Shield tunnel segment joint stress in-situ measurement method

Abstract

The invention relates to a shield tunnel segment inner force monitoring method, in particular, a joint shield tunnel segment joint stress in-situ measurement method, and belongs to the crossing field of tunnel engineering field monitoring and construction technology. According to the method of the invention, a fiber grating pressure sensor is inserted into the interior of each segment, so that the sensors and the segments are connected together to form an integrated body to jointly bear a force; when the joint pressure of the segments is measured, a sheet rubber made of the same material with a rubber sealing strip of the corresponding shield segment is pasted on the outer surface of the corresponding fiber grating pressure sensor inserted into the segment, so that the correctness of load transfer can be ensured; the contact pressure of the rubber sealing strip at the joint of the shield segments is measured in real time, so that the stress condition of the joint of the shield segments in a tunnel construction and operation period can be determined, and the mechanical behavior and waterproof sealing performance of the shield segments can be analyzed, and therefore, the work condition of a shield liner joint can be evaluated. The joint shield tunnel segment joint stress in-situ measurement method of the invention has the advantages of high practicability and high effectiveness. With the method adopted, the stress state of the joint between the segments can be monitored in real time in situ, and the problem of difficulty in monitoring the inner force of the joint of the shield segments in the prior art can be solved.

Description

technical field [0001] The invention belongs to the intersecting field of on-site monitoring and construction technology of tunnel engineering, and relates to on-site monitoring of stress on joints of shield tunneling segments and evaluation of airtightness and mechanical behavior of segment joints. Background technique [0002] In the past two decades, my country's urban rail transit has achieved unprecedented development, and it is still in the period of large-scale construction. The shield tunneling method is the main construction method used in the construction of subway tunnels. In shield tunneling, the unique and complex structure of the segment joints makes the stress analysis extremely complicated. The mechanical behavior and waterproof sealing of the segment joints are the key to the long-term stability of the tunnel segment lining structure. With the construction of a large number of shield tunnels, the sealing performance of shield segment joints has an increasing...

AI Technical Summary

Problems solved by technology

Since the seam pressure is difficult to measure after the segments are looped, and the sealing performance of the seam is difficult to detect, it is difficult to evaluate it quantitatively and effectively

The existing shield segment health monitoring mainly focuses on the force and deformation of the shield segment and the water and soil pressure on the outside of the shield segment. At present, there is no method that can directly measure the joint pressure of the segment on site. and installation

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