A system and method for large-scale and high-precision online monitoring of shield tunnel misalignment

Abstract

The invention discloses a system capable of achieving large-scale high-precision on-line monitoring of faulting of slab ends of a shield tunnel. The system comprises multiple deformation sensing devices which are communicated with a distributed optical fiber demodulation instrument through an optical fiber sensing circuit, and the distributed optical fiber demodulation instrument is communicated with a computer; each deformation sensing device comprises a deformation beam body and a sensing optical fiber, one end of each deformation beam body is fixedly connected to a shield tunnel duct piece on one side of a joint, the other end of the deformation beam body is fixedly connected to a shield tunnel duct piece on the one side of the joint in an oriented mode, the sensing optical fiber is arranged along the central axes of the upper surface and the lower surface of the deformation beam body, and free sensing optical fibers are formed in the central axes; the optical fiber sensing circuit is communicated with the distributed optical fiber demodulation instrument by being connected with the sensing optical fibers of the multiple deformation sensing devices in series to form an optical circuit, and then the optical fiber sensing circuit is communicated with the computer. According to the system capable of achieving the large-scale high-precision on-line monitoring of faulting of the slab ends of the shield tunnel, the structure is simple, and the low-cost high-precision on-line monitoring of faulting of the slab ends of the large-scale duct pieces of the shield tunnel is achieved.

Description

technical field [0001] The invention relates to a system and a method for monitoring the dislocation of a shield tunnel, in particular to a system and a method for large-scale and high-precision online monitoring of a dislocation of a shield tunnel, and belongs to the technical field of tunnel engineering. Background technique [0002] Shield tunnels have the characteristics of short construction time and low impact on the environment. They have become the main construction form of traffic tunnels such as subways, rivers, and seas. However, the lining of shield tunnels is spliced ​​by prefabricated reinforced concrete segments through high-strength bolts. There are joints between the segments. Under the action of external load, the joints are prone to shear deformation, which makes the segments form a staggered platform. On the one hand, the bolts generate greater shear stress, and on the other On the one hand, it will bring hidden dangers of waterproofing, easily cause bolt...

AI Technical Summary

Problems solved by technology

[0002] Shield tunnels have the characteristics of short construction time and low impact on the environment. They have become the main construction form of traffic tunnels such as subways, rivers, and seas. However, the lining of shield tunnels is spliced ​​by prefabricated reinforced concrete segments through high-strength bolts. There are joints between the segments. Under the action of external load, the joints are prone to shear deformation, which makes the segments form a staggered platform. On the one hand, the bolts generate greater shear stress, and on the other On the one hand, it will bring hidden dangers of waterproofing, easily cause bolt corrosion, and bring potential safety hazards. In severe cases, it will also affect the clearance of the tunnel and threaten traffic safety. Therefore, the monitoring of segment mislocation plays an important role in tunnel safety.

[0003] In actual engineering, due to the large number of segment seams, the existing monitoring or detection techniques cannot realize long-term online monitoring of large-scale seams. System and method

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