Secondary lining flexible joint device and construction method for tunnel crossing active faults

Abstract

The invention discloses a secondary lining flexible joint device and a construction method for tunnels crossing active faults, including a plurality of high-strength springs, limit devices and flexible sleeves; The front and rear secondary lining segments are welded together with the longitudinal steel bars in the secondary lining, and the axial direction of the spring is parallel to the axial direction of the tunnel; the limiting device is composed of a limiting groove and a concrete tenon , the limit groove and the concrete tenon are respectively located in the two secondary lining segments, and the limit groove and the concrete tenon work together, the flexible sleeve is installed on the outer edge of the hole of the high-strength spring and the limit device, and the flexible sleeve Can be used as a stress member.

Description

technical field [0001] The invention relates to the field of tunnel engineering, in particular to a secondary lining flexible joint device and construction method suitable for tunnels crossing active faults. Background technique [0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] my country has become one of the countries with the largest tunnel construction scale and the most difficult construction in the world, and more and more tunnels have been built. Most of the tunnels that have been built in our country or are in the planning, design or construction stage pass through the fault fracture zone. Engineering experience in recent decades shows that tunnels crossing faults, especially active faults, will face a series of problems such as surrounding rock instability and landslides, water and mud inrush, and shear displacement of tunnel structures. The optimization of the...

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Problems solved by technology

[0005] At present, a design idea to prevent the excessive displacement of the lining structure is to reduce the displacement of the tunnel lining structure by setting a shock-absorbing buffer layer, thereby ensuring the safety of the lining structure, but the inventors found that this method would cause overbreak of the tunnel section, overbreak The amount is designed according to the estimated amount of fault displacement, which is difficult to estimate; at the same time, over-excavation also causes construction difficulty, an increase in engineering quantity, and a prolongation of the construction period, which may cause other safety problems (such as stress concentration, inappropriate Uniform settlement, collapse, etc.), how to optimize the tunnel lining structure during construction and reduce the damage of active faults to the tunnel is a technical problem that needs to be solved urgently

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