Coal-rock interface stability measuring device with fiber grating composite structure

A fiber grating and composite structure technology, applied in the direction of measuring device, using optical device, measuring force, etc., can solve the problems of complex geology of bolt distribution, cross-sensitivity between axial stress and surrounding stress, etc.

Active Publication Date: 2020-12-04
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Anchor bolts are widely used in geotechnical engineering fields such as coal roadway support, slope reinforcement, tunnel support, etc., and their force monitoring is of great significance for improv

Method used

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  • Coal-rock interface stability measuring device with fiber grating composite structure
  • Coal-rock interface stability measuring device with fiber grating composite structure
  • Coal-rock interface stability measuring device with fiber grating composite structure

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Embodiment Construction

[0016] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0017] refer to figure 1 , the present invention provides a coal-rock interface stability measuring device with a fiber grating composite structure, comprising:

[0018] Axial pressure gauge 1, the axial pressure gauge 1 is a cylindrical box body, one end of the bottom surface of one side is fixedly connected to one end of an optical fiber support mechanism 2, the optical fiber support mechanism 2 is a columnar body, and four optical fiber grooves 10 for accommodating optical fibers are symmetrically arranged on the outer edge , the interior of the four fiber grooves 10 accommodates the first optical fiber F1, the second optical fiber F2, the third optical fiber F3 and the fourth optical fiber F4; the first optical fibe...

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Abstract

The invention relates to a coal-rock interface stability measuring device with a fiber grating composite structure. The coal-rock interface stability measuring device comprises an axial pressure gauge, an anchor rod, fiber grating strain sensors, fiber grating strain gauges, an external optical cable protective shell, an optical cable, a photoelectric detector and a fiber grating demodulator, wherein the axial pressure gauge comprises a pressure elastic sheet, the fiber grating strain gauges and a pressure transfer column; when the pressure elastic sheet receives axial pressure, the pressure is transferred to the fiber grating strain gauges through the pressure transfer column by the pressure elastic sheet; four fiber grating strain gauges connected in series are connected to a first optical fiber channel of the anchor rod in series. Four optical fibers are arranged around the anchor rod, each optical fiber is connected to seven fiber grating strain sensors to sense surrounding strain,the four optical fibers and the external optical cable are connected in the external optical cable protective shell through flanges, a pressure signal is input into the fiber grating demodulator through the optical cable and the photoelectric detector for demodulation, so that the coal-rock interface stability is monitored in real time.

Description

technical field [0001] The invention relates to the technical field of fiber grating sensing, in particular to a coal-rock interface stability measuring device with a fiber grating composite structure. Background technique [0002] Fiber grating is essentially a passive filter formed by periodically modulating the refractive index of the fiber core. Fiber Bragg grating has the following advantages: strong anti-electromagnetic interference ability, the fiber will not be disturbed by electromagnetic waves during transmission; small size, fiber Bragg grating is compatible with optical fiber; long transmission distance, high precision, fiber Bragg grating measurement accuracy is not affected by light intensity , has the characteristics of easy networking measurement and integration, so it has been widely used in the field of optical fiber communication and sensing. [0003] As an important part of my country's energy production and supply system strategy, coal resources have ma...

Claims

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Application Information

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IPC IPC(8): E21D21/00G01B11/16G01L1/24
CPCE21D21/0026E21D21/0093G01B11/18G01L1/242
Inventor 靳宝全张帅兵白清高妍张红娟王宇
Owner TAIYUAN UNIV OF TECH
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