Coal mine goaf top plate strain monitoring system and method based on fiber bragg grating sensing

Abstract

The invention discloses a coal mine goaf top plate strain monitoring system and method based on fiber bragg grating sensing, and belongs to a coal mine top plate strain monitoring system and method. The system comprises a fiber bragg grating demodulation instrument, a monitoring computer, a mining transmission optical cable, a communication optical fiber and tail optical fibers, wherein a plurality of monitoring points are arranged in a goaf top plate; each monitoring point is provided with one fiber bragg grating strain sensor; the sensors in the monitoring points are connected in parallel through the tail optical fibers which access the mining transmission optical cable through optical fibers; the mining transmission optical cable is connected to an input end of the fiber bragg grating demodulation instrument on the ground; an output end of the fiber bragg grating demodulation instrument is connected with the monitoring computer; and the monitoring computer constitutes a fiber bragg grating strain monitoring system of coal mine goaf top plate all-fiber communication. The coal mine goaf top plate strain monitoring system and method based on the fiber bragg grating sensing have the advantages that all-optical measurement and optical fiber transmission are adopted, so that the influence of electromagnetic interference is avoided; equipment does not require power supply, so that essential safety of working face production is ensured; and real-time monitoring and analysis of coal mine goaf top plate strain are realized.

Description

technical field [0001] The invention relates to a coal mine roof strain monitoring system and method, in particular to a coal mine goaf roof strain monitoring device and method based on optical fiber grating sensing. Background technique [0002] Among the roof accidents in the mining industry, the accidents caused by the large-scale collapse of the stope roof account for a large proportion. In the process of coal mining, the roof of the goaf in some mining areas is relatively hard and is often not easy to collapse. Therefore, after the working face of these mining areas is pushed through, a large area of ​​suspended roof will appear in the goaf, and some goafs have a small area of ​​suspended roof. It can range from thousands of square meters to tens of thousands or even hundreds of thousands of square meters. [0003] Due to the large-area roof overhang, the stress concentration on the roof of the gob is caused. When the intensity of the concentrated stress exceeds the st...

AI Technical Summary

Problems solved by technology

The shock wave formed by the air wave can not only cause harm to the personnel in the stope, but can even lift tens of tons of mining equipment tens of meters away, seriously damaging the mining machinery and equipment

The occurrence of rock formation fracture and collapse in the goaf has caused huge casualties and property losses to the mine

[0004] However, the development of the existing goaf rock mass monitoring technology is very lagging behind, and the traditional stope rock mass deformation monitoring technology mainly relies on manual intermittent observation and data, which is completely unable to adapt to the rock mass deformation monitoring of the goaf

Remote monitoring cannot be carried out on the monitoring, and real-time online monitoring and long-term monitoring cannot be realized

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