A Shield Tunnel Stratum Stability and Long-term Health Monitoring System for Tunnel Structures

Abstract

The invention discloses a monitoring system for formation stability and tunnel structure long-term health of a shield tunnel. The system comprises a vibrating wire type or fiber grating type earth pressure gauge, an osmotic pressure gauge, a steel stress gauge, a strain gauge, vibrating wire type surface crack meters, vibrating wire type liquid level sensors, a crack meter and data acquisition units. The vibrating wire type or fiber grating type earth pressure gauge is embedded on the outer surface of a duct piece with the pressure surface facing a soil body. The osmotic pressure gauge is embedded in a tunnel lining and used for monitoring the osmotic pressure of the tunnel lining. The steel stress gauge is arranged in a concrete segment. The strain gauge is embedded in the concrete segment and used for monitoring the strain of concrete. The two ends of the vibrating wire type surface crack meters are separately arranged on adjacent tunnel concrete segments by universal joints, and thevibrating wire type surface crack meters are used for monitoring the opening degree of the adjacent concrete segments. The vibrating wire type liquid level sensors measure the change of elevations ofa measuring point and a reference point. The crack meter is embedded in the concrete segment and used for measuring the crack condition of the tunnel segments. The data acquisition units are used forcollecting sensor signals in various geotechnical engineering safety monitoring projects.

Description

technical field [0001] The present disclosure generally relates to the field of geotechnical engineering monitoring, and specifically relates to a system for monitoring strata stability and long-term health of tunnel structures in deformation sensitive areas of subway shield tunnels under strong loads. Background technique [0002] During the construction process of the subway shield tunnel passing under the high-speed rail, the deformation control of the ground is extremely demanding. There are multiple risk sources in the high-speed railway project under the small-radius stacked tunnel, which poses a severe challenge to the stability control of the ground and the optimization of the construction process. At the same time, monitoring measurement and long-term health assessment of supporting structures are indispensable and important components in the information construction of modern subway tunnels. [0003] The ground deformation of the radius shield tunnel and the safet...

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Problems solved by technology

[0004] At present, it is usually only for a specific monitoring quantity, such as segment load and segment deformation, and rarely conducts comprehensive monitoring and evaluation for segments, and it is difficult to achieve real-time monitoring and automatic collection

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