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Large surrounding rock stress measuring device and method based on fiber bragg grating displacement meter string

A technology of fiber gratings and displacement meters, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of failure to achieve monitoring purposes and easy failure of monitoring instruments, and achieve the effects of avoiding temperature influence, economical and practical, and simple operation

Inactive Publication Date: 2015-06-17
CHINA THREE GORGES CORPORATION +1
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Problems solved by technology

Although the strain gauge is used to measure the strain of the surrounding rock with high precision, the monitoring instrument is prone to failure and cannot achieve the purpose of monitoring

Method used

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  • Large surrounding rock stress measuring device and method based on fiber bragg grating displacement meter string
  • Large surrounding rock stress measuring device and method based on fiber bragg grating displacement meter string
  • Large surrounding rock stress measuring device and method based on fiber bragg grating displacement meter string

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Embodiment Construction

[0045] A device for measuring large strains of surrounding rock based on a string of fiber grating displacement meters, comprising sequentially connected displacement meters;

[0046] The displacement meter includes a displacement sensing mechanism and a signal conversion mechanism connected by a signal transmission mechanism;

[0047] The displacement sensing mechanism converts the displacement of the surrounding rock at its installation position into a signal that can be transmitted through the signal transmission mechanism;

[0048] The signal conversion mechanism includes a display screen, and the signal conversion mechanism converts the signal from the signal transmission mechanism into readable information.

[0049] The displacement gauge is a fiber grating displacement gauge, and the signal transmission mechanism is an optical cable 3, and the optical cable 3 is arranged along the axial direction of the device for measuring the large strain of surrounding rock based on ...

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Abstract

The invention discloses a large surrounding rock stress measuring device and method based on a fiber bragg grating displacement meter string. The device comprises displacement meters connected in sequence. The displacement meters comprise displacement sensing mechanisms and signal converting mechanisms, wherein the displacement mechanisms and the signal converting mechanisms are connected through signal transmission mechanisms. The displacement sensing mechanisms convert the displacement of the surrounding rock at the position where the displacement sensing mechanisms are mounted into signals capable of being transmitted through the signal transmission mechanisms, and then the dependent variable is converted according to the displacement. The signal converting mechanisms comprises display screens. The method includes the following steps that a mounting hole is formed in the surrounding rock in the surrounding rock stress measuring direction; corresponding numbers of displacement meters are assembled according to the length in the detection direction; the assembled device based on the fiber bragg grating displacement meter string and used for measuring the large surrounding rock stress is assembled into the mounting hole; the mounting hole is filled with slurry, the slurry is hardened, and the displacement sensing mechanisms and the surrounding rock are combined into a whole. The device and method have the advantages of being capable of continuously and accurately measuring the large surrounding rock stress.

Description

technical field [0001] The invention relates to the technical field of geological surveying, in particular to a device and method for measuring large strains of surrounding rocks based on an optical fiber grating displacement meter string. Background technique [0002] At present, the monitoring of surrounding rock strain in underground caverns of hydropower projects is mainly realized by embedding unidirectional strain gauges or fiber Bragg grating strain gauges. The measuring range of the two kinds of strain gauges is generally 3000με (of which the tensile strain is 2500με, and the compressive strain is 500με), and the strain gauge with a gauge length of 250mm can measure a maximum deformation of only 0.75mm. However, the surrounding rock of the underground cavern is affected by the excavation and blasting during construction, and the deformation of some areas after support can reach 10-20mm or even greater. Although strain gauges are used to measure the strain of surroun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
Inventor 任大春樊义林王万顺李秀文汤国强段杭上官瑾于胜利柯传芳孙建会姜龙许源
Owner CHINA THREE GORGES CORPORATION
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