Surrounding rock stress on-line monitoring system and method based on fiber bragg grating borehole stress meter

A technology of drilling stress gauge and fiber grating, which is applied in the measurement of the change force of the optical properties of the material when it is stressed, can solve the problems of low reliability, poor monitoring accuracy, and non-moisture-proof, so as to avoid electromagnetic interference. The effect of interference, ensuring site safety, and simple equipment installation

Active Publication Date: 2015-06-24
CHINA UNIV OF MINING & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Technical problem: In order to overcome the deficiencies in the prior art, the present invention provides an online monitoring system and method for surrounding rock stress based on a fiber grating drilling stress gauge, which solves the existing problems of mine pressure monitoring: 1. Susceptibility to electromagnetic interference and external Environmental interference and poor monitoring accuracy; 2. Not moisture-proof, low reliability, low monitoring efficiency, and short service life of sensing elements; 3. Remote monitoring cannot be carried out, and real-time online monitoring and long-term monitoring cannot be realized

Method used

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  • Surrounding rock stress on-line monitoring system and method based on fiber bragg grating borehole stress meter
  • Surrounding rock stress on-line monitoring system and method based on fiber bragg grating borehole stress meter
  • Surrounding rock stress on-line monitoring system and method based on fiber bragg grating borehole stress meter

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Embodiment 1

[0036] Embodiment 1: An online monitoring of surrounding rock stress based on a fiber grating drilling stress gauge includes a system and a method,

[0037] The system includes: a fiber grating drilling stress gauge 1, an optical fiber connector 2, an optical fiber 3, a mine optical cable 4, a fiber grating demodulator 5 and a computer 6; an optical fiber is connected to the tail of the fiber grating drilling stress gauge 1 Connector 2, the optical fiber connector 2 is connected to the input end of the fiber grating demodulator 5 through the optical fiber 3 and the mine optical cable 4, and the output end of the fiber grating demodulator 5 is connected to the computer 6; the fiber grating drilling stress Meter 1 includes 4 groups of fiber gratings, and each group of fiber gratings is composed of an axial strain grating, a transverse strain grating and a temperature grating.

[0038] The described method is realized through the following steps:

[0039] A. Use a drilling machi...

Embodiment 2

[0059] Embodiment 2: The fiber grating drilling stress gauge 1 includes 10 groups of fiber gratings. Other embodiment 1 is the same.

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Abstract

The invention relates to a surrounding rock stress on-line monitoring system and method based on a fiber bragg grating borehole stress meter. A plurality of measurement points are arranged on a surrounding rock, the fiber bragg grating borehole stress meter is installed in a surrounding rock wall drill hole, an optical fiber connector is connected with an optical fiber, and the optical fiber is connected to a mining optical cable, is then directly connected to the ground, and is connected with a fiber bragg grating modulator; an optical signal is modulated to a digital signal by the fiber bragg grating modulator, the digital signal is transmitted to a computer, is monitored in real time and is analyzed and processed, and a surrounding rock axial stress and transverse stress analyzing and processing method is provided under the temperature compensation condition according to grating stress characteristics. The surrounding rock stress on-line monitoring system and method have the advantages that equipment is easy to install, long in service life and suitable for popularization and use; power supply is not needed underground, electrical signals and electronic devices do not exist, and therefore the field is safe; because all-optical measurement and optical fiber transmission are adopted, monitoring precision is greatly improved, and effect of electromagnetic interference can be effectively avoided under complex and poor environment; surrounding rock stress monitoring results can be provided in time and guiding of field production and scientific research work is facilitated.

Description

technical field [0001] The invention relates to an online stress monitoring method, in particular to an online monitoring method for surrounding rock stress based on an optical fiber grating drilling stress gauge. Background technique [0002] In recent years, with the continuous improvement of mining technology and the continuous increase of mining depth, the disasters caused by the emergence of mine pressure have become more and more serious, such as roof caving, roadway deformation, and impact mine pressure. The industry has caused huge losses, seriously affecting the safety of employees and mine production. Therefore, as one of the important guarantees for mine safety production, surrounding rock stress monitoring has been paid more and more attention, and the requirements for monitoring accuracy, reliability and online monitoring capabilities are also getting higher and higher. If an advanced online monitoring and early warning system for surrounding rock stress is est...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/24
Inventor 方新秋刘晓宁梁敏富
Owner CHINA UNIV OF MINING & TECH
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