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Fiber bragg grating (FBG) testing device and testing method for rock three-dimensional stress state

A technology of optical fiber grating and three-dimensional stress, which is applied in the direction of measuring the change force of its optical properties when the material is stressed, can solve the problems of not realizing the three-dimensional stress test, and achieve mine safety monitoring and prediction. Good for disasters, high test accuracy

Inactive Publication Date: 2011-09-07
HENAN POLYTECHNIC UNIV
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Problems solved by technology

However, no matter what method is used, due to the axial sensitivity of fiber gratings, the test of three-dimensional stress has not been realized.

Method used

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  • Fiber bragg grating (FBG) testing device and testing method for rock three-dimensional stress state
  • Fiber bragg grating (FBG) testing device and testing method for rock three-dimensional stress state
  • Fiber bragg grating (FBG) testing device and testing method for rock three-dimensional stress state

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Embodiment Construction

[0025] Such as figure 1 , figure 2 As shown, a test device for a rock three-dimensional stress state of the present invention includes a fiber grating network demodulator and a data processing module composed of a computer, as well as a fiber grating sensing structure, wherein the fiber grating sensing structure consists of three fiber grating sensors 21 . Glue is pasted on the three-dimensional direction of three adjacent surfaces of cube module 1; The signal output ends of three fiber grating sensors 21, 22, 23 are all connected with the signal input ends of the fiber grating network demodulator, and the fiber grating network demodulator The signal output terminal of the regulator is connected with the signal input terminal of the computer through the data line. The data processing module composed of the fiber grating network demodulator and computer is in the prior art, wherein the fiber grating network demodulator includes a photoelectric conversion module, a data acqui...

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Abstract

The invention discloses a fiber bragg grating (FBG) testing device and a testing method for rock three-dimensional stress state. The testing device comprises a data processing module consisting of an FBG network demodulator and a computer, three FBG sensors and a substrate for mounting the FBG sensors; the substrate can be deformed with the deformation of rocks; the three FBG sensors are respectively fixed in three-dimensional directions on the surface of the substrate; and the signal output ends of the three FBG sensors are connected with the signal input ends of the FBG network demodulator. The invention can measure the deformation amount of microstrain, so responses can be made in time before rock masses are damaged; the high-precision measurement of three-dimensional stress in rocks can be realized, so that the long-term and effective monitoring for large project rock masses can be realized, and disasters are prevented.

Description

technical field [0001] The invention relates to the field of rock stress testing, in particular to a testing device and a testing method for a rock three-dimensional stress state. Background technique [0002] my country is one of the countries with frequent natural disasters in the world. Disasters such as coal mine accidents, mud-rock flows and landslides occur frequently, and the economic losses caused are difficult to estimate. And many serious vicious accidents are caused by ignorance of rock mass stress state and internal defects. It has become one of the nine key mechanical issues that have emerged in the development of mechanical science in China in the new century to identify in time the representation of mechanical signals from microscopic to macroscopic in rocks, and to issue early warnings before the arrival of dangerous damage. Under the action of external load, the process of initiation, growth, expansion and convergence of defects in the rock leads to the fin...

Claims

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Application Information

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IPC IPC(8): G01L1/24
Inventor 魏世明柴敬许力
Owner HENAN POLYTECHNIC UNIV
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