunnel seismic reduction joint structure comprises a rubber layer arranged in a seismic reduction joint, the rubber layer is longitudinally located between pre-construction section concrete and post-construction section concrete, the rubber layer is annularly located between a seismic reduction joint inner layer steel plate and a seismic reduction joint outer layer steel plate, one end of the seismic reduction joint inner layer steel plate is fixed with a pre-construction section inner layer steel plate, the other end is fixed with a post-construction section inner layer steel plate, one end of the seismic reduction joint outer layer steel plate is fixed with a pre-construction section outer layer steel plate, the other end is fixed with a post-construction section outer-layer steel plate, and reinforcing meshes are installed between the pre-construction section inner layer steel plate and the pre-construction section outer layer steel plate and between the post-construction section inner layer steel plate and the post-construction section outer layer steel plate correspondingly. According to the active fault crossing tunnel seismic reduction joint structure, the tunnel structure and the construction method, the influence of overlarge stress or overlarge deformation caused by faulting on the tunnel structure can be reduced, the toughness of the fault crossing part of the tunnel is effectively improved, and the safety and normal use of the tunnel are guaranteed.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a shock-absorbing joint structure of a tunnel spanning an active fault, a tunnel structure and a construction method. Background technique [0002] Crustal movement will cause large displacement and dislocation of the stratum rock mass along the fracture surface, and the resulting fault structure is called fault fracture zone, also called fault zone. As the demand for tunnel construction in my country continues to increase, the area continues to expand, and the engineering geological conditions are gradually becoming more complex. Due to the needs of engineering construction, the tunnel line will inevitably cross the active fault zone. Under the action of strong earthquakes, the rock mass often slides along the weak structural plane at the fault-crossing part of the tunnel, and excessive local stress or deformation may cause damage to the structure and anti-seepage sy...

AI Technical Summary

Problems solved by technology

[0004] In this technical field, setting damping joints in the area where the tunnel passes through the active fault zone can effectively reduce the stress of longitudinal seismic wave propagation, but at the same time it also makes the structural continuity worse, making the lining an independent unit, and because the rock mass in the fault fracture zone is loose The strength is low, and the lining cannot be given sufficient constraints, resulting in a relatively large absolute displacement of the tunnel under the earthquake, and in severe cases, permanent displacement deformation of the tunnel after the earthquake

At the same time, the joints in the tunnel deform greatly during the earthquake. Although it can effectively consume energy and absorb shocks, there is a common problem of damage to the anti-seepage system.

Images