Optical fiber grating-based surrounding rock internal strain monitoring method

A fiber grating and strain monitoring technology, applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of poor shear resistance and achieve the effects of poor shear resistance, accuracy, and survival rate

Inactive Publication Date: 2017-09-22
SHENYANG JIANZHU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the diameter of the bare fiber grating sensor is only 125 μm and its shear resistance is poor, how to keep the bare fiber grating sensor under tension and avoid shear brittle fracture during the process of embedding the bare fiber grating sensor in the surrounding rock is a problem that needs to be solved

Method used

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  • Optical fiber grating-based surrounding rock internal strain monitoring method
  • Optical fiber grating-based surrounding rock internal strain monitoring method
  • Optical fiber grating-based surrounding rock internal strain monitoring method

Examples

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Embodiment Construction

[0017] combined with Figure 1-3 An example of the device is described in detail as follows:

[0018] A method for monitoring internal strain of surrounding rock with optical fiber gratings, using a bare optical fiber grating pre-tensioning device to monitor the internal strain change of surrounding rock, so as to realize the monitoring of internal deformation characteristics and damage mechanism of surrounding rock.

[0019] The fiber grating pre-tensioning device includes a bare fiber grating sensor 1, a U-shaped stainless steel specimen 2, a metal gasket 5 and a packaged steel pipe 4;

[0020] A round hole is opened on the U-shaped frame at both ends of the U-shaped stainless steel test piece 2, and the two ends of the bare fiber grating sensor 1 are penetrated through the round hole, and the outer surface of the U-shaped frame is abutted with a packaged steel pipe 4, and the packaged steel tube 4 is sealed with a packaging glue 3. It is socketed on the bare fiber grating ...

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Abstract

The present invention relates to an optical fiber grating-based surrounding rock internal strain monitoring method. According to the method, a bare optical fiber grating sensor, an U-type stainless steel test piece, a metal gasket and an encapsulation steel pipe are adopted to form an optical fiber grating pre-tensioning device; compression strain in surrounding rock measured by the optical fiber grating pre-tensioning device is the decreased tension strain of the optical fiber grating sensor; and the optical fiber grating sensor is always in a tensioned state in a whole monitoring process, and therefore, the accuracy of a measurement result can be ensured, and the survival rate of the fiber grating sensor can be improved.

Description

technical field [0001] The invention relates to a method for monitoring the internal strain of surrounding rock with an optical fiber grating, and belongs to the technical field of optical fiber grating sensing and monitoring. Background technique [0002] The excavation of underground engineering destroys the original stress balance state, causes the internal stress redistribution of the surrounding rock, and induces geological disasters such as rock mass damage and deformation instability. Therefore, under the conditions of mining and excavation of the surrounding rock soil Strain monitoring is meaningful. In order to obtain the strain distribution law of the surrounding rock structure, strain gauges are usually arranged on the surface of the surrounding rock, but the strain gauges cannot monitor the internal strain of the surrounding rock. Fiber Bragg grating sensor can realize the monitoring of the internal strain of the surrounding rock due to its small size, high sens...

Claims

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Application Information

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IPC IPC(8): G01B11/16
Inventor 孙丽李闯张春巍苏中新徐自强
Owner SHENYANG JIANZHU UNIVERSITY
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