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

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...

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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

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