Device and Method for Measuring Bedrock Axial Deformation Using Fiber Bragg Grating Displacement Sensor

Abstract

The invention discloses a device and a method for utilizing a fiber bragg grating displacement sensor to measure axial deformation of bedrock. The device comprises fiber bragg grating displacement meters, an optical cable and a signal conversion mechanism, wherein the fiber bragg grating displacement meters and the signal conversion mechanism are connected by the optical cable; the fiber bragg grating displacement meters are sequentially connected to detect the axial deformation of the bedrock; the fiber bragg grating displacement meters are connected with the optical cable to receive a signal in the optical cable and convert into readable information. The device and the method have the beneficial effects that the problem of difficulty in measuring the axial deformation of the bedrock is solved based on the fiber bragg grating displacement meters, and the temperature influence is avoided by the fiber bragg grating displacement meters with temperature compensation functions; the different fiber bragg grating displacement meters are sequentially connected into a string, so as to continuously measure the axial deformation of underground cave surrounding rock and the bedrock; according to the different designs of mounting holes, the axial deformation of the bedrock along different directions can be measured.

Description

technical field [0001] The invention relates to the technical field of geological surveying, in particular to a device and method for measuring the axial deformation of bedrock by using a fiber grating displacement sensor. Background technique [0002] In hydropower engineering, the stress distribution inside the rock will change due to the excavation of the rock or the construction of the engineering building (structure), which will cause the rock to undergo compression or rebound deformation. This kind of deformation is very unfavorable to engineering safety and stability, and its magnitude needs to be measured and engineering measures should be taken to eliminate it. [0003] At present, there are few instruments for monitoring the axial deformation of bedrock in underground caverns of hydropower projects. Generally, sliding micrometers are used to monitor axial displacement. Sliding micrometers are imported instruments for manual measurement, and no domestic manufacturer...

AI Technical Summary

Problems solved by technology

During the measurement process, it is necessary to use a 1.5-2.0m long measuring rod to lower the sliding micrometer measuring head. The operation requires 3-5 people to operate, and the electrical measurement (automatic collection) cannot be realized.

At the same time, the high price of imported instruments has pushed up the project cost, making it difficult to be widely used in projects

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