A device and method for measuring large strain of surrounding rock based on fiber grating displacement meter string

A fiber grating and displacement meter technology, which is applied to measurement devices, optical devices, instruments, etc., can solve the problems of easy failure of monitoring instruments and inability to achieve monitoring purposes, and achieve the effects of avoiding temperature effects, economical and practical, and easy to operate.

Inactive Publication Date: 2017-12-01
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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  • A device and method for measuring large strain of surrounding rock based on fiber grating displacement meter string
  • A device and method for measuring large strain of surrounding rock based on fiber grating displacement meter string
  • A device and method for measuring large strain of surrounding rock based on fiber 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 device and method for measuring the large strain of surrounding rock based on a string of optical fiber grating displacement gauges. The device includes sequentially connected displacement gauges; A displacement sensing mechanism and a signal conversion mechanism; 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, and then converts the strain amount according to the displacement; the signal conversion mechanism includes a display screen The method includes using the device to carry out the following steps: providing installation holes on the surrounding rock along the measurement direction of the surrounding rock strain; assembling a corresponding number of displacement meters according to the length in the detection direction; The device for measuring the large strain of the surrounding rock is installed in the installation hole; the grout is poured into the installation hole, and the grout hardens and the displacement sensing mechanism is integrated with the surrounding rock. The invention has the beneficial effects of continuously and accurately measuring the large strain of the surrounding rock.

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 Patents(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胡旭阳黄和平毛艳平孙建会姜龙朱赵辉许源
Owner CHINA THREE GORGES CORPORATION
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