Anti-crack-type hinged tunnel used for crossing movable fault zone and application thereof

Abstract

The invention provides an anti-crack-type hinged tunnel used for crossing a movable fault zone and application thereof. The tunnel structure comprises a primary lining, section inner linings and annular flexible hinges between the adjacent section inner linings, and the annular flexible hinges are arranged at different intervals in a fault broken zone section and a fault broken zone affected section. Prestress steel bars are annularly arranged in the section inner linings of the tunnel, the annular flexible hinges are composed of corrugated steel pipes, rubber cushion layers, steel bar nets and flexible anti-crack concrete layers from the inner wall of a tunnel lining outwards. The corrugated steel pipes and the section inner linings are connected through the prestress steel bars. The tunnel waterproof effect is ensured through multi-layer waterproof measures, and PVC waterproof plates, geomembranes and back-attached-type water stop straps are included. An ultrahigh-toughness cement-based composite material is selected for the flexible anti-crack concrete layers and has good anti-permeability and durability. A diastrophism quantity generated by a movable fault is met, the safety ofthe tunnel crossing the movable fault is ensured, local damage to the annular flexible hinges is easy to rapidly repair, and the normal using function of the tunnel can be ensured after diastrophismof the movable fault.

Description

technical field [0001] The invention relates to a tunnel structure, in particular to a fracture-resistant hinged tunnel passing through an active fault zone and an application thereof. Background technique [0002] In recent decades, there have been many strong earthquakes around the world, causing serious damage to buildings and lifeline projects, especially tunnels, underground pipelines and other structures. For most earthquakes, fault dislocation is the main cause, such as the Chiji earthquake in Taiwan, China in 1999, the Wenchuan earthquake in Sichuan, China in 2008, and the Kumamoto earthquake in Japan in 2016. The stick-slip dislocation of active faults will induce earthquakes, and the energy will be released in the form of seismic waves, and the tunnels near the episeismic regions will suffer obvious earthquake damage. Relevant scholars’ statistics on the earthquake damage of tunnels in the near-field area show that if the tunnel passes through the seismogenic faul...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings that the existing tunnel anti-fracture measures cannot meet the large dislocation of faults, apply the good tensile and shear resistance properties of corrugated steel pipes to the tunnel structure, and provide a method that can maintain the large dislocation of active faults. The safety of the structure, the fracture-resistant hinged tunnel structure only produces repairable damage at the circumferential flexible hinge without affecting its normal use

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